Cydnidae

M, Cristina Mayorga & P, Luis Cervantes, 2009, Two new species of Amnestus from Guatemala, with new records for some other Guatemalan burrower bugs (Hemiptera: Heteroptera: Cydnidae), Zootaxa 2311, pp. 19-37 : 34-36

Key to the burrower bugs ( Cydnidae ) of Guatemala

1. Clavus meeting beyond scutellum and forming a commissure almost as long as scutellum; anterior third of peritreme modify apically into a ring, lobe or band, and is wider than base of peritreme and more or less shiny; specimens less than 4.5 mm long ................................................................................................................................. ( Amnestinae ) 2

1’. Clavus not meeting beyond scutellum, and not forming a commissure; anterior third of peritreme, without a differentiated structure, sometimes with a subapical projection in form of a hook or wing; specimens more than 5 mm long ................................................................................................................................................................................... 11

2. Jugum with five marginal pegs..................................................................................................................................... 3

2’. Jugum with four marginal pegs .................................................................................................................................. 10

3. Tylus longer than jugum, usually as long as wide ....................................................................................................... 4

3’. Tylus equal or not longer than jugum .......................................................................................................................... 5

4. Prosternal carinae longer than high, ventral margin feebly convex ....................................... Amnestus . uhleri Distant

4´. Prosternal carinae longer than high, ventral margin straight .................................................... Amnestus zacki sp. nov.

5. Pronotal umbones distinctly, closely punctuate over full surface.................................... Amnestus championi Distant

5´. Pronotal umbones polished, mostly impunctate .......................................................................................................... 6

6. Prosternal carinae (in profile) lobulate, vertical anteriorly............................... Amnestus subferrugineus (Westwood)

6´. Prosternal carinae rounded or longer than high, not vertical anteriorly ....................................................................... 7

7. Anterior lobe of pronotum with disperse punctures, fore femur with internal margin serrated, with a simple spine ... .................................................................................................................................................... Amnestus stali Distant

7´. Anterior lobe of pronotum with dense punctures, fore femur not as above ................................................................. 8

8. General coloration black; pronotum, scutellum, and corium thickly and coarsely punctuate ....................................... ............................................................................................................................................. Amnestus signoreti Distant

8´. General coloration pale brown; pronotum, scutellum, and corium with punctures not thickly and coarsely ............ 9

9. Fore tibia flattened with four robust spines on external margin, and one on its apex, ventrally with a small spine on middle area ( Fig. 8 ); corium pale yellow ............................................................................... Amnestus henryi sp. nov.

9´. Fore tibia slightly flattened with four spines on external margin, and one on its apex, ventrally without a spine; corium creamy white .......................................................................................................... Amnestus bergrothi Distant

10. Subapical ventral spine of posterior femur in males, more than one-third length of tibia. Last sternite in females with medially flattened, glabrous area delimiting laterally by partial or complete, obtuse, longitudinal carinae ................. ................................................................................................................................................ Amnestus pusillus Uhler

10´. Subapical ventral spine of posterior femur in males, shorter than vertical height of femur. Males fore tibia without spines or angulation on ventral margin. Last sternite in females without medially flattened, glabrous area ................ ..................................................................................................................................................... Amnestus pusio (Stål)

11. Anterior tibia strongly cultrate, much produced beyond tarsal insertion so that tarsus appears to arise at middle of tibial length ................................................................................................................................... (Cephalocteinae) 12

11´. Anterior tibia not cultrate, tarsus arising at or very near apex of tibia .................................................... ( Cydninae ) 13

12. Tylus distinctly surpassing apices of juga and broadly expanded anterior to them; posterior lobe of pronotum impunctate................................................................................................................ Scaptocoris divergens Froeschner

12´. Tylus not surpassing apices of juga; posterior lobe of pronotum with distinct, fine punctures ..................................... ......................................................................................................................................... Scaptocoris talpa Champion

13. Anterior part of osteolar peritreme modified apically into a short process, which is wider than basal part of peritreme and more or less polished; osteolar opening usually visible ventrally at base of terminal process ................................ ........................................................................................................................................ Ectinopus muticus Froeschner

13´. Anterior part of osteolar peritreme without enlarged, differentiated apical structure; osteolar opening posteriorly on peritreme, not visible ventrally .................................................................................................................................. 14

14. Pronotum, anteriorly with a deep line, well defined and running transversely through anterior margin (this line usu- ally without punctures) ........................................................................................................................... ( Pangaeus ) 15

14’. Pronotum anteriorly without a deep line, although usually with a row of punctures in the same area ..................... 20

15. Mesopleuran evaporatorium extended along posterior margin of sclerite into posterolateral angle ........................ 16

15’. Mesopleuran evaporatorium limitated, separated from posterolateral angle and posterior margin by a shiny area. 19

16. Posterior tibia with distinct, subbasal angulation, with one to three spines on posteroventral margin before apex. 17

16’. Posterior tibia ventrally without subbasal angulation, posteroventral margin with four or more spines before apex .. .................................................................................................................................................................................. 18

17. Apex of genital capsule with a broad, deep, U-shaped emargination ........................... Pangaeus aethiops (Fabricius)

17´. Apex of genital capsule not emarginated, sometimes gently sinuate ................................. Pangaeus docilis (Walker)

18. Costa with two setigerous punctures ....................................................................................... Pangaeus moestus (Stål)

18´. Costa with one setigerous puncture ........................................................................................... Pangaeus piceatus Stål

19. Jugum with a setigerous puncture immediately anterior to eye; dorsum of head strongly convex, usually with trans- verse rugae well defined .................................................................................................... Pangaeus rugiceps Horvath

19’. Jugum with three to five setigerous submarginal punctures; head surface neither strongly convex or with rugae ...... .............................................................................................................................................. Pangaeus bilineatus (Say)

20. Posterior tibia conspicuously compressed, anterior and posterior faces glabrous, not spined; spines of posteroventral margin conspicuously longer, thinner, and more tapering than those on dorsal margin .................... ( Cyrtomenus ) 21

20’. Posterior tibia not or only weakly compressed, dorsal and ventral spines about equally developed ....................... 25

21. Mesopleural evaporatorium posteriorly interrupted by shining, submarginal band. ............................................... 22

21´. Mesopleural evaporatorium entire .............................................................................................................................. 24

22. Apices of juga projecting as blunt to acute triangle ......................................................... Cyrtomenus emarginatus Stål

22´. Apices of juga rounded, not projecting triangularly ................................................................................................... 23

23. Interocular width distinctly greater than length of head; costa not continuing or paralleling outline of lateral margins of pronotum, distinctly more flaring posteriorly ................................................................. Cyrtomenus grossus Dallas

23´. Interocular width less than length of head; costa continuing or paralleling outline of lateral margins of pronotum ....

............................................................................................................................................ Cyrtomenus teter (Spinola) 24. Sternites IV to VI with postmedian, partial, transverse row of prominent setigerous punctures on lateral third; posterior tibia strongly compressed, its greatest diameter nearly or quite equal to that of fore tibia...................................... ........................................................................................................................................... Cyrtomenus crassus Walker 24’. Sternites IV to VI without a transverse row of prominent setigerous punctures on lateral third; posterior tibia weakly to moderately compressed, greatest diameter not more than two thirds that of fore tibia .............................................. ......................................................................................................................................... Cyrtomenus bergi Froeschner

25. Head with a complete row (extending from eye to apex of jugum) of coarse, more or less contiguous punctures giving rise to numerous long hairs and usually also to a row of pegs ....................................................... ( Tominotus ) 26

25´. Head without a complete row (absent or extending not more than three-fourths of way to apical angle of jugum) of coarse setigerous punctures; pegs never present ................................................................................ ( Dallasiellus ) 27

26. Mesopleural evaporatorium interrupted posteriorly by a transverse, marginal polished band; a broad band of setigerous punctures along the sides of the pronotum ........................................................ Tominotus hogenhoferi (Signoret)

26´. Mesopleural evaporatorium not interrupted posteriorly by polished band; with a row of six or seven setigerous punctures on lateral submargin of pronotum ..................................................................... Tominotus unisetosus Froeschner

27. Margin of jugum with a dorsal, marginal carina that runs from apex to eyes .................... Dallasiellus lugubris (Stål)

27’. Margin of jugum wide, without carina or only a partial submarginal carina that do not reach eyes ............................. .................................................................................................................................... Dallasiellus reflexus Froeschner

Figures

FIGURES 8 – 12. Amnestus henryi sp. nov. 8. Fore leg. 9. Hind leg. 10. Prosternal carina. 11. Metathoracic scent gland. 12. Paramere.