Akalyptoischion

Hartley, Christopher S., Andrews, Fred G. & Mchugh, Joseph V., 2007, A Taxonomic Revision Of The Genus Akalyptoischion Andrews (Coleoptera: Latridiidae), The Coleopterists Bulletin (mo 6) 61, pp. 1-50 : 10-12

Key to Species of Akalyptoischion

1. Antenna with a 2-segmented club.......................................... 2

- Antenna with a 3-segmented club.......................................... 6

2(1). Lateral pronotal margin and dorsal surfaces of head and pronotum glabrous; elytra subglabrous, with very short decumbent setae on interspaces 1, 3, 5 and lateral margin only..................................................... A. leptosoma Hartley, Andrews & McHugh new species

- Lateral pronotal margin and dorsal surfaces of head and pronotum setose; all elytral interspaces setose, setae short to very long..................... 3

3(2). Elytron ( Fig. 14) and lateral pronotal margin ( Fig. 47) with only short decumbent setae; setae all the same length and appressed to body................................................................ A. chandleri Andrews

- Elytron and lateral pronotal margin ( Fig. 45) with much longer setae that are conspicuous and not appressed to body; elytral setae on raised interspaces longer than setae on non-raised interspaces.................. 4

4(3). Elytra without erect setae........................... A. sleeperi Andrews

- Elytra with rows of long erect setae on interspaces 1, 3, 5 and lateral margin...................................................................... 5

5(4). Head ( Fig. 31) broadly trapezoidal, width subequal to length; eyes small, not prominent................................ A. giulianii Andrews

- Head ( Fig. 34) narrow, broadening posteriorly; eyes large, prominent............ A. heterotrichos Hartley, Andrews & McHugh new species

6(1). Dorsal surface of head, pronotum and elytra subglabrous, setae microscopic, visible only under high magnification (100 3)........... 7

- Dorsal surface of head, pronotum and elytra setose, setae short or long but easily seen at low magnification (10 3)............................ 13

7(6). Pronotum subquadrate, sides not converging greatly posteriorly; pronotal foveae indistinct, 2 shallow furrows reaching across entire width of pronotum; abdominal ventrites II–IV with a pair of foveae basally at midline and without basal depressions ( Fig. 18)........................... A. diadeletron Hartley, Andrews & McHugh new species

- Pronotum with sides converging posteriorly ( Figs. 2, 42–44); with 4 distinct pronotal foveae, abdominal ventrites II–IV without foveae and with normal basal depressions ( Fig. 17)................................ 8

8(7). Ventrite I with one or more deep, conspicuous punctures on median surface ( Figs. 17, 50)...................................................... 9

- Ventrite I without punctures on median surface ( Figs. 49, 51)...... 10

9(8). Pronotum laterally explanate with lobed anterior corners (e.g., Fig. 13); mandibles large and visible dorsally; ventrite I with several distinct punctures on median surface................................................................... A. gigas Hartley, Andrews & McHugh new species

- Pronotum only slightly explanate with evenly rounded anterior angles (e.g., Fig. 45); mandibles smaller, not visible dorsally; ventrite I with a single puncture at midline ( Fig. 17)............. A. atrichos Andrews

10(8). Median surface of metasternum without punctures ( Fig. 48)................................................................ A. hormathos Andrews

- Median surface of metasternum with scattered punctures ( Figs. 23, 24)......................................................................... 11

11(10). Abdominal ventrite I with many faint, scattered punctures on median surface visible only on cleared and slide-mounted specimens ( Fig. 11)............ A. polytremetron Hartley, Andrews & McHugh new species

- Abdominal ventrite I without punctures on median surface.......... 12

12(11). Y-shaped carina present on mesosternum ( Fig. 24)........................................... A. texas Hartley, Andrews & McHugh new species

- Y-shaped carina not present on mesosternum (e.g., Fig. 23)............................ A. delotretos Hartley, Andrews & McHugh new species

13(6). Elytron with seven striae.................................................................. A. heptalocos Hartley, Andrews & McHugh new species

- Elytron with six striae................................................... 14

14(13). Elytra with erect setae on raised intervals ( Fig. 15) (more conspicuous in lateral view at posterior end of elytra).............................. 15

- Elytra without erect setae on raised intervals ( Fig. 14)............... 23

15(14). Head with erect setae present at least at posterior corners near eyes ( Figs. 1, 32)............................................................... 16

- Head without erect setae ( Figs. 33, 35)................................. 18

16(15). Abdominal ventrite I impunctate on median surface; erect setae present at posterior corners of head and along lateroventral sides of head; dorsal surface of head glabrous............................................................. A. pogonias Hartley, Andrews & McHugh new species

- Abdominal ventrite I with a pair of punctures on median surface (Fig. 50); erect setae present only at posterior corners of head ( Fig. 32); dorsal surface of head densely setose ( Fig. 32)......................... 17

17(16). Pronotum with wide, explanate lateral sides and sharp, 90u anterior corners ( Figs. 1, 12, 43); antennomere III narrow and 2 times longer than wide, antennal club loose and club segments elongate........................ A. hadromorphus Hartley, Andrews & McHugh new species

- Pronotum with short lateral sides and gently rounded anterior corners ( Fig. 42); antennomere III short, sides arcuate, antennal club shorter, club segments not distinctly elongate.............. A. anasillos Andrews

18(15). Ventrite I with a pair of punctures on median surface (Fig. 50)..... 19

- Ventrite I impunctate on median surface ( Figs. 49, 51)............... 20

19(18). Erect setae on elytra long, stout and not recurved at the tip; eyes ( Fig. 33) large and prominent............................................................... A. dyskritos Hartley, Andrews & McHugh new species

- Erect setae on elytra short and recurved at the tip; eyes (e.g., Fig. 35) smaller, not prominent A. prionotus Hartley, Andrews & McHugh new species

20(18). Labrum anterior margin deeply emarginate ( Fig. 35); mandibles large and often visible dorsally................................................ 21

- Labrum anterior margin not or slightly emarginate (e.g., Figs. 32, 33); mandibles smaller, not visible dorsally.................................. 22

21(20). Dorsal surface of head sparsely punctate and sparsely setose, with 2 deep, conspicuous circular foveae ( Fig. 35); lateral pronotal margin with 2 long erect setae anteriorly and one posteriorly; elytral setation long ( Fig. 15)......................................... A. tomeus Andrews

- Dorsal surface of head densely punctate, head foveae shallower and less distinct; lateral pronotal margin without setae; elytral setation short ( Fig. 16).......... A. echinos Hartley, Andrews & McHugh new species

22(20). Eye 2-faceted; elytra with both long, stout, erect setae and short decumbent setae........................................................................ A. bathytrematos Hartley, Andrews & McHugh new species

- Eye 4-faceted; elytra with only short, erect setae, the tips strongly recurved..................................................................................... A. parechinos Hartley, Andrews & McHugh new species

23(14). Elytra sparsely setose with very short decumbent setae all of the same length............................................. A. quadrifoveolata (Fall)

- Elytra densely setose; setae longer, tousled and variable in length........................ A. lasiosus Hartley, Andrews & McHugh new species