Acanthocephala Laporte

Packauskas, Richard J., Sites, Robert W., Taylor, Steven J., Bundy, Scott, Bradshaw, Jeffrey D. & Mitchell, Paula Levin, 2011, Review of Acanthocephala (Hemiptera: Heteroptera: Coreidae) of America north of Mexico with a key to species, Zootaxa 2835, pp. 30-40 : 31

Key to species of Acanthocephala Laporte in America north of Mexico

( Figs. 1–4 )

1. Metatibiae broadly dilated for almost entire length, ending abruptly near apex ( Figs. 5–8 )............................ 2

1'. Metatibiae broadly dilated in basal 1/2, gradually narrowing beyond middle toward apex ( Figs. 9–12 ).................. 3

2. Humeral angle of pronotum broadly rounded ( Fig. 1 ), strongly extended laterally, elevated in posterior view ( Fig. 13 ); metatibial expansions as in Figs. 5–6 .................................................................... A. declivis

2'. Humeral angles of pronotum more narrowly rounded, moderately extended laterally ( Fig. 4 ), horizontal to slightly declivent in posterior view ( Fig. 14 ); metatibial expansions as in Figs. 7–8 .......................................... A. thomasi

3. Metafemora of both sexes slightly expanded toward apex (occasionally parallel-sided or narrowed apically in males); both sexes lacking darkened areas beneath metacoxae on abdominal sternum 3 (second visible); antennal segment 4 red to yellow; metatibial expansions as in Figs. 9–10 ............................................................ A. terminalis

3'. Metafemora of males strongly incrassate, widest at middle, those of females slightly expanded; both sexes often with darkened areas beneath metacoxae on abdominal sternum 3; antennal segment 4 varying from concolorous with proximal segments to yellowish; metatibial expansion as in Figs. 11–12 ................................................... A. femorata .....................................................................................................

Figures

FIGURES 1 – 4. Habitus photographs of male Acanthocephala spp. 1. A. declivus. 2. A. femorata. 3. A. terminalis. 4. A. thomasi.

FIGURES 5 – 12. Hind tibiae of Acanthocephala, male and female respectively. 5 – 6, A. declivis. 7 – 8, A. thomasi. 9 – 10, A. terminalis. 11 – 12, A. femorata.

FIGURES 13 – 14. Humeral angles of Acanthocephala, posterior view. 13. A. declivis. 14. A. thomasi.