SCRAPTIIDAE, Gistel, 1848

Johnston, M. Andrew, Naczi, Robert F. C. & Gimmel, Matthew L., 2024, Review of North American Scraptiidae (Coleoptera: Tenebrionoidea), with a Catalog of World Genera, The Coleopterists Bulletin 78 (2), pp. 171-200 : 186-187

KEY TO GENERA OF NORTH AMERICAN SCRAPTIIDAE

(INCLUDING CENTRAL AMERICA AND THE W EST INDIES)

1. Thorax and elytra without transverse strigae; protrochantin broadly exposed [ Scraptiinae ] ....................................................... 2

1′. Thorax and at least base of elytra with transverse strigae; protrochantin concealed, or occasionally partially visible anteriorly in some Anaspis [ Anaspidinae ]................ 7

2(1). Penultimate (third) metatarsomere lacking lobe ( Fig. 1D ) [ Allopodini ]...................... 3

2′. Penultimate (third) metatarsomere lobed ( Fig. 2J ) [ Scraptiini ]................................. 4

3(2). Eye attaining posterior margin of head; antenna simple in both sexes ( Figs. 1A, B ) ...................................... Allopoda LeConte

3′. Eye not attaining posterior margin of head ( Fig. 1H ), separated by nearly the width of the eye from the hind margin; antenna of males flabellate ( Fig. 1E ), in females simple ( Fig. 1F ) ................... Pectotoma Hatch

4(2′). Terminal labial palpomere cylindrical, not expanded apically ( Fig. 2F ); antennomere 3 longer than 4 ........... Neoscraptia Fender

4′. Terminal labial palpomere expanded, lunulate ( Figs. 2E, H ); antennomere 3 shorter than 4 ........................................................ 5

5(4′). Epipleuron abruptly ending near metacoxa ( Fig. 2L ); terminal maxillary palpomere elongate, distinctly cultriform ( Fig. 2G ) ......................................... Canifa LeConte [some Central American Scraptia key here]

5′. Epipleuron gradually narrowed, ending between ventrite 3 and elytral apex ( Fig. 2K ); terminal maxillary palpomere variable, typically not extremely elongate ( Figs. 2E, F ).............................................................. 6

6(5′). Terminal maxillary palpomere forming an obtuse triangle ( Fig. 2E ); body fairly elongate ( Fig. 2A ) (widespread)......................... ....................................... Scraptia Latreille

6′. Terminal maxillary palpomere elongate, sub-cultriform ( Fig. 2H ); body form more stout ( Fig. 2D ) (West Indies)........................ ........................ Cteniacantha Quedenfeldt

7(1′). Fourth pro- and mesotarsomeres small, hidden by lobed third tarsomeres ( Fig. 3F ) [ Anaspidini ] ............................................. 8

7′. Fourth pro- and mesotarsomeres lobed, not obscured, third tarsomere simple [ Pentariini ] .................................................................. 9

8(7). Notosternal suture elongate, meeting anterior prothoracic foramen dorsally ( Fig. 4B ); terminal labial palpomere strongly expanded, lunulate ( Fig. 4C ); males lacking appendages on abdominal ventrites (southern Florida and West Indies )..................... ....................... Sphingocephalus Liljeblad

8′. Notosternal suture short, meeting anterior prothoracic foramen ventrally ( Fig. 3B ); terminal labial palpomere moderately expanded, deeply emarginate apically, appearingsomewhatV-shaped( Fig.3A );males usually with appendages on abdominal ventrites 3 and/or 4 ( Fig. 3C ) (widespread) ....................................... Anaspis Geoffroy

9(7′). Elytra strigose only on basal half; antenna very short, antennomeres 4 and 5 each as wide as long; body very small, <1.8 mm long ............................ Naucles Champion

9′. Elytra strigose throughout; antenna typically longer, antennomeres 4 and 5 variable, each as long as to much longer than wide; body typically larger,> 2 mm long........ 10

10(9′). Mandibles bifid apically ( Fig. 7A ); terminal maxillary palpomere bearing a short, subapical digitate sensillum ( Fig. 7B )............. ....................................... Pentaria Mulsant

10′. Mandibles entire ( Fig. 7C ); terminal maxillary palpomere lacking subapical digitate sensillum, though terminus often hook-shaped and narrowly pointed...................... ........................................ Diclidia LeConte

Figures

Fig. 1. Allopodini, all scale bars = 1 mm. A) Allopoda lutea, dorsal habitus, B) A. dentipes, dorsal habitus, C) A. lutea, front leg, showing tibial spine (arrow) and lobed fourth tarsomere, D) A. lutea hind tarsus, showing lack of lobes on any tarsomeres, E) Pectotoma hoppingi, dorsal habitus, male, F) P. hoppingi, female, G) A. lutea, male genitalia, H) P. hoppingi, head in lateral view. bp = basal piece of tegmen; fp = fused parameres of tegmen; p = penis.

Fig. 2. Scraptiini, all scale bars = 1 mm.A) Scraptia sericea, dorsal habitus, B) Neoscraptia testacea, dorsal habitus, C) Canifa cf. pallipes, dorsal habitus, D) Cteniacantha marginata, dorsal habitus, E) Scraptia cf. speciosa, mouthparts, arrow indicating lunulate labial palpomere, F) Neoscraptia testacea, mouthparts, arrow indicating fusiform labial palpomere, G) Canifa sp., mouthparts, arrow indicating cultriform maxillary palpomere, H) Ct. marginata, mouthparts, arrow indicating lunulate labial palpomere, I) S. cf. speciosa, male tegmen, penis removed, J) S. sericea, hind tarsus showing lobed third tarsomere, K) Scraptia sp., left epipleuron, arrow roughly indicating termination near elytral apex, L) Canifa sp., left epipleuron, arrow roughly indicating termination near position of metacoxa.

Fig. 3. Anaspis, morphological characters. A) A. atrata, labial palps, ventral view, B) A. atrata, prothorax with pink line denoting external path of notosternal suture, C) A. atrata, male abdomen, ventral view, pink overlay highlighting the left appendage coming off of the posterior aspect of sternite V (ventrite 3), D) A. rufa, male terminalia, dorsal view, E) A. rufa, male segment VIII and spiculum gastrale, F) A. rufa, protibia showing lobed third tarsomere which is concealing a reduced fourth tarsomere, G) A. atrata, apex of male terminalia. III–VIII = abdominal segments; al = accessory lobe; bp = basal piece of tegmen; fp = fused parameres; p = penis; sap = spicular apodeme (proximal portion of spiculum gastrale); sp = spicular plates (distal portion of spiculum gastrale).

Fig. 4. Sphingocephalus and Naucles, diagnostic characters. A) S. ovalis, lateral habitus, scale bar = 1 mm, B) S. ovalis, holotype, pronotum, anterior aspect, overlay shows notosternal suture, C) S. ovalis, head, anterior aspect, arrow points to lunulate apical labial palpomere, D) Naucles sp., antenna, E) Naucles sp., pronotum, anterior aspect, pink overlay shows notosternal suture.

Fig. 7. Pentariini, mouthparts. A) Pentaria trifasciata, mandibles, arrow indicating bifid apex, B) P. trifasciata, maxillary palpomere, arrow showing articulated digitiform sensillum, C) Diclidia laetula, mouthparts, arrows indicating entire mandibular apices and lack of digitiform sensillum.