Enaptorhinus

Han, Kyungduk, Zhang, Runzhi & Pelsue, Frank W., Jr., 2007, Keys To The Species Of The Genus Enaptorhinus Waterhouse (Coleoptera: Curculionidae: Entiminae: Tanymecini) With Description Of A New Species From China, The Coleopterists Bulletin 61 (1), pp. 127-134 : 128-129

Key to the species of the genus Enaptorhinus (males)

1 Hind tibia without long, soft hairs............................................. 2

19 Hind tibia with many long, soft hairs......................................... 3

2 Elytral declivity with long bristles.............................. E. dispar Voss

29 Elytral declivity without long bristles........................... E. fallax Voss

3 Dorsal surface of elytra flat, depressed........................................ 4

39 Dorsal surface of elytra slightly convex....................................... 5

4 Elytra distinctly shorter than 2 times width; 5th interval strongly costate, formed by peaked granules; setae on the anterior margin of elytral punctures fine, hair-like; pterygium of rostrum (upper margin of antennal scrobe) well-developed; dorsal surface of rostrum slightly tumid to flat............................................................. E. sinensis Waterhouse

49 Elytra longer than 2 times width; 5th interval slightly costate, not granulate; setae on anterior margin of elytral punctures broad, leaf-like; pterygium of rostrum not developed; dorsal surface of rostrum strongly tumid......................................................... E. argentellus Voss

5 Dorsal surface of rostrum more tumid than frons; pterygium not developed, anterior inside of antennal scrobe visible in dorsal view..................................................................... E. shansiensis n. sp.

59 Dorsal surface of rostrum as tumid as frons; pterygium developed, making anterior inside of antennal scrobe invisible in dorsal view................... 6

6 Elytra without stripes formed by scales, 5th and 6th intervals a little more convex than the others, with only a weak longitudinal carina formed by granules................................................ E. convexiusculus Heller

69 Elytra with longitudinal stripes formed by scales on each 3rd interval, and with transverse stripes on the anterior parts of elytral declivity; 5th and 6th intervals as convex as the other intervals...................................... 7

7 Anterior part of elytral declivity with a diagonal stripe on each side from 1st interval to 4th interval, a pair of stripes forming a V-shape; intervals with strongly peaked granules; elytra with only circular and oval scales; male body more slender and longer; legs black or reddish brown...................................................................... E. granulatus Pascoe

79 Anterior part of elytral declivity with a linear, transverse stripe on each side from 1st to 3rd interval, or from 2nd to 3rd; intervals with weakly peaked granules; elytra with elongate, leaf-like scales from 1st to 4th interval; body shorter; legs reddish brown, femoral/tibial joints (distal part of femur and basal part of tibiae) dark brown.................. E. alini Voss