57 



character and find the most workable to be founded on the differ 

 ence between a " sinuation" and an " excision" without regard to 

 the question whether the inequality is in the side or the base. 

 Even taking this as the crucial point, there is nevertheless a 

 possibility of doubt in respect of a few species which group the 

 insect should be referred to, and therefore it seems desirable to 

 specify M. clypealis, acutangulus, and imitator as species in respect 

 of which there is room for doubt whether the emargination of the 

 hind part of the prothorax should be regarded as a strong sinua- 

 tion or a moderate excision. With this qualification I believe 

 that it will be easy to distinguish the described species by means 

 of the following tabulation. 



A. Claws without basal appendage. 



B. Upper surface not clothed with long erect hairs. 

 C, Hind tibite normal (not as CC). 



D. Prothorax not excised in its hinder part. 



E. Hind tarsi not particularly slender, — their basal joint notably 

 shorter than the next two together. 

 F. External apical process of hind tibiae very long, — about same 

 length as longer spur on inner side. 

 G. Hind angles of prothorax acute 

 GG. Hind angles of prothorax obtuse 

 FF. External apical process of hind 

 tibi« notably shorter. 

 G. Hind angles of prothorax very 

 acute and strongly prominent 

 hindward. 

 H. Elytra with well defined costa3 

 HH. Elytra not costate 

 GG. Hind angles of prothorax right 

 or moderately acute, not (or 

 scarcely) prominent hindward 

 H. Clypeus very strongly triangu- 

 larly excised in front. 



I. Prothorax of normal convexity 



II. Prothorax strongly convex 



longitudinally ... 

 HH. Clypeus widely and feebly 

 emarginate in front. 



I. Basal joint of hind tarsi about 



same length as apical joint. 

 J. Base of prothorax feebly 

 sinuate 

 *JJ. Base of prothorax pro- 

 foundly sinuate on either 

 side ... 



II. Basal joint of hind tarsi not- 

 ably shorter than the apical 

 joint 



GGG. Hind angles of prothorax obtuse 

 (though not at all ronnded off) 

 EE. Hind tarsi slender, — their basal joint 

 about as long as the next iwo to- 

 gether. 



mellyanus, Westw. 

 spurius, Kirby. 



latus, Waterh. 

 ater, Waterh. 



major, 



Blackb. 



gibbicolHs, Blackb. 



crenaticollis, Blackb. 



zlypealis, Blackb. 



ordensU^ Blackb. 

 coUaris. Blackb. 



