238 GEO. H. HORN, M. D. 



above, not subangulate ; the margin entire with few exceptions. 

 The sculpture of the surface is never very pronounced ; that is, the 

 punctures of the thorax are not conspicuously coarse, nor are the 

 elytral costfe well marked. 



The following table will assist in the determination of the species : 



Males with the last ventral with a cupuliform depression, the penultimate seg- 

 ment with very feeble characters. 



Form short and robust, larger species 24. crasisissiiiia. 



Form oval, surface slightly pruinose, smaller 25. i$iib|>riiino!!>a. 



Males without any well defined concavity of the last ventral, the penultimate 

 with a more or less developed transverse or sinuous elevation. 

 Thorax strongly serrate, fimbriate with long hair, clypeus with scarcely a 



trace of emargination 26. erraiis. 



Thorax not serrate, at most slightly irregular or feebly crenate, the cilife 

 short, clypeus distinctly emarginate. 

 Penultimate ventral of male with a semicircular, slightly rugulose de- 

 pression, without any transverse ridge 27. iiiversa. 



Penultimate ventral of male with a transverse, more or less sinuous ridge 

 in front of the posterior margin of the segment. 

 The transverse ridge of the penultimate ventral of the male deeply 

 divided by the median depression of the abdomen. 28. bipartita. 

 The transverse ridge of penultimate ventral of male entire. 



Surface very conspicuously pruinose 29. micaiis. 



Surface not at all pruinose. 



Species oblong, depressed, the punctuation of thorax and elytra 



relatively very coarse 30. diflinis. 



Species larger and of moderately robust facies, the punctuation not 

 conspicuously coarse. 

 Fixed spur of male hind tibia long, slightly curved and with a 



slight hook at tip 31. veheiiieiis. 



Fixed spur of male hind tibia moderate in length, straight. 



32. Ttisca. 



24. li. crassissima Blanch. — Ovate, robust, castaneous or brown, when 

 recent slightly iridescent, shining. Clypeus very feebly emarginate, the margin 

 moderately reflexed, moderately closely punctate, front more densely punctate. 

 Thorax short and broad, convex, narrowed from base to apex, the sides more ob- 

 lique in front, margin distinctly crenate and ciliate, surface closely, not very 

 coarsely punctate, smoother at the sides, the median line indistinctly smoother, 

 a feeble channel along the basal margin from the hind angles not reaching the 

 middle. Elytra somewhat more coarsely punctured than the rhorax, the punc- 

 tures less dense, surface sometimes slightly rugulose, the costje usually very in- 

 distinct. Pygidium sparsely punctate, indistinctly in male. Metasternum 

 densely punctured, the hair long and dense, shorter in the female ; sides of ab- 

 domen sparsely punctate, more distinctly in the female. Claws cui'ved, the tooth 

 moderate and slightly intramedian % , or stronger and median 9 • Last joint of 

 maxillary palpi slender, fusiform, not impre.ssed. Length .60 — .82 inch; 15 — 

 21 mm. 



