AMERICAN COMrONENTS OF THE TENTYRIIN^ 343 



and slender and the hind tarsi slender and filiform, with the 

 basal joint much longer than the fourth. The metasternum is 

 invariably much shorter than the first ventral segment and the 

 body is oval, convex and glabrous. Many Mexican species, 

 some of which were described by Mr. Champion in the " Bio- 

 logia " under the name Enimenastus^ will enter this genus, 

 which, with the numerous American species, will prove to be 

 extensive, the various forms being very local in distribution as 

 usual in Sonoran genera. Our species, so far as known at 

 present, are the following : — 



Prothorax transversely and rectilinearly truncate at base throughout tlie 

 width z 



Prothorax subtruncate, sometimes very feebly lobed toward the middle ; 

 larger, more or less opaque species, with the prothorax narrowed 

 from base to apex and having but slightly arcuate sides 8 



Prothorax distinctly lobed at the middle of the base or evidently 

 bisinuate i o 



2 — Prothorax inflated and more strongly rounded at the sides just be- 



hind the middle, thence converging and just visibly arcuateto the 

 obtuse but not rounded basal angles, and still more converging and 

 broadly subsinuate to the apical angles, which are somewhat 

 prominent though slightly blunt. Body obese, strongly convex, 

 polished, piceous-black, the legs bright rufous ; head not very 

 coarsely but deeph^, not densely punctured, the sides strongly 

 rounded, the apex broadly sinuate ; epistoma slightly swollen, 

 paler and more linely, very densely punctate ; prothorax not quite 

 twice as wide as long, the apex deej^ly sinuate and scarcely two- 

 thirds as wide as the base, the punctures rather small but deep, 

 close-set, becoming but little larger but closer, though not con- 

 fluent, toward the sides ; scutellum moderately large, smooth, 

 transverse ; elytra two-fifths longer than wide, less than three 

 times as long as the prothorax and not wider, gradually acutely 

 ogival at tip, with unimpressed series of rather coarse, close-set 

 punctures, the intervals wide, finely and confusedly punctured 

 throughout, without trace of series ; abdomen feebly rugulose, 

 minutely, sparsely punctate medially. Length 6.7 mm. ; width 

 3.1 mm. Arizona (Holbrook), — H. F. Wickham. 



discrepans n. sp. 



Prothorax not subprominently inflated behind the middle, the sides 

 moderately converging from base to apex and broadly, subevenly 

 arcuate, the surface strongl}' shining or polished throughout 3 



3 — Scutellum well developed, strongly transverse 4 



Scutellum small or moderate in size, transverse 5 



