22 MEMOIRS ON THE COLEOPTERA. 



subapical width, the coxae separated; first four joints of the hind tarsi 

 equal. Length 2.5 mm.; width 0.73 mm. Mississippi (Agricultural Col- 

 lege), H. F. Weed. 



Distinguishable easily by its stout form, sternal and sexual char- 

 acters. The sternum, in connection with the larger eyes, might 

 indicate close affinity with Stethusa, but the form of the body and 

 smaller prothorax give a very different facies and the sexual char- 

 acters are of a different order. 



Atheta arizonica n. sp. Moderately stout and convex, somewhat aluta- 

 ceous, the abdomen shining; piceous-black, the elytra and legs pale brownish- 

 flavate, the antennae blackish throughout; head as usual transverse, parallel, 

 with rounded basal angles, finely, rather closely and asperulately punctate, 

 the eyes convex and at barely their own length from the base, the carinae 

 fine but entire; antennae rather slender and but feebly incrassate, the outer 

 joints slightly wider than long, the second and third equal; prothorax much 

 wider than the head and slightly narrower than the elytra, moderately trans- 

 verse, the sides parallel and evenly arcuate, the basal angles obtuse and blunt, 

 the surface finely, closely and asperulately punctate, feebly impressed before 

 the basal margin at the middle; elytra much wider than long, the suture 

 distinctly longer than the prothorax, similarly punctate; abdomen parallel, 

 with broadly arcuate sides, narrower than the elytra, finely and plentifully 

 though not densely punctate, the fifth tergite slightly longer than the fourth, 

 the sixth (cf ) with two tuberculiform teeth separated by a feeble sinus at the 

 middle of the apex and mutually a little more distant than either from the 

 slender, internally concave lateral projection; mesosternal process becoming 

 moderately narrow but not aciculate, its strongly rounded apex extending to 

 apical third of the separated coxa:: and considerably distant from the very 

 short and broadly rounded metasternum; basal joint of the hind tarsi shorter 

 than the second, two to four equal. Length 2.3-2.6 mm.; width 0.65-0.7 

 mm. Arizona (Tucson). 



Somewhat allied to weedi but differing in the sterna, cephalic 

 carinae and sexual characters; the mesosternal process is not so 

 wide but is not aciculate, as it generally is in typical Atheta. 



Atheta umbonalis n. sp. Rather stout, moderately convex, black, the 

 elytra dark rufo-piceous, the legs pale; antennae blackish, the two basal 

 joints pale; body not very shining, strongly micro-reticulate, the abdomen 

 more coarsely but feebly so and shining; punctures asperulate and rather 

 close-set, sparser on the head, very fine and sparse on the abdomen; head 

 moderate, the eyes at barely their own length from the base, the carina? 

 wholly wanting; antennae thick but only feebly incrassate, the outer joints 

 distinctly transverse, the eleventh rather longer than the two preceding, the 

 second and third equal; prothorax convex, rather strongly transverse, much 

 wider than the head and distinctly narrower than the elytra, the sides paral- 

 lel, subevenly rounded, the basal angles distinct and only slightly blunt; 

 surface unimpressed; elytra parallel, much wider than long, much longer 



