216 MEMOIRS ON THE COLEOPTERA 



head abutting broadly against the prothorax; infra-lateral carinae 

 distinct and entire; size very minute 5 



3 Neck slender, about a third as wide as the head; antennae short, 

 the penultimate joints strongly transverse; four basal impressions 

 of the tergum subequal, deep and coarsely punctate; basal joint of 

 the hind tarsi moderate, shorter than the next two. Atlantic 

 regions Leptobamona 



Neck wide, fully half as wide as the head or more; tergitical impressions 

 wholly impunctate but with rather large and strong micro-reticu- 

 lation 4 



4 Tergum generally bearing medial crests or carinse in the male, affecting 

 the first and fifth segments; antennae long, the penultimate joints 

 elongate to feebly transverse; basal joint of the hind tarsi long. 

 Atlantic to Sonoran Pacific regions Gyronycha 



Tergum without modification in the male; antennae shorter, the penul- 

 timate joints transverse; basal joint of the hind tarsi shorter than 

 the next two combined; body smaller and more slender. Pacific 

 coast fauna Gyronychina 



5 Elytra less developed than in any of the preceding genera, sometimes 

 much abbreviated, the outline generally more parallel and compact, 

 though with the abdomen long as usual; antennae notably short 

 and relatively thicker distally as a rule, the penultimate joints 

 strongly transverse. Atlantic and Gulf States Alisalia 



Bamona Sharp, was originally described from Mexico, but the 

 three American species falliana, tenuissima and Carolina, seem to 

 be strictly congeneric. The second scarcely merits its name, for, 

 although the most slender of the three in Bamona, it is stout when 

 compared with most of the species following in the group, especially 

 the extremely slender Leptobamona and Alisalia; as well as several 

 of the genus Gyronychina. Leptobamona has for its type and only 

 known species Gyronycha pertenuis Csy. ; it is represented at present 

 by a single specimen. 



If any combination is to be made among the above genera, I 

 would recommend that Gyronychina be made a subgenus of Gyro- 

 nycha. The other genera are so distinct among themselves that 

 they cannot be reduced to the status of subgenera with any degree 

 of propriety. 



Gyronycha Csy. 



This genus includes the largest species of the group. It is probable 

 that the male has cariniform tubercles on the tergum in all the species. 

 The following were overlooked in my previous revision (Ann. N. Y. 

 Acad., VII, p. 372): 



