154 H. C. FALL. 



Anterior coxae distinctly or even widely separated, the prosternal process paral- 

 lel, the antennae usually received between the coxae in repose 7. 



2. Last three joints of antennae much elongated 4. 



Last three joints of antennae not conspicuously longer 3. 



3. Antennae rather feebly serrate in both sexes Actenobius. 



Antennae pectinate in the male, serrato-pectiuate in the female. 



Euceralocerits. 



4. Side margin of prothorax entire, joints of antennal stem usually short, not 



distinctly serrate or pectinate, tarsi less slender 5 



Sidemargin of prothorax obliterated anteriorly, antennal stem serrate or pec- 

 tinate; tarsi slender, the third and fourth joints not emarginate, the 

 articulation strictly terminal Xeranobium. 



5. Middle coxae distinctly separated ; third and fourth tarsal joints emarginate 



(except in Oligomerus lenellus) ; elytra punctate-striate 6. 



Middle coxae approximate; third joint of tarsi not emarginate; elytra with 

 indistinct or feebly defined rows of punctures. . . .OligOllierodi'M. 



6. Last joint of both labial and maxillary palpi elongate, fusiform; front coxae 



contiguous (except in sericans and tenellus) ; antennae 9-, 10-, or 11- 



jointed Oligomerus. 



Last joint of maxillary palpi parallel and obliquely truncate; last joint of 

 labial palpi broadly triangular ; front coxae distinctly separated ; an- 

 tennae 11-jointed Sitodrepa. 



7. Antennae serrate, joints 9-11 not conspicuously longer 18. 



Antennae not serrate, 9-11 long 8. 



8. First two ventral segments connate, the suture obliterated at middle; protho- 



rax without side margin, except toward the base Gastrallus. 



First veutral suture distinct; side margin of prothorax entire, except in Ha- 

 drobregmus defectus • 9. 



9. Antennae not pectinate in either sex 10. 



Antennae pectinate in the male t'tenobium. 



10. Claws with a broad basal tooth 11. 



Claws not toothed • • ■ 12. 



11. Thighs rather strongly clavate Ptinodes. 



Thighs not or but feebly clavate Tricliodesma. 



12. Vestiture relatively dense, the upper surface and legs with intermixed longer 



erect hairs 13. 



Vestiture sparser and completely recumbent 14. 



13. Metasternum not excavated in front; outer apical angle of tibiae not everted. 



Nicobiiiin. 

 Metasternum moderately deeply excavated in front ; outer apical angle of 



front and middle tibiae acutely produced Anobiopsis. 



1 1. Ventral segments free, sutures distinct, tarsi narrower 15. 



Ventral segments connate; sutures, except the first, faint or obliterated at 

 middle, tarsi stouter 17. 



15. Metasternum not deeply excavated anteriorly, at most a little concave.- • .16. 

 Metasternum deeply excavated in front Ail obi mil. 



16. Third ventral segment short, tibiae not produced externally at apex. 



Hadrobregmus. 

 Third ventral segment long, tibiae produced externally at apex. 



Microbregma. 



