THE SHORT- WINGED SCAVENGER BEETLES. 



345 



KEY TO INDIANA GENERA OF MYRMEDONIINI. 



(/. Sides of the front dorsal segments of abdomen without tufts of hair. 

 b. Maxillary cavity or hiatus only narrowly separated from and not 

 reaching as far behind as the eyes; inner lobe of maxillae with a 

 row of long, curved teeth, or comb-like on the inner margin toward 

 the curved apex ; epimera of metasternum as a rule not reachiug 

 beyond the hind margin of elytra. 

 c. Head strongly constricted behind into a neck, the latter only about 

 one-fourth as wide as head. 

 cl. Scutellum not carinate. IX. Chitalia. 



del, Scutellum acutely and strongly carinate. X. Falageia. 



cc. Head not or only moderately constricted behind. 



e. Front ventral segments of abdomen at base distinctly trans- 

 versely sulcate or transversely constricted. 

 f. First joint of hind tarsi at least as long as second and third 

 together. XL Tachyusa. 



//. First joint of hind tarsi shorter than second and third to- 

 gether. 



g. Thorax transversely impressed at base. XII. Gnypeta. 

 gg. Thorax not impressed at base. XIII. Meronera. 



ee. Front ventral segments of abdomen at base not transversely sul- 

 cate or constricted. 

 h. Maxillary palpi with five, labial palpi with four joints. 



i. Seventh segment of abdomen not carinate in male. 



XIV. Tinotus. 



ii. Seventh segment of abdomen carinate in male. 



j. First four joints of hind tarsi gradually decreasing in 

 length; elytra simple in male. XV. Platandria. 



jj. First four joints of hind tarsi equal ; elytra carinate in 

 male. XVI. Hoplandria. 



hh. Maxillary palpi with four, labial palpi with three joints. 



Jc. Abdomen wholly without punctures ; basal joint of hind tarsi 

 as long as the next two combined. XVII. Xesturida. 

 Jck. Abdomen with distinct punctures ; hind tarsi wuth four basal 

 joints equal. 



7. Entire body clothed with rather long erect hairs. 



XVIII. Trichitjsa. 

 II. Body at most in parts clothed with erect hairs. 



XIX. Atheta. 



bb. Maxillary hiatus or cavity separated from the eyes by rather large 

 cheeks and reaching behind further than the eyes; inner lobe of 

 maxillae with three or four curved teeth on the inward turned apex 

 and with long and dense pubescence behind these teeth, the outer 

 lobe very long and slender; epimera of metasternum always reach- 

 ing beyond the hind margin of elytra ; first joint of hind tarsi elon- 

 gate longer than second and third joints together. XX. Zyras. 

 aa. Sides of front dorsal segments of abdomen with dense tufts of yell >\\ 

 hairs. XXI. Xeistodtsa. 



