THE SHORT- WINGED SCAVENGER BEETLES. 



405 



thorax, coarsely and densely punctate and with an almost complete spiral 

 behind the middle. Abdomen at base slightly narrower than elytra, very 

 feebly tapering to apex, finely and rather sparsely punctate, the transverse 

 carina? with three cusps. Length 3.5-4 mm. 



Marion, Vigo, Lawrence, Clark, Floyd and Posey counties; 

 scarce. March 1-November 28. Taken by sifting, beneath mul- 

 lein, etc. Resembles femoratus in form, size and color, but the 

 sculpture is much more regular, the abdomen less tapering and the 

 median impression of thorax wholly different. 



Division C. 



Here a part, or all of the punctures are united or confluent, but 

 the channels which they form are never arranged in a complete 

 spiral or whorl on any part of the elytra. "The channels or punc- 

 tures may be comparatively distant or very closely compacted, and 

 the interspaces correspondingly wide or acute, convex or flat, highly 

 polished or minutely granulose and feebly shining." The thorax 

 is always marked with a distinct impression or canaliculation on 

 some part of the middle of the disk. The following species have 

 been taken or probably occur in the State : 



KEY TO INDIANA SPECIES OF DIVISION C. 



a. Larger, more than 2 mm. in length ; elytral suture not more than one- 

 third longer than thorax ; transverse carinas of abdomen with three 

 cusps. 



J). Form extremely slender, nearly cylindrical ; elytra much shorter than 

 thorax, head much wider than elytra ; length 3-3.5 mm. 



783. STRANGULATl S. 



hb. Form much more robust ; elytra at most but little shorter than thorax, 

 usually longer. 



d. Larger, 3.7-4.8 mm. ; head wide and robust, as broad as or broader 

 than elytra; males (except in neglectus) with the side margins 

 of the impressed area of fifth ventral segment in the form of 

 ridges which terminate behind in acute teeth. 

 e. Legs black ; length 3.7-4 mm. inteusus. 

 ee. Legs piceous or paler. 



f. Head not twice as wide as long, deeply excavate between the 

 eyes; legs pale pieeous-brown : length 4-4. S mm. 



784. ERYTHROPUS. 



//. Head twice as wide as long, feebly excavate between the eyes ; 

 legs piceous ; length 3.8-4 mm. neglectus. 

 dd. Smaller, not over 3.5 mm. ; males with margins of impressed area 

 of fifth ventral without ridges or teeth. 

 g. Elytral suture equal in length to thorax, the hitter wider before 

 the middle: form slender: length '2.3 mm. subtilis. 



