..-„ 173 



Trihe 111. II AKI'AI.IM. 



^Vntenna' usually slender, arising from beneath a slight frontal 

 ndge. two basal joints, sometimes a portion of the third, glabrous. 

 Head often large, usually moderate, not narrowed to a neck ; labrura 

 iiKiderately prominent, truncate or emarginate; mandibles sU)ut, 

 acute at tip and without bristle-bearing puncture on outer side ; 

 mentum broad, emarginate, with cr without a median tooth. 

 Thorax variable in form, with a lateral seta, but none in the hind 

 angles. Body sometimes subpedunculate; scutellum distinct. Ely- 

 tra usually margined at base, sides narrowly inflexed, surface stri- 

 ate, often densely punctured, either pubescent or smooth, with or 

 without dorsal punctures. Prostemum not prolonged; hind coxp 

 contiguous; front tarsi with the outer apical angle spinous or ob- 

 tusely prolonged. 



The tribe is a large one, being represented in the United States 

 fauna by 17 genera, 14 of which occur in Indiana. Many of these 

 have been established on trivial or sexual characters, so that they 

 are difficult to distinguish unless both sexes are at hand. To make 

 shorter an otherwise long generic key, the genera are distributed by 

 Ilcrn among four .subtribps. three of which are represented in. 

 Indiana. < 



KEY TO INDIAN.\ SVIiTlilBES OF I r.\ RPAI.IX I. 



,(. Front tarsi of male feebly or not at all clilatecl, pilose or spinnse be- 

 neath; e.ves, ex(e])t in Ar/unoihTiis. small and widely sejiarated from 

 the mouth beneath: oblong or cval conve.v species, usually piceous or 

 brownish-yellon- in hue. Subtribe A., p. 17:',. 



(HI. Fvimt tarsi of male dilated: less conve.x. blaik. brown or pii-cius, rarely 

 lirownish-yellow species. 

 h. Dilated .inints !.r front tarsi with two rows of small fciiles beneath. 



Subtribe B.. p. 178. 



hi). Dilated joints of front tarsi densely spongy pubescent or brush-like 



beneath. Subtribe C, ]). 19.3. 



Subtribe A. (D.-vpti.) 

 To this group beiong five Indiana genora, separated as follovys : 



KEY TO INDI.\N.\ OENERA Or (IROIP .\. 



(I. JIandibles promlnout. cj-nssing at an angle, deejily strigose tit tiii: l)oily 

 subpedunculate: front tibiie strongly fossorial. LXI. (Jeopint-ls. 



aa. Mandibles not prominent, at most feebly crnssing; liidy not peduncu- 

 late. 



