THE SHORT-WINGED SCAVENGER BEETLES. 



483 



as elytra, more than twice as wide as long, base and apex truncate; sides 

 rounded, widely depressed; margins with a small blunt tooth in front of 

 middle and another one-fourth from base; disk coarsely and L'ugosely punc- 

 tate and with a deep entire median groove. Elytra more than twice as 

 long as thorax, densely, coarsely and rngosely punctate. Abdomen iinely 

 and rather closely punctate. Length 2.3-2.7 mm. 



Crawford County; rare. May 26. Occurs in fungi. 



Protinus atomarius Erichs., black or brownish-black, antenna- 

 dull yellow, length 1-1.3 mm., has been recorded from near Cin- 

 cinnati and Detroit. 



Subfamily X. PIESTINAE. 



Elongate, slender, parallel species, resembling Cueujids in gen- 

 eral appearance and, like them, living beneath bark. They have 

 the antenna? inserted under the sides of the front, straight, with 

 the outer joints slightly thickened; thoracic spiracles covered; pro- 

 sternum wholly of a horn-like texture; front coxae globular. The 

 North American species of this subfamily and the next are treated 

 by 



LeConU.—ln Trans. Amer. Ent. Soc, VI, 1877, 249-252. 

 Fauvel.—ln Bull. Soc. Linne., II, 1878, 167-188. 

 The following genera of the subfamily are probably represented 

 in the State : 



KEY TO INDIANA GENERA OF PIESTINjE. 



a. Abdomen not margined. 



1). Tarsi 5-jointed ; front coxa- separated. LXXXVIL Lispinus. 



blj. Tarsi 3- jointed ; front coxa? contiguous. LXXXVIII. Glyptoma. 

 aa. Abdomen margined; tarsi 5-jointed; front coxa- contiguous. 

 c. Front tibia? not spinose. 



d. Abdomen widely margined. Triga. 



r/(7. Abdomen very finely margined. Eleusis. 

 cc. Front tibiae with spinules ; body much flattened ; front impressed, 



horned in male. Siagonium. 



LXXXVIL Lispinus Erichs. 1840. (Gr., "clean.") 



Very slender species having the head directed for- 

 ward ; antenna? not longer than head and thorax ; 

 mandibles small, not toothed ; thorax subquadrate ; 

 - elytra truncate. (Fig. 171.) One species has been 

 taken and another may occur in the State. 



KEY TO INDIANA SPECIES OF LISPINUS. 



a. Black or piceous, shining; legs reddish-brown; front not 



impressed ; length 4.3-4.5 mm. linearis. Fig. 171, Lispinus 



angustatus Erichs. X 



art. Chestnut brown; front with two> shallow impressions; 7. A Madagascar spe- 



.. cies. (After Erich- 

 length 2.5 mm. 932. exiguus. son) 



