THE SHORT-WIXGED SCAVHXOKP. BEETLES. 449 



not wider than elvtra. sides gradually narrowing from base to apex. Ely- 

 tra as wide as long, both they and abdomen sparsely punctulate and pubes- 

 cent. Length i.'j-S mm. 



Throughout the State; common. Jarmary 7-November 1. Oc- 

 curs beneath bark, dead leaves, etc., in open woodland. 



LXIY ERciiojrrs :M(its. 1S.".S. (Gr.. "to enter.") 



Very small black or pieeoits species, having the mesosternum 

 earinate, and front tarsi of male simple. Two of the four known 

 species occur in the State. 



*S02 (2644). Erchomus vextkicxlus Say. Trans. Amer. Phil. Soc, IV, 

 ]834. 4(10; ibid. II, .-,82. 

 Short, broad, convex, narrowed behind. Black, strongly shining ; elytra 

 and abdomen with a reddish-piceous tinge; antennae and legs dark reddish- 

 brown. Thorax twice as wide as long, as wide at base as elytra ; very finely 

 and sparsely punctate. Elytra together one-third longer than wide, one- 

 half longer than thorax, finely but distinctly punctate. Abdomen, as ex- 

 posed, shorter than elytra, minutely punctulate. Last ventral of male with 

 a semicircular notch. Length 2-2.5 mm. 



Throughout the State; common. April 5-Deeember 25. Occurs 

 in eolimies beneath bark, especially that of elm and red oak. 



S(;.3 (2(;4.>). Eechomus l^evis Lee, X. Sp. X. Amer. Col., I. lSii3, 31. 



Similar to reiitriculus in form and color. Differs in having the upper 

 surface wholly smooth and last ventral of male triangularly notched. Length 

 2-2..!) mm. 



Posey Counly; rare. April IS. Occurs beneath dead leaves. 

 A member of the Austroriparian fauna. 



LXV CoxosoM.N Kraatz. 1S38. (Gr., "cone -i- body. ") 



The lack of a margin on the sides of the abdomen especially dis- 

 tinguishes this genus from all others of the tribe. The specias are 

 of small size, brov.'n, piceous or black in color, and the segments of 

 the abdomen are in death usually telescoped so that the abdomen a,s 

 exposed extends but little beyond the el.vtra. 



KEV TO INDIANA SPECIES OF COA'OSOMA. 



o. Mesosternum not earinate but obtusely elevated: body subdepressed. 

 6. Thorax piceous. hind angles broadly reddish-.vellow. LiTTOREtM. 



66. Thorax dull yellow, apical half or third piceous. 804. kxoxii. 



(Id. Mesosternum distinctly earinate. 



r. Middle tibise with only one terminal spur. 

 (I. Body robust, cunvex; hind angles broadly rounded; elytra piceous. 

 usually narrowly paler along the base. SO-j. ceassum. 



