212 



FAMILY IV. DTTISCIMJ. 



401 ( ). Hydeovatus indianensis sp. nov. 



Form of the preceding. Head and under surface reddish-brown ; thorax 

 piceous with a median cross-bar reddish-brown ; elytra piceous, each with 

 a broad reddish-brown sub-basal spot, a small spot behind middle and the 

 tips also indistinctly reddish. Thorax and elytra sculptured as in pustu- 

 lates. Length 3 mm. 



Kosciusko County; rare. August 5. A distinctly larger and 

 much darker form than the preceding. 



V. Desmopachria Bab. 1841. (Gr., ' ' band + point. ' ') 



In this and the next genus the hind coxae are united firmly to 

 the ventral segments so that the under surface of the body from the 

 front of the metasternum to the hind margin of the third ventral 

 segment consists of one rigid piece. Desmopachria comprises mi- 

 nute, short, broad species, convex both above and beneath and hav- 

 ing the hind coxae very greatly developed but with the coxal cavi- 

 ties much exposed. The genus is represented in the eastern United 

 States by a single small species. 



402 (1262). Desmopachria convexa Aube\ Spec. Gen.. VI, 1838, 479. 



Rounded, convex. Uniform brownish-red. shining. Elytra finely but 

 distinctly punctulate. tapering to an obtuse apex. Clypeus with a distinct 

 margin. Length 1.7 mm. 



Laporte, Marshall, Wayne and Marion counties ; frequent. Oc- 

 curs beneath grass roots along the margin of water. May 15-Au- 

 gust 15. 



VI. Bidessus Sharp. 1882. (G'r., "double + wet.") 



This genus contains a number of very small oblong- oval de- 

 pressed beetles, usually of a brownish color with paler markings. 

 The thorax has a basal groove or longitudinal fold on each side 

 which is often continued onto the elytra. Five species are known 

 from Indiana. 



KEY TO INDIANA SPECIES OF BIDESSUS. • 



a. Basal grooves of thorax not continued onto elytra; elytra brown, each 

 with two yellow spots. 403. flavicollis. 



aa. Basal grooves of thorax continued onto the elytra. 



h. Elytra distinctly pubescent with yellowish hairs. 404. pulicarius. 

 l)b. Elytra not or very finely pubescent. 



c. Elytral portion of basal groove distinctly longer than the thoracic 

 portion. 405. lacustris. 



cc. Basal groove about erpially divided between thorax and elytra, or 

 distinctly longer on the former. 



