270 FAMILY VI. HYDROPHILID.E. 



XIX. CRYPTOPLEURUM Muls. 1844. (Gr.. " hidden + breast. ") 



This genus differs from Cere-yon by having the prosternum ele- 

 vated before the front coxa? to form a rather large, five-sided area 

 widely separating the coxa? ; mesosternum with a similar area widely 

 separating the middle coxa?; metasternal area broad, extending 

 across the body ; sides of thorax reflexed and angulate near middle, 

 the angle not visible from above. Two species are known, both of 

 which occur in Indiana. 



KEY TO INDIANA SPECIES OF CRYPTOPLETJEUM. 



(i. Elytra! intervals distinctly punctate throughout their entire extent; 



stria 1 not conspicuously coarsely punctate. 529. MINUTUM. 



. Elytra 1 intervals feebly punctate on basal half only; stria? coarsely 



punctured at base. 530. AMERICANUM. 



529 (1690). CRYPTOPLEURUM MINI TIM Fab., Syst. Ent., 1798. 68. 



Rather broadly oval, more narrowed behind than in front, convex. 

 Piceous black, feebly shining; elytra with an indefinite pale space at tip; 

 antenna 1 and palpi piceous. Thorax narrowed from base to apex, sides 

 feebly curved, surface rather coarsely punctate. Elytra rather deeply stri- 

 ate ; intervals slightly convex, closely and distinctly punctulate and. sparse- 

 ly pubescent. Length 1.5-2 mm. 



Kosciusko, Marion and Vigo counties ; scarce ; April 12-Octo- 

 ber 9. Taken in decaying fungi and beneath dead turtles and 

 chickens. In one specimen at hand the pale reddish space at apex 

 of elytra extends over three-fourths of the surface. 



530 (9339). CRYPTOPLEURUM AMERICANUM Horn. Trans. Amer. Ent. Soc.. 



XVII, 1890, 311. 



Resembles niiinttion in form and color; antennae and palpi pale red- 

 dish-yellow. Thorax more coarsely punctate than the head. Elytra deeply 

 striate. stria? coarsely and closely punctate near base, more finely on apical 

 half; intervals sparsely and finely punctate on basal half only. Metastenial 

 area more coarsely and sparsely punctured than in mlnutum. Length 1.7- 

 2 mm. 



Marion and Crawford counties; scarce. March 23-April 23. 

 Known heretofore only from Ohio. 



XX. PEL-ENONOTUM Sharp. 1882. (Gr., "to show + back.") 



Rather small black species having the antennae 9-jointed, the 

 club joints loosely united; prosternum short, not carinate between 

 the coxa?. 



531 (1685). PH^NONOTUM ESTRIATUM Say, Bost. Journ. Nat. Hist., I, 171; 



ibid. II, 646. 



Rather broadly oval, strongly convex. Piceous black, shining; antennae 

 dull yellow, the club fuscous. Thorax very finely punctate. Elytra more 



