270 FAMILY VI. — HYDROPHILIDiE. 



XIX. Cryptopleurum Muls. 18M. (Cr., "'hidden + breast. ") 



This genus differs from Cercyon by having the prosternum ele- 

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

 widely separating the coxas ; mesosternum with a similar area widely 

 separating the middle coxa3; 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 CRYPTOPLEUEUM. 



«. Elytral intervals distinctly punctate througliout their entire extent; 



stria^ not conspicuously coarsely punctate. 529. minutum. 



aa. Elytral intervals feebly punctate on basal lialt' only; strite coarsely 



punctured at base. 530. americanum. 



529 (1(390). Ceyptoplevrum minutum Fab., Syst. Ent., 1798, 68. 



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

 I'iceous black, feebly shining; elytra with an indelinite pale space at tip; 

 antennte 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 puuctulate and sparse- 

 ly ])ubcscent. Length 1.5-2 mm. 



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

 l)er 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 mimituni in form and color ; antennsie and palpi pale red- 

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

 striate, striie coarsely and closely punctate near base, more finely on apical 

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

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

 2 mm. 



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

 Known heretofore only from Ohio. 



XX. PiL-ENONOTUM Sharp. 1882. (Gr., "to show -f back.") 



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

 club joints loosely united ; prosternum short, not carinate between 

 the coxae. 



531 (1685). Ph.idnonotum esteiatum Say, Bost. Journ. Nat. Hist., I, 171; 



ibid. II, 640. 

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

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



