216 FAMILY IV. "I )YT [SIMILE. 



414 (1297). CtELAMBUS NTBILUS Lee., Proc. Phil. Ac;id. Nat. Sci., ISO-j. 2!>s. 



Elongate-oval. Head, thorax, legs and anteume dull yellow ; elytra 

 with three or four irregular blackish streaks which sometimes merge to 

 form a fuscous cloud behind the middle; under surface black. Length 

 4..", mm. 



Known from Indiana by a single specimen taken near Green- 

 castle. Putnam f'ounty, by Guy Wilson and presented to the writer. 

 July 9. 



415 (1302). CCELAMBUS IMPRESSO-PUNCTATUS Schall.. Act. Hal.. I, 1783, 312. 

 Oblong-oval. Legs, head and apical half of thorax reddish-brown; ver- 

 tex, base of thorax and elytra dark brown, coarsely and deeply punctate. 

 .Many of the punctures elongate, continent; usually three impressed lines 

 on each elytron, reaching to about the middle. Length 5-5.5 mm. 



Lake, Laporte and Marshall counties; scarce. April 23-Aii- 

 gust 16. 



Dcroiici-lcs d< prcssus Fab., dull brownish-yellow, elytra with 

 black lines more or less confluent, length 4.5 mm., and D. griseostri- 

 dtiis, DeG.. black, densely punctate, the elytra often with narrow 

 greenish stripes or even entirely greenish-black, length 4.5 mm., 

 both range from New York and Canada to Michigan and westward, 

 and perhaps occur in northern Indiana. 



IX. HYDROPORUS Clairv. 180(i. (Gr.. "water + to walk.") 



To 111 is genus belong a large number of small species quite simi- 

 lar in general appearance and therefore difficult to distinguish. 

 They are mostly ovate in form, dark brown in color and have the 

 head never margined in front ; the prosternum never truncate 

 behind; swimming legs feeble. When captured in a water net, they 

 leap or spring a few inches at a time, much in the same manner as 

 do "click beetles/' The following species have been taken or may 

 occur in Indiana : 



KEY TO INDIANA SPKC1KS OF II YDKOPORVS. 



a. Hind coxnl cavities not contiguous. 

 l>. Elytra variegated in color. 



<-. 1'nder surface black or piceous ; form oval; length 3.5 mm. 



416. CONCINNUS. 



re. I'nder surface reddish- br<i\vn ; form broader, more obtuse in front, 

 more acute belli ! id ; length .",.7 mm. 1'i'i.enKU. 



l>l>. Klytra unicolorous. 



il. Under surface black or piceous: prosterual spine large. 



