232 



FAMILY I V.--I>YTIS('[T>/E. 



D. 'HKiff/iinilis Linn., I), sublvmbatus Lee. and D. dauricus Gebl., 

 are all bnivnl species which may occur in northern 

 Indiana. 



4. r >2 (141H). DYTISCUS HABBISII Kirby, Fauii. Bor. Anier. 

 1837, 76. 



Broadly oval. Thorax at base, apex arid sides broadly 

 bordered with yellow. Elytra with marginal stripe nar- 

 rowed (inly near apex, and with a narrow subapieal cross- 

 bar as in miicnUs. Abdominal segments reddish-yellow 

 margined with piceons. Length 38-40 mm. (Fig. 117.) 



Lake and Marion counties; rare. June 26. Our 

 Fig. ii7. Two-thirds largest and best marked species. The Marion Coun- 

 ty specimen is in the Dury collection. 



XX. HYDATICUS Leach. 1817. (Gr., ''found in the water.") 



Moderate sized, convex, regularly ovnl species having the thorax 

 not margined; prosternal spine with a rather broad oval expansion, 

 and obtuse or rounded at apex : hind tarsal claws unequal, the inner 

 one the longer. The dilated front tarsi of males bear numerous 

 subeqmil disks, the middle tarsi being also broadly dilated and with 

 four rows of disks. Three species have been taken in the State, 

 while another may occur. 



KEY TO INDIANA SPECIES OF HYDATICUS. 



. Kows of punctures on upper face of hind tibi;e distant from one an- 



other and parallel with outer border of tibia?. 



1>. Above reddish-brown : sides of thorax dull yellow. 453. PICEUS. 



lib. Above piceous; thorax reddish with a black basal cross-bar. 

 c. Elytra each with four or five narrow dull yellow lines. 



454. STAGNALIS. 



cc. Elytra uniform piceous. the margin only paler. 



455. L^VIPENNIS. 



<nt. Kows of punctures on upper face of hind tibia? rather close together 

 and not parallel with hind margins; thorax as in s 1a<jn ulix; elytra 

 with a submarginal yellow stripe, recurved at the humerus and not 

 reaching apex. BIMARGINATUS. 



453 (1479). HYDATICUS PICEUS Lee., New Sp. X. Amer. Col.. I, 1863, 23. 

 Oval, moderately convex. Dark reddish-brown; subopaque, front of 



head, margins of thorax and elytra paler; front and middle legs pale brown ; 

 hind legs and abdomen darker. Dorsal rows of punctures evident but indis- 

 tinct. Female with several irregular elongate punctures each side of mid- 

 dle of front of thorax. Length 12-13 mm. 



Lake and Wells counties ; scarce. April 29- June 25. 



454 (1477). HYDATICTS STAGNALIS Fab., Mant. I, 191. 



Ovate, subconvex. Above piceous: thorax and front of head reddish- 

 yellow. the former with a curved black basal cross-bar which does not reach 



