228 



FAMILY IV. — DYTISCILVR. 



late, with the dorsal rows of punctures well marked and additional ones in 

 the intervals; of female opaque, more coarsely reticulate and without punc- 

 tures. All the tarsal claws short and weak. Length 6-7 mm. 



Lake and Laporte counties, beneath rubbish along the shores of 

 lakes ; scarce. May 25-October 21. 



Scutopterus angustus Lee, black, length 16 mm., is known from 

 Canada, Lake Superior and Kansas. 



XVII . R rr ant us Eseh. 1833. (Gr., "to wet or soak.") 



Medium-sized species having the thorax margined; last joint of 

 hind tarsi as short as fourth, with claws unequal. Males with front 

 and middle tarsi compressed, dilated, and with four transverse 

 rows of disks on under side. The following species have been 

 taken or may occur in Indiana : 



KEY TO INDIANA SPECIES OF EHANTUS. 



a. Claws of middle tarsi of male unequal, the outer one much longer than 

 the inner. 



h. Thorax with hind angles not prolonged ; elytra blackish with numer- 

 ous fine dull yellow markings. 

 c. Thorax with one or two median black spots ; length 11.5-12 mm. 

 d. Legs dull yellow ; discal spot of thorax divided by a narrow line. 



BINOTATUS. 



(tel. Femora black ; discal spot entire, transversely quadrate. 



FLAVOGKISEUS. 



cc. Thorax yellow, its front and hind margins black ; length 10.5 mm. 



446. BISTKIATUS. 



hit. Thorax with base deeply bisinuate. the hind angles prolonged, acute; 

 elytra wholly black or piceous ; length 10 mm. sinuatus. 

 aa. Claws of middle tarsi of male equal; upper surface entirely black; 

 length 12 mm. 447. confusus. 



B. binotalus Harr., and B. flavogriseus Crotch, both have a 

 range which may include northern Indiana. 



446 (1466). Rhaktus bistbiatus Bergst., Norn., I, 42. 



Rather shortly ovate. Head black, front and vertex dull yellow ; thorax- 

 yellow, its front and hind margins black ; elytra blackish, the margins and 

 many small reticulate marks dull yellow ; presternum and four front legs 

 reddish-brown ; remainder of under surface black. Outer middle claw of 

 male very broad, compressed. Length 9-10 mm. 



Beach of Lake Michigan, near Pine, Lake County; rare. May 

 5-June 28. 



B. sinuatus Lee., is known from New r York, Illinois and Mich- 

 igan. 



