210 



FAMILY TV. DVTJSCTDiR. 



397 (1244). Laccophilus pboximus Say, Trans. Amer. Phil. Soc, II, 1823, 



101 ; ibid. II, 514. 



Ovate. Elytra nearly uniform dark reddish-brown, with only traces 

 of the greenish-yellow spots of maculosus. Beneath darker than in that 

 species. Length 4.5 mm. 



Laporte, Marshall, Marion and Lawrence counties ; frequent. 

 April 11-August 20. 



398 (1248). Laccophilus fasciatus Aube, Spec, VI, 1838, 423. 



Ovate, subdepressed. Head, thorax and under parts dnll brownish- 

 yellow ; elytra greenish-yellow with a broad blackish bar behind the mid- 

 dle. Thorax and elytra finely alutaceous, the latter rounded at apex. 

 Length 5 mm. 



Throughout the State ; frequent. April 4- August 12. The 

 meso- and metasterna are often fuscous. 



399 (1253). Laccophilus undatus Aube, Spec. Gen., VI, 1838, 435. 

 Narrowly oval. Head, thorax and under parts reddish-yellow; elytra 



blackish with a rather broad, irregular basal and a narrower subapical 

 cross-bar, yellowish ; also a spot on the margin about the middle and at 

 apex of the same hue. Elytra very finely and rather closely punctate. 

 Length 4.7 mm. 



Fountain County and Pine Lake, Laporte County; scarce. July 

 21-August 15. The pale basal cross-bar varies in width and usu- 

 ally encloses two small squarish black spots on each elytron. 



Subfamily II. COMPLICATA. 



This group contains by far the greater number of the species 

 belonging to the family. All agree in having the middle coxal 

 cavity enclosed by four distinct pieces. The beetles vary much in 

 form and size, and exhibit the most perfect development of the oar- 

 like hind legs. Four tribes occur in the North American fauna, all 

 of which are represented in Indiana. 



KEY TO TEIBES OF COMPLICATA. 



a. Prosternum deflexed or bent downward between the front cox<e, so that 

 the process or spine is on a different plane from that of the pro- 

 sternum ; front and middle tarsi four- jointed, except in Celina; length 

 less than 6 mm. Tribe I. Hydbopobini, p. 211. 



aa. Prosternum not deflexed ; all the tarsi distinctly five-jointed. 



1). Lower spur of hind tibire not or but little broader than the other. 

 c. Outline of eye in front notched by the free margin of front of 

 head; front tarsi of males with three (two in Agabinus) basal 

 joints dilated, forming an oblong or elongate surface ; length 

 usually 7 or more mm. Tribe II. Colymbetini, p. 221. 



cc. Outline of eye not notched ; front tarsi of males dilated so as to 

 form a rounded or triangular disk; hind tarsi (except in Hy- 

 datieus ) with two nearly equal claws; length 10-40 mm. 



Tribe III. Dytiscini, p. 229. 



