224 KA.MIIA' IV. DYTlSCllVi:. 



XIV. Agabetes Crotch. 1873. (Gr.. "good + swimmer.") 



This genus contains l)nt one short, broad, depressed species hav- 

 ing the head somewhat flattened; thorax very short, with sides 

 rounded, not margined; prosternal spine with an acute carina. The 

 males have the anal segment deeply impressed each side, and the 

 front tarsal claws very long. 



434 (1405). Agabetb;s acuductx's Harr., New Eng. Far., 1828, 124. 



Oval, snbdepressecl. Blackish or piceous, feebly shining; head, side 

 margins of thorax and humeri of el.ytra reddish. Disk of thorax and sur- 

 face of elytra with very nvnnerous short scratches or impressions. Length 

 7-7.5 mm. 



Lake, Kosciusko and Knox counties; rare. April 29-Septem- 

 ber 2. 



XV. Ilvbtosoma Crotch. 1873. (Gr., "mud or slime -f body.") 



This genns comprises two medium-sized species having the hind 

 tibicV and tarsi very short; first tarsal joint shorter than the tilual 

 spur. The males have the front and middle tarsi compressed, nar- 

 rowly dilated; claws simple. One of the two, described from Can- 

 ada and l)elonging to the boreal fauna, occurs in northern Indiana. 



4.35 (1399). Ilybiosoma bifakia Kirby, Faun. Bor. Amer.. IV, 1837. 71. 



Oldong-ovate. subcimvex. Black, shining; head in front, antenna-. If.^s 

 and side margins of thorax roddish-brown. Elytra with numerous minuti' 

 longitudinal impressed lines wiiicii, Ix'hind the middle, are transverse. Length 

 (17 mm. 



Represented in the collection by a single specimen taken ncai" 

 Pine. Lake County. ]May 3. 



XVI. Agabus Leach. 1817. (Gr., a i)roper name.) 



A large number of blackish or more or less metallic, rarely varie- 

 gated beetles, ranging from 7 to 12 nun. in size and having the 

 thorax margined; prosternum often acutely carinate; claws of hind 

 tarsi ecpud; elyti-a usually very finel>' reticulate or alntaceous. Tlic 

 front tarsi of the males are swoUen, the joints beneath being clothed 

 with hairs which are usually tipped with minute disks. The hind 

 legs are rather fee])ly developed for swinuuiug. aiul the beetles are 

 therefore often found under stones in wet. grassy places, or about 

 the roots of semi-aquatic plants in mai'shes and shallow^ pools. 

 Movo than 50 species arc listed fi-oiii 1lic I'uilcd States. Of these, 

 10 ai'<» known from Indiana while sevei'al othci's doubtless occur. 

 On account of their close similarity th(\v are difficult to separate un- 

 less both sexes are at liand. 



