510 On Aquatic Carnivorous Coleoptera or Dytrscide. 
Group 9. 
Hind coxze moderate or rather large, wings of metasternum moderate ; prosternal 
process acuminate, compressed, finely margined ; swimming legs moderately stout ; 
middle claws of front feet rather lone ; elytra marked with yellow. 
Five species from both Old and New Worlds. 
701. Colymbetes teniolatus, Harris, Agabus teniolatus, M.C.—Ovalis, sat con- 
vexus, nitidus, rufus, vertice et prothorace anterius et posterius znescentibus, elytris 
testaceis, lineis longitudinalibus latis plus minusve confluentibus zeneis ; supra fere 
levigatus. Long. 9, lat. 4¢ m.m. 
The male has the basal joints of the front tarsi (especially the first one), a little 
thickened, and furnished beneath with rather short hairs which bear small palettes, 
the claws are somewhat elongate and the anterior one has a small tooth near the 
base ; the middle tarsi are scarcely thickened but the basal joint is extremely 
elongate, its length considerably exceeding that of the longest of the two apical 
tibial spurs ; the intermediate tibize have their inner edge much emarginate. 
North America, (Pennsylvania). 761. 
702. Agabus (Gaurodytes) disintegratus, Crotch, Tr. Am. Ent. Soc. [V, p 416.— 
Ovalis sat convexus, nitidus, rufus, pectore coxisque posterioribus nigricantibus, 
vertice et prothorace anterius et posterius enescentibus, elytris testaceis, lineis 
longitudinalibus vel discretis vel confluentibus eneis ; supra fere levigatus. Long. 
84, lat. 4¢ m.m. 
The male has the basal joints of the front and middle tarsi a little thickened, 
and furnished beneath with rather short hairs which bear small palettes; the claws 
of the front feet are somewhat elongate and the anterior one has a small tooth 
near the base ; the basal joint of the middle tarsus is somewhat elongate, slightly 
exceeding in length the tibial spurs ; the tibize are quite simple. 
The species is readily distinguished from Colymbetes teeniolatus, by the undersur- 
face being more or less black, and by the different intermediate legs in the male, and 
it also has the side wings of the metasternum rather larger. The specimens before 
me show considerable variation in size and form and markings, and even in some of 
the structural characters; the material before me does not enable me to feel certain 
whether all should be referred to one species or not; but I am inclined to think 
this is a species forming more or less localized varieties. 
North America. (Kansas, Arizona, Pennsylvania. Nebraska, Canada ; sec. Crotch). 762. 
