240 i A M i L Y \ r . c, Y 



men darker. Elytra broad, tapering but little behind, tips subtruucate, 

 outer angle rounded; covering the entire abdomen (male) or leaving only 

 the tips exposed (female). Length 3.8-4.2 mm. 



Taken only along the borders of Wawasee and Hudson lakes, 

 where it was found in very large colonies. July 15-July 18. 



469 (1519). GYKINUS AFFINIS Aube, Spec. Gen., VI, 1838, 6G9. 

 Elongate-oval. Black, moderately shining; upper surface minutely alu- 



taceous, margins bronzed; beneath dusky bronzed, the last ventral seg- 

 ment reddish-brown. Elytra with tips more concave than usual, their 

 punctures flue, close-set. Length 6.5-7.5 mm. 



Putnam County; scarce. July 4. 



470 (- -). GYRINUS PICKOLUS sp. uov. 



Oval, moderately convex. Black, polished, the suture and side mar- 

 gins of elytra bronzed; under surface black, the last ventral paler; epi- 

 pleura and legs reddish-brown. Elytral punctures well marked, the outer 

 two rows coarser. Length 5.5 mm. 



Lake County; rare. May 5. 



471 (1521). GYRINUS ANALIS Say, Trans. Amer. Phil. Soc., II, 1823, 10S ; 



ibid. II, 520. 



Elongate-oval. Black, bronzed both above and beneath ; upper surface 

 not highly polished; beneath black, legs and last ventral segment reddish- 

 brown. Elytra with tips broadly but obtusely rounded. Length 5-6 mm. 



Throughout the State; common. April 11-October 23. 



472 (1527). GYRINUS BOREALIS Aube, Spec. Gen., VI, 1838, 692. 



Broadly oval. Above black, highly polished, margins and sides of ely- 

 tra bronzed; beneath black, the last ventral segment dark brown. Punc- 

 tures of elytral striae fine, rather close. Length 7 mm. 



Throughout the State; frequent. April 23-August 15. Re- 

 sembles vcntralis but broader and with under surface black. 



473 (1528). GYRINUS LUGENS Lee., Proc. Phil. Acad. Nat. Sci., 1868, 369. 

 Broadly oval. Resembles borealis, but above black, slightly polished, 



not at all bronzed; beneath black, the last ventral segment dark brown. 

 Elytra with tips more rounded and with outer angles less distinct; punc- 

 tures finer, more distant one from another. Length 6 mm. 



Lake and Laporte counties; scarce. May 20-July 15. 

 G. pcctoralis Lee., is a boreal species which may occur in north- 

 ern Indiana. 



TL DINEUTE* McL. 1810. (Or., "to whirl or swim in an eddy.") 



The speeies of this genus are all of fair size, more or less oval 

 and suhdepressed. Thr-y have the upper surface usually shining, 



