No. 34.] HEMIPTERA OF CONNECTICUT: NOTONECTIDAE. 407 



Branford, 3 Aug., 1904 (H. L. V.) ; Windsor, 26 July, 1905 (W. E. B.) ; 

 New Haven, 24 Nov., 1910 (A. B. C.) ; Hamden, 24 Apr., 191 1 (B. H. W.). 



N. insulata Kirby. (PI. xvi, 8.) 



Richardson's Faun. Bor. Am., iy, 285, 1837. 



It has had other names, but they are of technical interest only. 

 Its color variability is great, and five varieties have been named. 

 It is the largest of our native species and has a fondness for cold 

 waters. 



Milford, 21 Mar., New Canaan, 3 Apr., 1919 (M. P. Z.). 



Buenoa Kirkaldy. 

 (Anisops, in part, for American species.) 



Key to Species. 



1. Small species, less than 6 mm. long 2 



Larger, more than 6 mm. long margaritacea 



2. Eyes large and prominent ; shape slender elegans 



Eyes large but not prominent ; shape more convex platycnernis 



B. margaritacea Bueno. 



Jour. N. Y. Ent. Soc. xvi, 238, 1908. 



{platycnemis Uhler, Stand. Nat. Hist, ii, 250, 1882; Bueno, Jour. N. Y. 

 Ent. Soc. x, 236, 1902.) 



This species is abundant all over the Eastern United States, and 

 frequents cold pools. Its food seems to be largely Entomostraca, 

 although occasionally it eats small insects. The anterior legs are 

 furnished with long spines, within which, as in a cage, Buenoa 

 holds its prey. In this, as in other waterbugs, there are five 

 nymphal stages, which give a life history from oviposition to adult 

 of some five or six weeks. 

 B. platycnemis (Fieber). 



Abh. Bohm. Ges. Wiss. (5) vii, 485, 1852. 



A species known from New York and New Jersey, but not thus 

 far recorded from Connecticut, many records under this name 

 belonging to margaritacea. 

 B. elegans (Fieber). 



Abh. Bohm. Ges. Wiss. (5) vii, 484, 1852. 



Known from New York where it is commonly taken along the 

 edges of ponds among grasses in clear places. 



Subfamily Pleinae. 



This subfamily is represented in the East by only one species, 

 which is common in Myriophyllum, among which it creeps. 

 Another has recently been described from Mississippi, and as so 

 little is known about this genus, it is included here. 



