402 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



out in about thirty days and after moulting five times, reach the 

 adult stage in about forty-six days, or say seventy-five days for all 

 the transformation. There seems to be only one brood in a 

 summer, however, as the eggs are deposited some time in May, and 

 the females continue ovipositing into June. 



It is commonly distributed all over the United States except the 

 extreme West and South. 



West Thompson, 12 July, 1905 (H. L. V.) ; Ansonia, Aug., 1915 

 (B. H. W.). 



R. protensa Montandon. (fusca Bueno.) 



Bull. Soc. Sci. Buc, xviii, 185, 1910. 



This is a somewhat rare species in the East, but it has been 

 taken in New York and should doubtless occur in Connecticut. 

 Beyond the differential character mentioned in the key, it may be 

 stated that in general it is more slender in build than americana, 

 with shorter legs, breathing tube, etc. No details of habits or life 

 history of this species are known. 

 R. kirkaldyi Bueno. 



Can. Ent, xxvii, 187, 1905. 



This small species is readily separable from the other two larger 

 species, in addition to the characters of the key, by the much con- 

 stricted prothorax and much smaller size. Nothing is known of 

 its life history. 



It should be remembered that in this genus the female is both 

 larger and stouter than the male, with larger eyes and a sharp 

 ovipositor. Before this was known, species had been founded on 

 this difference in size of the eyes. 



This well-marked little species was first discovered in Putnam 

 County, New York, and has subsequently been found in New 

 Jersey. 



Family NAUCORIDAE. 



By J. R. DE LA TORRE-BUENO. 



This family, so important and extensive in the Old World and 

 so numerous in individuals and species in tropical America, is 

 represented in the Atlantic States by only one genus. The group 

 is nearly related to the Belostomatids ; in fact certain Oriental 

 representatives of both are very near in general aspect, and are 

 separable largely by technical characters. 



Pelocoris Stal. 



This genus has only one species. 

 P. femoratus Palisot de Beauvois. (PI. xvi, 3.) (Fig. 43.) 



Ins. Rec. Afr. Am., 237, pi. 20 f. 4, 1805. 



This is at times abundant in ponds with fine vegetation grow- 

 ing from the bottom, among which it hides, lying in wait for 



