658 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



the corium ; corium fuscous on basal half, a tranverse pale spot at 

 middle, behind this dark fusco-brownish as far as a line drawn 

 transversely through tip of clavus, apical area pale brownish, some- 

 what translucent and shining, more pruinose bordering the trans- 

 verse dark band ; cuneus uniformly brownish translucent. 

 Membrane uniformly fusco-brownish, veins slightly darker. 



Legs : Uniformly dark brown, hind coxae with a pale or yellow- 

 ish opaque spot on antero-lateral angle ; femora coarsely aluta- 

 ceous, sparsely clothed with erect pale hairs ; hind tibiae 

 compressed, strongly curved, beset with yellow spine-like hairs ; 

 tarsi fuscous, brownish at base. 



Venter : Black with a tinge of brown, moderately shining ; 

 strongly constricted at base, a pale mark on side just beneath that 

 of corium ; ventral aspect sparsely set with erect pale hairs. 



Female: Length 5.5 mm., width before base of cuneus 1.59 mm. ; 

 very similar to the male in form and coloration, abdomen broader 

 apically. Head: Width 1.32mm., vertex .58mm. Antennae: 

 Segment i, length .54 mm.; ii, 2.1mm., slender on basal half, 

 clavate apically (.114 mm. thick), exceeding thickness of segment i. 



Holotype: Male, 14 July, 1906, Staten Island, N. Y. (Wm. T. Davis) ; 

 author's collection. Allotype : Female, Aug., Central Park, Long Island, 

 N. Y. (Wm. T. Davis). 



This species is more closely related to Fiebrigiella silvestri Popp., 

 described from Brazil, than to Barberiella formic oides Popp., but 

 differs from the former at least in the longer antennal segment i 

 and by the shining, brownish translucent apical area of corium and 

 embolium. The members of this genus are very good ant mimics, 

 and in general aspect very suggestive of large species of 

 Pilophorus. 



Family GERRIDAE.* 



By J. R. DE LA TORRE-BUENO. 



The water striders are familiar objects on the surface of ponds 

 and streams, gliding about on their long spider-like legs like grace- 

 ful skaters on a sheet of ice. They form perhaps one of the 

 largest of the families of semiaquatic Heteroptera. They differ, 

 as the key has shown, from all other Heteroptera in having sub- 

 apical claws ; that is, inserted in more or less of a cleft at some 

 distance from the apex of the last tarsal segment. 



The divisions of the family are shown in the following key to 

 tribes of Gerridae. 



* This family should follow the Veliidae but in paging the manuscript it 

 was inadvertently placed after Miridae. The Miridae was nearly all^ in 

 page form before the error was noticed, and to correct it, meant changing 

 several hundred pages and figure numbers, to say nothing of recasting the 

 pages of the Miridae. W. E. B. 



