104 ENTOMOLOGICAL NEWS. [Mar., 716 
distinctly depressed just anterior to genital segment (as it is in 
buenoi), median ventral (second) emargination narrow, semicircular ; 
genital segment narrow, Fig. a. 
@. Lateral plates of genital segment together very slightly wider than 
long, widest at middle, carinate ventrally. 
Length from tip of tylus to apex of abdominal spines, ¢ 7.5-8 mm.; 
2 8-8.5 mm. 
Holotype (4) and allotype (taken in copulation) in my 
collection ; paratypes in the Museum of Comparative Zoology, 
Cambridge; Boston Society of Natural History; United 
States National Museum; and the Academy of Natural Sci- 
ences, Philadelphia. 
Described from 10 males and 16 females taken at Forest 
Hills, Massachusetts, 26 April, 4 May, 20 May, 1915, from a 
woodland pond where it was associated with G. marginatus 
Say and G. buenoi Kirk. A female specimen from Southern 
Pines, North Carolina, 15 March, 1915 (Manee) belongs to 
this species. This form pertains to the subgenus Gerris. It is 
distinguished from G. buenoi and G. marginatus by the white 
markings at the base of the hemielytra, the form of the geni- 
talia, Figs. a-c, and the marginal stripes of the anterior lobe of 
the pronotum which are not silvery in the former and lacking 
in the latter. 
MIRIDAE. 
Heterocordylus malinus Reut. Durham, New Hampshire (No. 
2485, W. & F.). 
This is the most northern record for the species, and the 
first indication of its occurrence in New England. It is seri- 
ously destructive in New York, where it is known as the 
“apple red-bug.” 
Pithanus maerkeli H. S. Eastport, Maine, 15 July, 1909 (C. W. 
Johnson). 
In going over some unmounted material belonging to the 
Boston Society of Natural History, I recently came across 
seven brachypterous specimens of this European species, 
“which were taken by sweeping in a field. This record, 
the first for New England, indicates the establishment of the 
species in this country. It was first recorded by Olsen, from 
