700 FAMILY XXIX. — MIRWJE. 



following Knight (1923, 615), separated into four groups, as 

 follows : 



KEY TO GROUPS OP EASTERN SPECIES OF PHYTOOORIS. 

 a. Membrane of elytra speckled or irrorate with small fuscous and pale 

 spots ; median lobe of male genital structure provided with a flagel- 

 lum (fig. 16) s " without or rarely (junceus) bearing distinct teeth. 



Group I, p. 700. 

 an. Membrane either uniformly fuscous, nearly pale, or marbled with 

 pale, never distinctly speckled, but the margins of fuscous areas 

 sometimes with small pale dots; median lobe of male genital struc- 

 ture with a flagellum bearing distinct teeth (fig. 1). 

 b. Basal joint of antennas shorter than width of head. 



Group II, p. 711. 

 bl>. Basal joint of antenna? distinctly longer than width of head. 



c. General color fuscous or blackish on a paler background ; antenna? 

 more blackish or fuscous than pale, if joint 2 broadly pale at 

 middle then the dorsum chiefly fuscous to blackish. 



Group III, p. 714. 

 cc. General color usually yellowish to reddish over a paler back- 

 ground ; antenna? more nearly pale-yellowish or reddish, than 

 blackish, joint 2 sometimes fuscous at apex and near base, but 

 more pale than fuscous. Group IV, p. 724. 



Group I. — Phytocoris. 



In this group the membrane of elytra is irrorate or flecked 

 with small fuscous pale dots; the basal joint of antennae is 

 variable in length, but always longer than the width of head 

 across the eyes. It corresponds to Group I of Knight in the 

 "Hemiptera of Connecticut," and comprises 17 of our eastern 

 species. They occur mainly in crevices in the bark of the 

 trunks of trees and are probably largely predaceous in habit. 



KEY TO EASTERN SPECIES OF GROUP I, PHYTOCORIS. 



«. Basal joint of antenna? greatly thickened, cylindrical, its thickness 

 nearly equal to dorsal width of an eye. 

 b. Joint 2 of antenna? yellowish, its apical fourth blackish; joint 1 

 slightly longer than head and pronotum united, thickly clothed 

 with long inclined black hairs; form elongate, subparallel; length 

 7.5 — 8.5 mm. 683. lasiomerus. 



bb. Joint 2 of antenna? uniformly yellowish, scarcely dusky at apex. 

 c. Basal joint of antenna? with two distinct types of hairs, erect 

 black bristle-like ones with shorter more recumbent sparsely set 

 black ones between them; scutellum reddish each side of median 

 line, clothed with silky white pubescence. 



684. PALLIDICORNIS. 



S0 The figures of male genitalia cited under certain species of Phytocoris refer to 



those on Plate XI, p. 712. 



