894 FAMILY XXIX. — MIRID^. 



tate, clavus more coarsely and rugosely so; costal margins parallel on 

 basal two-thirds, thence feebly rounded to apex. Tarsal claws and 

 arolia as in pi. X, fig. 30. Length, 7.2 — 8 mm. 



Brooklyn, N. Y., July 14, on rose (Paris). An introduced 

 European species recorded in this country only from Massa- 

 chusetts, Connecticut, New York and Pennsylvania. As far as 

 known it is predaceous in habits, without definite host plant. 

 Douglas & Scott (1865, 442) mention it as: "Common every- 

 where in the London district on nettles and bramble flowers in 

 July and August." 



The form above described is that of typical ruber. Of the 

 varieties Knight (1921, 194) says: "All the varieties of ruber 

 are merely melanic color forms, each particular color phase be- 

 ing an index to the conditions of environment under which the 

 bug developed." Probably the best marked one is var. segusinus 

 Muller (1766, 191), which Davis found at Staten Island, N. Y.. 

 July 10, on red raspberry. 



Group B. — Der^eocoris. 



Elongate-oval, glabrous robust species with the width less 

 than one-half the length ; ground color generally dull grayish- 

 yellow, marked with fuscous punctures or blotches ; scutellum 

 smooth ; hind tibiae spinose in front ; tarsal claws deeply cleft 

 near base. This group comprises nine species and two color 

 varieties from the eastern states. All but two of the species 

 have been described since the Van Duzee Catalogue was issued. 



KEY TO EASTERN' SPECIES OF GROUP B, DER.EOCORIS. 



a. Tibia? banded or spotted with fuscous-brown or pale, rarely (bore- 



alis) wholly dark without distinct bands. 



b. Membrane with a large rounded fuscous spot on apical half, this 



frequently united at base with a fuscous streak which extends 



down from between the cells, thus leaving a large pale spot each 



side of middle and bordering apex of cuneus. 



c. Calli usually solid black with a broad piceous ray behind each, in 



pale specimens somewhat brownish with the rays behind them 



dark brown or wanting, the pronotal disk then with a narrow 



median line and margins pale; clavus and corium in part piceous, 



embolium pale; host plant, alders. 990. borealis. 



cc. Calli more or less brownish or pale without distinct rays behind 



them; elyti'a and pronotum more uniformly colored, either 



brownish-yellow or dark brown; host plants, apple, pear and 



Crataegus. 991. FASCIOLUS. 



bb. Membrane usually somewhat infuscated, but without spot and 



streak as in b. 



