SUBFAMILY VII. — DER^OCORIN^. 893 



aa. Scutellum impunctate. 



b. Tarsal claws deeply cleft near base. 

 c. Upper surface practically glabrous, at most only sparsely and 

 finely pubescent; hind tibiae with a row of spines or heavily chi- 

 tinized hairs on the front face; form elongate-oval. 



Group B, p. 894. 



cc. Upper surface heavily pubescent or hairy, at least with long hairs 



near the front angles of pronotum; hind tibiae without distinct 



spines on the front face, usually rather closely set with long 



prominent hairs. Group C, p. 901. 



bb. Tarsal claws not or very slightly cleft (pi. X, fig. 28). 



Group D, p. 902. 



Group A. — Der^eocoris. 



This group is represented in this country only by the Euro- 

 pean species Derceocoris ruber (Linn.) and four color varieties as 

 recognized by Knight. These he separated as follows : 



KEY TO SPECIES AND VARIETIES OF GROUP A, DER^OCORIS. 



a. Head except tylus, pronotum, scutellum and elytra except apex of 

 cuneus, reddish. 989. ruber. 



aa. Elytra or pronotum, or both, more or less blackish. 

 b. Elytra reddish, pronotal disk black or largely blackish. 



989a. var. bicolor. 

 bb. Elytra and pz - onotum more or less blackish. 



c. Pronotal disk largely, scutellum, corium and embolium, except 



apically, reddish. 989b. var. danicus. 



cc. Pronotum, scutellum, elytra except narrowly at base of corium 



and embolium, black. 



d. Cuneus reddish on the basal half. 989c. var. segusinus. 



dd. Cuneus entirely black. 989d. var. concolor. 



989 (1071). DERCEOCORIS ruber (Linnaeus) , 1758, 446. 



Rather broadly oval; glabrous, shining. Head dull yellow, tinged 

 with reddish, tylus brown or black; pronotum, scutelum, clavus and 

 corium straw-yellow, usually in part or wholly heavily tinged with red- 

 dish; embolium and outer margin of cuneus pale translucent yellow; 

 cuneus bright red, its tip black; membrane fuscous, a large spot opposite 

 tip of cuneus paler; legs dull reddish-yellow, femora, except apical fourth, 

 piceous, tarsi fuscous; ventrals and meso- and metasterna shining pice- 

 ous-black, their sides and prosternum reddish-yellow. Joint 1 of anten- 

 nae piceous, nearly as long as head; 2 three times as long as 1, piceous, 

 paler at middle, distinctly stouter toward apex, the clavate portion thick- 

 ly beset with inclined blackish bristle-like hairs ; 3 yellowish, dusky at 

 tip, two-fifths as long as 2 ; 4 dusky brown, one-half the length of 3. 

 Pronotum two and two-third times wider at base than apex, sides 

 straight, hind angles broadly rounded, basal margin sinuate; disk con- 

 vex, rather sparsely, finely and irregularly punctate. Scutellum sparsely 

 and finely punctate. Corium rather finely, closely and shallowly punc- 



