902 FAMILY XXIX. — MIRID^E. 



KEY TO COLOR VARIETIES OF DER^EOCORIS SAYI. 



a. Scutellum pale or red. 

 b. Side margins of pronotum black or only narrowly pale at apical 

 angles ; front of head blackish. 999a. var. frontalis. 



bb. Side margins of pronotum broadly pale or reddish. 



c. Embolium black like the corium. 999b. var. margixatus. 



cc. Embolium pale and cuneus more or less translucent. 



999c. var. costalis. 

 aa. Scutellum black or only the median line pale apically. 

 d. Femora black, annulated with pale near apex. 



999d. var. unicolor. 



dd. Femora pale on basal half, broadly annulated with black at apical 



third. 999e. var. femoralis. 



Of these varieties Knight records frontalis from Glen Ellyn, 

 111.; costalis from Massachusetts, New York and Illinois; uni- 

 color from Illinois and Wisconsin ; marginatus from Michigan, 

 Illinois, Georgia and Florida, and femoralis from Minnesota. 



Group D. — Der^eocoris. 



Oblong or elongate-oval species of medium size having the 

 scutellum smooth and tarsal claws without distinct cleft at 

 base. This group comprises six of our eastern species. 



KEY TO EASTERN SPECIES OF GROUP D, DER^OCORIS. 



a. Upper surface practically glabrous, at most only finely and sparsely 



pubescent. 



b. Calli solid black or with only a small pale spot on each outer apical 



angle. 



c. Scutellum uniformly brownish; second antennal similar in both 



sexes, slender on basal half, thicker toward apex, its erect hairs 



as long as thickness of segment; apical half of hind tibiae 



broadly pale. 1000. appalachianus. 



cc, Scutellum dark brown with basal angles and apex ivory-white; 



second antennal as thick at middle as on apical half, its erect 



hairs in female three times as long as thickness of segment; 



apical half of hind tibia? dark brown with a vague median pale 



ring; host plant, tamarack. 1001. laricicola. 



bb. Calli with entire front margin ivory-white, this hue with a spur 



projecting obliquely inward from each apical angle toward middle 



of callus; second antennal as thick at middle as on apical half, 



its erect hairs not longer than thickness of segment; host plant, 



white pine. 1002. pinicola. 



aa. Upper surface thickly pubescent or at least with long hairs near 



front angles of pronotum. 



d. Hind femora with basal half pale flecked with two or three rows of 



small darker spots; apical half fuscous to blackish with a pale 



ring; tibiae with two pale rings. 1003. kennicotti. 



