49 6 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



D. sayi (Reuter), typical. 



Enarnwsus sayi Reuter, Ofv. Kongl. Sv. Vet.-Akad. Forh. xxxii No o 

 76, 1876. 



1 8th Rept. State Ent Minn., 175, 1921. 



Length 74-7. .9 mm., width 34-3.8 mm. ; distinctly hairy; black, 

 scutellum and front of head pale to reddish (fig. 65). 



Occurs on oak (Quercus sps.). 



New York. 

 D. sayi var. costalis Knight. 



1 8th Rept. State Ent. Minn., 177, 1921. 



Similar to the typical sayi but differs as indicated in the key; 

 hemelytra with costal margin and cuneus largely pale, lateral 

 margins of pronotal disk also pale. 



Massachusetts. 



Key to Species and Varieties of Group E. 



1. Head except tylus, pronotum, scutellum, and hemelytra except 



apex of cuneus, reddish typical ruber 



Hemelytra or pronotum, or both, more or less blackish 2 



2. Hemelytra reddish, pronotal disk black or largely blackish 



ruber var. bicolor 

 Hemelytra and pronotum more or less blackish 3 



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



apically, reddish ruber var. danicus 



Pronotum, scutellum, hemelytra except narrowly at base of embo- 

 lium and corium, black 4 



4. Cuneus reddish on the basal half ruber var. segusinus 



Cuneus entirely black ruber var. concolor 



D. ruber Linnaeus, typical. 



Cimex ruber Linnaeus, Syst. Nat., Edn. 10, 446, 1758. 

 1 8th Rept. State Ent. Minn., 191, 1921. 



Length 7.2 mm., width 3.4 mm.; tylus strongly compressed, 

 outline of head appearing nearly triangular when viewed from 

 above ; antennal segment ii slender on basal half but thickened 

 apically; head except tylus, pronotum, scutellum, and hemelytra 

 except of cuneus, reddish; membrane infuscated (fig. 66). 



Predaceous on plant lice (Aphididae). 



New Haven, June (B. H. W.) ; Stamford, 24 June, 1919 (E. D. Brown). 

 *D. ruber var. bicolor Knight. 



1 8th Rept. State Ent. Minn., 193, 1921. 



Similar to the typical variety except that the pronotum is black ; 

 sometimes the lateral margins of the disk and the slender median 

 line reddish. 



Hartford, 26 June (W. Marchand) ; New Haven, 30 June, 1 July 

 (M. P. Z.). 



D. ruber var. danicus Fabricius. 



Lygaeus danicus Fabricius, Ent. Syst., iv, 181, 1794. 



1 8th Rept. State Ent. Minn., 193, 1921. 



Head reddish, tylus and a mark extending from dorsal margin 



