SUBFAMILY VII. — DER/EOCORIN^. 895 



d. Beak reaching onto second ventral; membrane feebly or not at all 



inf uscated ; femora pale with two blackish bands on apical third ; 



basal half of hind tibiae with two fuscous bands ; host plant, 



hickory. 992. GRANDIS. 



dd. Beak reaching between hind coxa?; membrane, femora and hind 



tibiae without the combination of markings mentioned in d. 



e. Femora either wholly or with apical half uniformly dark; ven- 



trals either shining reddish or dark chestnut brown; host 



plants, yellow birch and mountain maple. 993. betul^e. 



ee. Femora with apical half distinctly banded or wholly pale. 



/. Second antennal sparsely beset with suberect hairs which are 

 three times as long as the thickness of the segment; pronotal 

 disk with margins and median line pale, calli and a broad 

 ray behind each of them black; vertex with a pale impressed 

 spot each side next to eye; host plant, hoary alder. 



994. ALNICOLA. 



//. Second antennal without long hairs; pronotal disk pale brownish- 

 yellow or fuscous without distinct rays behind the calli ; 

 corium with a spot at middle and outer apical angle fuscous; 

 host plant, elm. 995. aphidiphagus. 



aa. Tibiae uniformly pale or yellowish. 



g. Apical third of hind femora with two brown or fuscous bands; calli 

 with apical half pale or brownish and without distinct dark rays 

 behind them; elytra nearly uniformly brownish-yellow or dark 

 brown; membrane with a round brownish spot on apical half; 

 host plants, beech and apple. 991a. fasciolus var. castus. 



gg. Apical third of hind femora with but one fuscous band; apical half 

 of membrane pale or tinged with dusky but without a round fus- 

 cous spot. 

 h. Upper surface dull greenish-yellow to brownish, often marked with 

 fuscous or blackish, but never wholly dark brown or black; calli 

 pale margined with black or wholly black. 

 i. Calli with only the margins black; upper surface rich brownish 

 to fusco-brownish, shining; host plant, elm. 996. nitenatuS. 

 it. Calli wholly black, rarely (var. pollens) with only the margins 

 black. 

 j. Upper surface fuscous to blackish; pronotum and scutellum 

 usually with a pale median line; corium without distinct fus- 

 cous spots; host plant, white oak. 997. quercicola. 

 jj. Upper surface pale brownish-yellow; corium with three small 

 vague rounded fuscous or brownish spots, one at base, one 

 at middle, the third on outer apical angle; host plant, bur oak. 



997a. var. pallens. 



hh. Upper surface, including calli and scutellum, a nearly uniform 



dark brown or black. 998. davisi. 



990 ( — ). Der^eocoris borealis Van Duzee, 1920, 354. 



Color variable, usually pale brownish-yellow, marked with piceous or 

 brownish ; head pale with two lines on front, base and tip of tylus, dorsal 

 margins of lorae and a spot beneath each eye, brown or blackish; prono- 



