418 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 3 



the under surfaces of the leaves, in and about Chicago. In Monell's 

 table ^ this species comes nearest to C. hetulcecolens from which it may 

 be readily distinguished by its smaller size, the pale wing veins, 

 shorter filament in comparison with the base of VI, etc, C. coryli 

 was once before reported from the United States, by W. T. Clarke, 

 who collected it in California ^. 



Winged viviparous female. — Entire body, including head, (PI. 28, fig. 11) pale 

 yellow. Antennae whitish excepting the tips of III, IV, V, distal half of base VI, and 

 filament VI; segment III longest, it being fully a half longer than IV, IV, V, and 

 filament VI subequal, but IV being invariably slightly the longest of the three, 

 VI base being less than half the length of VI filament; three or four large but incon- 

 spicuous circular sensoria near the base of III, and the usual ones at the distal ends 

 of V and VI base. (PI. 28, fig. 12.) Eyes white from above and reddish from below. 

 Beak reaching to the coxae oi the second pair of legs. Legs pale (whitish) excepting 

 the pale dusky distal end of tibia and blackish tarsus. Cornicles concolorous with 

 body; longer than wide but the length less than twice the breadth. (PI. 28, fig. 14.) 

 Style concolorous with body and knobbed. Anal plate conspicuously bifid. (PI. 28, 

 fig. 15.) Measurements (average): length of body, 1.1 mm.; width, .046 mm.; 

 length of wing, 1.8 mm.; width, 0.7 mm.; antenna I, 0.055; II, 0.065; III, 0.42; 

 IV, 0.26; V, 0.20; VI, base, 0.105; VI, filament, 0.23; total, 1.335 mm.; cornicles, 

 0.065 mm.; style, 0.05 mm. Pupa, entirely pale yellow. 



Wingless oviparous female.- — Entire body pale yellowi-sh. Eyes reddish. Antennae 

 pale whitish, excepting extreme distal end of III and the remaining segments, which 

 are more or less dusky. Comparative measurements as winged viviparous. (PI. 28, 

 fig. 16), Legs'pale whitish excepting distal end of tibia and the tarsus, which are 

 dusky, hind tibia swollen and bearing rather inconspicuous sensoria on the basal 

 two-thirds, (PI. 28, fig. 17). Entire body covered with rather long capitate hairs; 

 on the dorsum is a longitudinal row of tubercules, bearing hairs. Abdomen pro- 

 longed at the posterior end. Cornicles and style concolorous with the body. Meas- 

 urements (average): length of body, 1.5 mm.; width, 0.7 mm.; antenna I, 0.05; 

 II, 0.04; III, 0.26; IV, 0.16; V., 0.145; VI, base, 0.09; VI, filament, 0.20; total, 

 0.945 mm.; cornicles, 0.08 mm. 



Winged male. — Head dusky with a faint dark greenish tint; pro thorax yellowish 

 with a median longitudinal marking concolorous with head. Thoracic shield shining 

 dark greenish, and abdotnen pale yellowish with a median row of short wide transverse 

 black markings and a row of inconspicuous dusky spots on each side. Antennae as 

 follows: I and II dusky, III pale, and dusky at distal end, the remaining segments 

 dusky to blackish; 17-18 roundish oval irregularly placed sensoria on III, 3-5 in a 

 row on IV, 3-5 on V, and 1-3 on base VI, as well as the usual ones at the distal ends 

 of V and base VI; III longest, it being more than a half longer than IV and about 

 twice the kngth of VI filament, IV and V subequal, the former being invariably 

 slightly the longer, VI base about one half the length of the filament which is sub- 

 equal to or slightly less than the length of V. (PI, 28, fig. 18.) Wing veins slightly 

 darker than the female. Legs pale or shghtly dusky, excepting the darker distal 

 end of the tibia and the tarsus. Cornicles and style dusky. Measurements (average) : 

 length of body, 1.0 mm.; width, 0.35 mm.; length of wing, 2.25 mm.; width, 0.71 mm.; 

 antenna I, 0.05; II, 0.05; III, 0.42; IV, 0.24; V, 0.215; VI, base, 0.10; VI, fila- 

 ment, 0.215; total, 1.29 mm. 



^Loc. cit. 



"A list of California Aphidida, Can. Ent., Vol. 35 (1903), p. 248. 



