October, '10] DAVIS: ILLINOIS APHIDID.E 417 



cornicles. Eyes red. Antenna? as those of winged viviparous female as to relative 

 lengths of segments and coloration. (PI. 27, fig. 8.) Beak as in winged, legs also 

 as in winged, excepting the hind femora which are swollen the basal two-thirds and 

 bear many small inconspicuous circular sensoria. (PI. 27, fig. 9.) Coloration of 

 style and cornicles as given for the vi^'iparous. Abdomen more tapering and drawn 

 out at the posterior end. On the ventral lateral surface just beneath the cornicles 

 is a silverj' white patch which proves to be a mass of fine flocculent matter, from 

 glands beneath, and probably is used as a protection for the eggs mentioned below. 

 Measurements (average), length of body, 1.7 mm.; width, 0.8 mm.; antennae, I, 

 0.05; II, 0.05; 111,0.38; IV, 0.21; V, 0.19; VI, base, 0.115; filament, 0.098; total, 

 1.093 mm. Eggs. — They are deposited in the crevices at the buds and are more or 

 less covered with the silvery white flocculent matter found at the glands beneath the 

 cornicles mentioned above. When first deposited they are pale greenish, later 

 changing to jet black. 



Winged male. — Head and thorax dark brownish, sometimes prothorax with a 

 greenish tint. Abdomen pale yellowish green, with the green markings similar, but 

 less conspicuous than in the winged vi\-iparous female. Antennae entirely dusky, 

 12-14 rather large circular sensoria in*a row on III, 5-7 on IV, and 3-5, — together 

 with the usual distal one, — on V, and the usual one at end of VI base. (PI. 27, 

 fig. 10.) Legs entirely dusky excepting joints and base of femur. .Cornicles and 

 eyes and wings as in winged female. Styles dusky. Measurements (average): 

 length of body, 1.2 mm.; width, 0.49 mm.; antenna I, 0.055; II, 0.065; III, 0.46; 

 IV, 0.29; V, 0.25; VI, base, 0.12; VI, filament, 0.105; total, 1.345 mm. 



Cal. asclepiadis Monl.: Bull. U. S. Geol. and Geog. Surv., Vol. 5 

 (1879), p. 29; Oestlund, Bull. Geol. and Nat. Hist. Surv., Minn., 

 No. 4 (1887), p. 42. Found abundant on the common Asclepias, 

 throughout the state. First reported by Gillette. 



*Cal. hellus Walsh: Sanborn, Kans. Uni. Sci. Bull., Vol. 3 (1904), 

 p. 40, figs. Common throughout the state on oak. 



Cal. betulcecolens (Fitch) Monl.: Bull. U. S. Geol. and Geog. Surv., 

 Vol. 5 (1879), p. 30; Davis, Annals Ent. Soc. Amer., Vol. 2 (1909), 

 p. 30, figs. Especiallj^ abundant on the American and European 

 hndens in the Chicago parks. At Elgin, 111., this species was exception- 

 ally abundant, the upper surfaces of the hnden leaves being coated 

 with honey dew, and the aphids, when disturbed, arose from the 

 leaves in small swarms giving the general impression of a flight of 

 small leaf hoppers, such as Empoasca mali. First reported by the 

 writer. 



* Cal. caryce Monl. : Bull. U. S. Geol. and Geog. Surv., Vol. 5 (1879), 

 p. 31. A species occurring everywhere throughout the state on hickory 

 and walnut. 



^Cal. carycefolioe Davis: Ento. News, Vol. 21, May (1910), pp. 

 198-200, 1 pi., 1 fig. F irst reported by the WTiter. 



* Callipterus {MyzocalUs coryli Goetze : This species has been 

 taken occasionally on the wild and cultivated hazel shrubs, infesting 



1 See note under Pterocallis on a preceding page. 



