October, '10] DAVIS: ILLINOIS APHIDID.E 419 



* Cal. discolor Monl. : Oestlund, Bull. Geol. and Nat. Hist. Surv., 

 Minn., No. 4 (1887), p. 41; Weed, Psyche, Vol. 4, (1889) p. 131. A 

 common species on the oaks (Querciis spp.). 



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

 (1879), p. 25 (Aphis). First reported by Thomas. 



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

 (1879), p. 30. Not uncommon in IlHnois on oak. 



Cal. trifolii Monl.: Davis, Annals Ent. Soc. Amer., Vol. 1 (1908), 

 p. 256, figs. A common species on clover, but of little economic 

 significance. First reported by the writer. 



Cal. ulmifolii 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. Abundant on Uhnus americana throughout the year, 

 the sexual forms (winged male and wingless female), being common 

 in September and October. Although not usually considered injur- 

 ious to the elm, I have occasionally found them sufficiently common 

 to do injury, causing the foliage to drop prematurely and coating the 

 upper surfaces of the leaves with honey dew. First reported by 

 Gillette. 



^Calaphis hetulella Walsh: Proc. Ent. Soc. Phila., Vol. 1 (1862), p. 

 301. I have never taken this interesting species, but Walsh reported it 

 from Illinois in his original description. Mr. J. T. Monell has kindly 

 sent me specimens collected by him at St. Louis, Mo., on the leaves 

 of birch. Camera lucida drawings of the head, wing, cornicles, and 

 style are given in Plate 28, figures 19 to 23. 



* Monellia caryella Fitch: Oestlund, Bull. Geol. and Nat, Hist. 

 Surv. Minn., No. 4 (1887), p. 45. I have collected this species but 

 once, namely on hickory at Centralia, 111., August 13, 1907. 



Drepanaphis acerifolii Thos.: Sanborn, Kans. Uni. Sci. Bull., Vol. 

 3, No. 1 (1904), p. 45, figs. Common throughout the state on soft 

 maple and occasionally on hard and Norway maple but seldom in 

 such numbers as to be injurious. The winged males and wingless 

 females are quite common in September; the eggs being deposited in 

 the crevices at the buds, or cracks of the rough bark of the smaller 

 branches. First reported by Thomas. 



^Drepanaphis? minutus Davis: Ento. News, Vol. 21 (May 

 1910), pp. 195-198, 1 pi. First reported by the writer. 



^ 1 diopter us nephrelepidis Davis: Annals Ent. Soc. Amer., Vol. 2 

 (1909), p. 199, figs. Occasionally found in Chicago greenhouses attack- 

 ing the tender unfolding fronds of the Boston and other ferns. It some- 

 times becomes abundant and destructive in poorly kept greenhouses, 

 but where fumigation is regularly practiced they are easily held in 

 check. First reported by the writer. 



(To be continued) 



