300 [December 



distinguishable by its conspicuously dark stigma. I have received in bad 

 condition from St. Louis specimens of what is probably the same insect at- 

 tached to- young vine leaves , and I have also noticed Aphides on tame vines 

 in Central Illinois. Dr. Fitch states that in the Patent Office Report for 

 1854 (p. 79) "a plant-louse is reported as very destructive to the leaves 

 and young shoots of the grape at the South, but as no description is given 

 of it, we are unable to judge whether it possesses any resemblance to the 

 foreign species." (N. Y. Rep. II, §116.) 



Aphis carduella n. sp. — Tif)S of young thistle-shoots. Blackish. Antennae with 

 joint 6 short, somewhat obtrigonate, joint 7 as long as 5 and 6 put together. Honey- 

 tubes as long as the tarsi. Legs rather short, pale greenish; knees, tips of tibise, 

 and tarsi dusky. "Wings hyaline, with the tips of the front wings slightly fumose; 

 veins brown, yellowish on the costa; the 3rd discoidal hj^aline at its origin; stigma 

 pale dusky-brown. Length to tip of wings .09 — .10 inch. 



Two specimens on Cirsium altissimum, ten on an undetermined species 



of Cirsium in company with larvJB. The antennae attain the origin of the 



2nd discoidal vein when the wings are expanded, and the stigma is rather 



more than twice as Ion"; as wide and hunched on the exterior margin. 



o 



Aphis maidis? Fitch. (Wingless 9 fig. 3, winged 9 fig- 1-) 

 Roots of maize; fig. 4 showing a portion of an infested root. Describ- 

 ed from recent specimens. The larva differs from Dr. Fitch's description 

 in being always of a pale-greenish or watery-whitish color, never changing 

 to " a pale obscure red color." The jmpse, from which I succeeded in 

 breeding fifteen winged 9 9 , were pale green, except the tips of the ros- 

 trum, of the antenna), and of the tibiae, and the eyes, tarsi and honey- 

 tubes, which are all dusky, and the anal style, the knees, and the wings, 

 which are clouded with dusky; whereas Dr. Fitch's pupae had the head 

 dusky, and the wings dusky only at their tips. The honey-tubes were 

 about the same length as the tarsi, and the anal style one-half that. Be- 

 hind the thoracic segments, both laterally and dorsally, there was a con- 

 siderable constriction. The icinjlrss females were pale green, and had 

 the head, the first thoracic segment except its anterior edge, and the sec- 

 ond except its anterior edge and a diverging line on each side, dusky. 

 At the dorsal tip of the third thoracic segment and of the abdominal seg- 

 ments 1, 2, and 6 — 9 was a transverse dusky line. Laterally on abdomi- 

 nal joints 2 — 4 was a medial dusky dot, and on joint 6 before the honey- 

 tube a terminal dusky line. Dr. Fitch's wingless females were " dull 

 blackish, faintly tinged with green;" the markings differed considerably, 

 and were '-smooth and black," not as in my specimens opa(iue-dusky. 



