yo. 1.] EILEY AND MO?^ELL ON APHIDIDiS. 1 9 



segments. Winged females : Head, protLorax, and sometimes the npiiersegmenls of the 

 abdomen, brownish-black ; the upper part of the thorax vrith a narrow, but conspien- 

 ous, transverse, yellow band ; general color of the abdomen pale green, with irregular, 

 broken, transverse, dark brown lines, three of these often becoming confluent, and pro- 

 ducing a dark patch in the centre of the abdomen, just above the honey-tubes. Nec- 

 taries long, cylindrical, slightly dusky at their apices. Style long, slender, slightly 

 curved iipwards, more or less dusky. Length of the autennte a little variable, as long 

 as the body, or slightly longer. Frontal tubercles approximate at base, and somewhat 

 liorrect. Wings hyaline; stigma rather narrow and linear; stigmal vein very shor^, 

 and curved much as in the genus CalUpterus. The forklets of the cubitus are espe- 

 cially variable, their length being in one case four times and in another one-half that 

 portion of the cubitus between the base of the lower branch and the base of the fork- 

 lets. In the normal specimens, these distances are subequal. Leugth 2.28""" ; to tip of 

 wings 3.81™"'. 



On the under side of leaves of Achyrantes {Amaranfacecc). TMs is the 

 first species tliat has been noticed as infesting plants belonging to this 

 order. A species closely allied to this occurs on Polygonum and another 

 on Lettuce, but my notes on their colors are not sufficient to enable me 

 to describe them satisfactorily. 



SiPHOXOPHORA CALENDULELLA, n. sp. — Viviparous (ipicrous fanciles : General color 

 very pale whitish-green, varying to yellowish. Antennie AA^hitish, as long as the body, 

 mounted on i)orrect tubercles. Legs yellowish, except the tarsi. The nectaries and 

 short style concolorous. Length 1.27 — 1.77""". 



On the under side of leaves of Calendula micrantha. July, Saint Louis, 

 ]Mo. Described from four viviparous females and two pux38e. 



This species can be easily distinguished from the allied '^S^. achyrantes 

 by its very much i^aler colors, and hj having the frontal tubercles more 

 ])orrect in the aj)terous form. 



What use the porrect tubercles can be to an Aphid I am unable to 

 surmise, but I have observed on three occasions single individuals be- 

 longing respectively to 8. achyrantes, 8. calendulcUa, and Fhorodon ma- 

 haleb, which held a small fragment of some black extraneous substance 

 tightly clasped between the tubercles. Whether this was accidental or 

 not, I will not presume to say. 



SiPnoNOPnouA graxaria (Kirby). 

 Aphis granaria, Kirb5^, Linn. Trans. iA^, 238. 



hordei, Kyber. 



cereaUs, Kalt. 



avence, Fitch, et auct. amer. 

 Siphonophora cerealis, Koch, Kalt., Pass, et auct. plur. 



avence, Thos. 



granaria, W'lk., Buckt. 



It is impossible to determine whether this is the Aphis avenw of Fabr. 

 and Gmclin, as these authors give no descrix)tion of the species. 8. cereaUs 

 seems to be the name which has been generally adopted in Europe, while 

 8. avence is the one universally adopted in America. 



SiPiioxopnoRA TULiPiE, n. sx>. — Apterous females : Pale green, with a dusky-green 

 stripe dovv'n the middle and darker green on the margins of the abdomen. Winged in- 



