26 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [Yol.X. 



Aphis LOXiCEK/E, n. sp. — JVhiged individuals: Green, often Avitli two darker green 

 longitudinal strii)es. Head and thorax brownish. Antennaj about as long as the bodj- ; 

 frontal tubercles short, but distinct; apical joint filiform, as long as the two preced- 

 ing taken together. Eostrum reaching below the second paix of coxaj. AVings hya- 

 line ; stigma rather long. Nectaries scarcely projecting above the surface of the abdo- 

 men. Lateral edges of the abdomen with four or five very short, green, mamudform 

 tubercles. Style not perceptible. Length 2.54°^™ ; to tip of wings 4.57""". 



On young twigs and leaves of Lonicera. Living in colonies, co\'ered 

 witli an abundant pulverulent secretion ; May — July, St. Louis, Mo. 



Aphis prunifolii. Fitch, N. Y. State Agric. Trans. 1854, p. 826. 



It is doubtful whether iwunifolm Fitch is itlentical wdth immi Koch; 

 but even should they prove to beindentical, it has not yet been satisfac- 

 torily shown that Koch's name has precedence. Were the dates 'on the 

 title-pages of these two books correct. Fitch would have three years' 

 priority; but from what Cams and Engelmann say about Koch's work, 

 it is probable that the second number was published in the latter half 

 of 1854. The exact date of Fitch's article I have been unable to as- 

 certain. At Saint Louis, this species occurs only on varieties of native 

 Plums. 



Aphis CA^fDiCANS, Fitch. 



Professor Thomas's citation of Fitch's name as the describer of this 

 species is doubtless a clerical error, as no such species as A. candicans 

 has ever been described, and the only other mention of the name that 

 we have been able to find is that given in a compiled article in 111. St. 

 Hort. Soc. Trans, x, p. 1G9 (1877), where it is printed without giving 

 either descrix)tion or authority. Professor Thomas informs me that he 

 feels sure that he has seen some description of this species by Fitch, 

 but is unable to say where. 



Aphis iielianthi, n. sp. — Apterous individuals : Varying from pale green to dark 

 green, with various irregular and A-ariable darker shadings on the abdomen, the most 

 constant and conspicuous of which is a dark green transverse band on the segment 

 above the nectaries. Nectaries dusky ; style, at least the apical two-thirds, ijalo 

 dusky. Wintjed individuals : Head and thorax jet-black; abomen green, with a trans- 

 verse band on the segment above the nectaries, and oc<?asionally Avith some darker 

 spots on the margin. Antennco two-thirds as long as the body, entirely black ; third 

 joint as long as the two preceding taken together ; fourth and fifth joints subequal. 

 Nectaries subcylindric, pale dusky, hardly reaching the base of the style, and less 

 thantwice the length of the taxsi. "Wings hyaline ; A^enation normal. Length 1.77"""; 

 to tip of wings 3.04—3.29""". 



On stems and leaves of Helianthus, Saint Louis, Mo. 



Rhopalosiphum, Koch. 



Similar to Jjj/n's, but with the nectaries claA'atc. 



EiiOPALOSiPiiUM SALicis, u. si]).—Win(/cd individuals : Head and thorax dusky; abdo- 

 men green, Avith various irregular, darker green markings. Antenme about half as 

 long as the body, not mounted on frontal tubercles ; the third and fourth joints some- 

 Avhat dentate ; apical joint half as long again as the preceding; third and fourth joints 



