'^'"■'^■^ RILEY AND MONELL ON APHIDID^. 25 



^ Aphis cornifoli.e, Fitch.- JVlngcd individml: Head and thorax duskj-; abdomen 

 (.ark tuscons. Fore femora entirely yellow; hind femora yellow only at base ; bas«' 

 ut the tibnij yellow in all the legs; tar.si more or less dnsky. Antenna, more or less 

 dusky, as long as, or a Httle longer than, the body. Nectaries dusky, cylindric, scarcely 



ongerthaii the tarsi. Abdomen tnmcate. Style dusky, short, but distinct. Win4 

 hyaline The stigma projecting somewhat above the margin, much as in A. corcoimdt, 

 t^apcred abruptly at apex. Costa aud stigma pale yellow; oblique veins dusky 

 Apterous mdividuals pulverulent. 

 Length 1.27"i"' ; to tip of wings 2.28"'"'. 



Oil the under side of leaves of Cormis forida and Cpamcnlata, June- 

 July ; Saint Louis, Mo. 



Aphis chat^egifoli^. Fitch. 



This interesting species belongs to the genus Aphis, scnsu strictiori, aud 

 can be distniguished from its allies by its longer stigma, which is gently 

 tapered at apex, and prolonged until opposite the middle of the stigmal 

 veni. This is evidently the same species as that mentioned by Wakh 

 (Phil. Ent. Soc. 18G2, p. 301). ^ 



On Cmtcegus coccinea, Saint Louis, Mo., June. 

 Aphis atriplicis, Linn. 



The common ApMs on Chenopocliacece appears to be identical with the 

 European. Its occurrence in America has not been previously noticed. 

 Saint Louis, Mo. ; Carbondale, lU. (Miss ^. Middleton). 



Aphis hyperici, n. six— Winged mdivicluals : General color light reddish covered 

 with pulverulent matter; antennae on short tubercles, a little longer than the body 

 third joint as long as the fourth, fifth, and sixth taken together; apical joint about 

 twice as long as the preceding. Wrings hyaline ; stigmal vein much curved ; distance 

 between the base of the cubitus and that of the stigmal vein equal to the distance 

 between the apices of the lower forklet and the lower branch of the cubitus Nec- 

 taries very short, only detected with difficulty. Tail reddish, little over ha,lf as Ion- 

 as the tarsi, slender and terete. " 



Length 1.06— 1.27n"n; to tip of wings 1.77— 2.28'""\ 



Living in colonies on the young twigs and under side of leaves of 

 Hypericum Jcahnianum, to which species it seems to be confined. July 

 Saint Louis, Mo. ' 



The allied American pulverulent species may be arranged as follows : 



A. Nectaries scarcely perceptible. 



?. General color red ;,y^,,,.^. 



U General color green ^,„;,„.,,, 



AA. Nectaries distinct : 



b. Nectaries longer than the style, both more or less dusky. 



c. Abdomen of the winged individuals dusky or reddish; antenna} more than 

 half as long as the body. 

 d. Body red or dusky-reddish, with two pruiuose spots on base of abdo- 



™®^ ■ ccphalanthL 



dd. Body dusky, without pruiuose spots coniifoUa;. 



cc. Abdomen of winged individuals green or yellowish-green. 



d. Antennae half as long as the body ; nectaries as long as the tarsi ; 



stigma short (Walsh) maidis. 



dd. Antenna) two-thirds as long as the body ; nectaries scarcely half as 



long as the tarsi hmsskce. 



U. Nectaries and style green, subequal; as long as the tarsi aMjylicis. 



