No. 1.] RILEY AND MONELL ON APHIDIDiE, 7 



leaving" among tlieir slirivelled bodies tlie sliining, reddish-brown winter 

 egg, citlier i)artiall.y or entirely covered by the parent's skin. 



On the IGth of Jnne, 1877, I met with an isolated tree at Malvern, 

 Iowa, belonging to Mr. H. K. Follett, which had been very badly iiifested 

 with this species. The winged individuals crowded the trunk, and had 

 I)erished in such quantities around the base of the tree as to lie in a 

 matted mass three or four inches thick, being greedily devoured by their 

 numerous enemies. One could not break off the smallest i)iece of the 

 bark without findmg the ex]30sed interstices crowded with the salmon- 

 colored sexual individuals. 



Among the morei)rominent of the natural enemies of this species, I have 

 noticed, of Coleoi)tera, Goccinella d-notata, Goccinella sanguinea {munda) 

 Say, Hippodamia convergens, and several species of Scymmis. I also 

 found feeding upon them the perfect beetle of Podahrus modestus, and 

 the Hemipterous Cyllocoris scutellatus^ Uhler, and Capsus linearis, Beauv. 

 A Lepidopterous inquiliue, namely, the larva of Semasia prunivora, 

 Walsh, is also quite common within the curled leaves, feeding both on 

 the lice and' on the substance of the leaf. A large green Syrphus larva 

 and several Glirysopa larvse also prey upon them. 



DESCRIPTIVE. 



ScHizoNEURA AMEKICAJSTA (Fig. 1). — Impregnated ego 0.5?^™ long? gamboge-yellow, 

 incliiiiug to brown iu color, with no especial external sculpture. 



First generation. — Stem-motlier : Pale yellowisli-red, with, black members when first 

 hatched; the red deei^eniug and becoming purplish or livid with age. When mature, 

 averaging 3.5'"™ in length, globose or j^yriform, with subobsolete honey-tubes and six 

 dorsal rows of darker piliferous and tuberculous spots. Antennie 5-jointed, joint 3 

 more than equalling 4 and 5 together in length. 



Second generation. — Diiferiug in no essential res]5ect from the preceding, except that 

 the individuals do not attain so great a size. Bright brownish-red when born, they 

 soon become livid brown. 



Third generation. — Mature, winged female : Alar expanse 5 to 5.6™°*. Body dusky, the 

 abdomen slightly reddish ; legs either dusky or yellowish-red. Antenute as long as hea d 

 and thorax together, dusky, rarely yellowish,. not pilose, but with a few short setous 

 points; G-jointed, the 1st and 2d joints slightly bulbous; 3d either surpassing or 

 equaling in length the 4th, 5th, and Cth together, Avhich are subeqnal; the teiuiinal 

 joint usually the shortest, the apical sub-joint being normal, and in some cases 

 sufficiently constricted to resemble an additional joint; joints 3, 4, and 5 rather 

 distinctly annul ated, the constrictions being generally quite deep, and producing a 

 moniliform aspect, there being on an average 22 such on joint 3. Tarsi with the basal 

 joint distinctly separated into a lobe, the claws strong, and iu length twice the diam- 

 eter of the tarsus. Wings hyaline : front pair with the veins becoming obsolete at 

 tips; stigma subhyaline, either of a yellowish tinge or somewhat dusky; stigmal 

 vein starting from the middle of the stigma and normally curved; cubital vein obso- 

 lete for nearly one-thml its length, the furcal forming with it almost a point; the 

 terminal distance between first and second discoidals equal to about five times that 

 between their bases (often rather more); terminal distance between furcal and cubi- 

 tal and second discoidal veins sul^equal, that betAveen stigmal and furcal slightly 

 shorter, that between second and first discoidal one-third greater, and about e(]ual 

 that between stigmal and tip of stigma. Hind Avings with the subcostal vein ahnost 

 straight, there being no curve where it gives off the discoidal veins, Avhich arc obsolete 



