'^'0. 1.] RILEY AND MONELL ON APHIDID^. 31 



enable one to recognize the species. It is, however, probable that it is 

 distnict, as the measurement he gives woukl make his species slightly 

 larger than the present one; besides, were thev identical, it would be 

 rather smgular that Dr. Fitch should omit to mention the obsolete sti'--- 

 mal vein, and at the same time be at the pains to mention tliat the ba.se 

 of the cubitus was hyaline. 



I am unacquainted with CalapJiis hetnleUa Walsh; but, unless there 

 are other distinguishing characters, the mere absence of the stigmal vein 

 will not be sufficient to separate Calaphis from Calllpterus, as there is a 

 complete series of transitions between the two. 



C.VXLIPTERUS CAnY.^,n. Six-Winged form: General color pale yellow ; tips of the aii- 

 teiiDal jomts black ; legs entirely pale whitish. Antenn^B a little shorter than the body • 

 seventh joint eqnal to or one-third longer than the preceding ; fifth joint as Ion- as eth 

 two following taken together. Nectaries not perceptible. Rostrum not reachino- to 

 the middle cosie. Wings hyaline ; veins pale ; stigma rather short and blunt at apex 

 btigmal yem subobsolete, its course being only traced with difficulty. The distance 

 between the apex of the lower cubital branch and that of the second discoidal equal 

 to about one-half the distance between the apices of the lirst and second discoidals 

 Apterous yiyiparous females and pupa? with four- longitudinal rows of tubercles, each 

 mounted with a capitate bristle. 



Leaves of Walnut, Hickory, and Pecan. June— July. Saint Louis, Mo. 



Callipterus? quercioola, n. sp.-Wingedform: Antennaj about half as long as the 

 body; not mounted on frontal tubercles; remote at base ; third, fourth, and fifth joints 

 equal m length ; transition from the sixth to the seventh joint exceedingly gradual ; 

 seventh joint about half as long as the preceding. Rostrum short, not reaching the 

 second coxa3 ; apical joint very acute. Nectaries reduced to mere openings. Style 

 none. Wings with the veins bordered with brown. Stigma rather short, and blunt 

 at apex ; the cubital vein arising from its base. Stigmal vein not so much ciu-ved as 

 usual lu this genus, not hyaline ; distance between the base of the cubitus and that 

 of the stigmal vein equal to the dist ance between the furcals and less than the dis- 

 tance between the base of the cubitus and that of the second discoidol. Second dis- 

 coidal not sinuous. Body rather elongate. Length l.Trm™ ; to tip of wings 2.79™°i. 



It is with considerable doubt that I place this species in the genus 

 Callipterus. It is very probable that it should be placed under Asiphum ; 

 but the only description of this genus which has been published is that 

 given by Koch, and, like the other generic descriptions which were made 

 from memory after the loss of his eyesight, is somewhat unsatisfactory. 

 The following is a translation of the salient points in his description: 



Asiphum, Koch.—" Beak short. Antennae rather short, the third, fourth, 

 and fifth joints subequal, the apical joint very small, scarcely perceptible." 

 Of this interesting species, I have only seen two winged specimens, 

 mounted on a shde, which was communicated by a correspondent with 

 the information that it occurred at Saint Louis on Oak. 



Chaitophorus, Kocli (emend.). 



Similar to Aphis, but with the antenna} and body distinctly pilose. 

 Style tubercle-like. 



CiiAiTOPnoRUS vnriXALis, n. SY^.—Ajiterom iiidividuah : Varying from pale green to 

 liglit yellow, with two darker vittse on the abdomen, which are often obsolete. Entire 



