722 Pomona College Journal of Entomology 



witli many long and sliort curving spines. Style usually hid beneath the pro- 

 jecting pygidium or last abdominal segment which is well rounded and hairy. 



Anal Plate — Distinctly bifurcated, but not as deeply forked as in the genus 

 Callipterus, situated well under the body, with long and short curved s])ines which 

 are set on slight tubercles. 



Wings — Rather slender, normally typical Aphis venation, but very variable 

 as shown in accompanying cuts (Figure 231, 1-19). Stigma rather short and 

 oval in shape, about three times as long as broad, light streak near lower margin, 

 below which is an irregular row of short hairs. Stigmal vein and first and second 

 discoidals as in Chaitophorus, third discoidal variable, from once to thrice forked, 

 though it is normally twice forked, locations of forks exceedingly difficult to fix 

 and seldom constantly located, usually obsolete at the base. Veins without clouded 

 borders. Membrane hyaline or slightly darkened. Finely punctured or scaled. 

 Secondar}' wings with normally two discoidals, but often with but one. 



It has been with a great deal of reluctance that I have created this new 

 genus, and not without a vast amount of examination of both literature and speci- 

 mens. I have also sent specimens to Prof. Davidson, who wrote: "I do not know 

 of any aphid like No. l6. It seems to resemble C. nigrae Oestl. slightly but is 

 not same species of course. Williams in his 'Aphididae of Nebraska' p. 27, says 

 of Ch. nigrae, 'tail knobbed'." The species cannot belong to the genus Chaito- 

 phorus as it now stands for in looking at the characters which determine the genus 

 we find the following, which does not agree with the above description: "Antenna" 

 on indistinct frontal tubercles; spur of the sixth segment longer than tiie third, 

 and about six times as long as the sixth segment. Cauda very sliort, being but a 

 knob, ^^'ing venation regular. Nectaries six times the lengtli of the cauda and 

 constricted in the middle." Wilson, A Second Paper on the Genera in tiie Sub- 

 family Callipterinae, Can. Ent. Dec. 1910. 



The genus which it seems to most nscniblc is Arctaphi.s Walker, the type 

 of which is Aphis populi Linn. According to Wilson, in the article referred to 

 above, the cauda is a knob on a quadrangular base. The anal plate is broadly 

 rounded. In the new genus the style has a distinct neck and is situated on a 

 very distinct conical base. The anal plate is deeply notched in the middle so as 

 to make it somewhat forked as in the genus Callipterus. 



Ill a general way the genus under consideration lies between tiie old genus 

 Chditopliorus aiui the genus Callipterus, having the general body eliaraeteristics 

 of the fornur .uid the style and anal plate of the latter. 



Eichochaitophorus populifolii n. sp. 

 wiN(;ki) viviPAHors female (Figure 'i.'i 1 A) 



I.riigtii of body 1 .() luiii., width of luesotliorax ()..) mill., widtii of the abdomen 

 O.fi nmi., wing expansion ."> iiiiii. .\ very small .and active species. Prevailing 

 color — Dull green head and thorax and light green abdomen. Bodij — Very thin 

 and flat. Head — Well rounded anteriorly, bristled, dull or dusky green, some- 

 times nearly black. Eyes — Dark red, small with distinct tuinrele. Antennae — 

 (Figure 232, !-()). Not ([uite as long as the body, not on frontal tulxreli's. hairy. 



