722 Pomona College Journal of Entomology 



with many long and short curving spines. Style usually hid beneath the pro- 

 jecting ]>ygidiuni 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 spines 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. 

 Secondary 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. H). It seems to resemble C. nigrae Oestl. slightly but is 

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

 of Cli. 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: "Antennae 

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

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

 knob. \\'ing venation regular. Nectaries six times the length of the cauda and 

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

 family Callipterinae, Can. Ent. Dec. 1910. 



Tiie genus which it seems to most resemble is Arctaphis Walker, the type 

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

 above, tlie 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. 



In a general way the genus under consideration lies between the old genus 

 Chaitophorus and the genus Callipterus, having the general body cliaracteristics 

 of the former and the style and anal ))late of the latter. 



Eichochaitophorus populifolii n. sp. 

 WINGED VIVIPAROUS FEMALE (Figure 231 A) 



Length of body l.() mm., width of mcsothorax 0.!i mm., width of tlie abdomen 

 0.6 mm., wing ex))ansion 5 mm. A very small and active species. Prevailing 

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

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

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

 (Figure 232, !-()). Not quite as long as the body, not on frontal tubercles, hairy. 



