SANBORN : KANSAS APHIDID.i:. 15 



apterous females. In the adult or winged form they are more 

 normal. Beak absent in- the perfect sexes, and moderately 

 long. Wings rather large in proportion to the body ; mem- 

 brane delicate ; upper wing with a well-marked subcostal from 

 which spring three faint oblique simple veins. Caudal wing 

 with a veinless cubitus. Both wings overlap and are held 

 horizontally in repose. Legs very short ; tarsi single-jointed 

 according to previous description, but this is evidently an er- 

 ror, since I have found them to have two joints at all stages. 

 The tarsi are furnished with two claws, two capitate bristles 

 near the distal end, and a pulvillus. Abdomen globular in the 

 apterous, and ovate in the winged forms. Honey-tubes absent. 



Genus Chermaphis Linn. 



Antenna' very short, reaching but little beyond the neck 

 when turned back, composed of five joints, the two basal joints 

 short, the remaining ones generally subequal in length, the 

 fifth oval. Front wings rather large, transparent, the two dis- 

 coid als and stigmatic veins appearing as three oblique branch 

 veins ; stigma usually elongated and much pointed at the tip. 

 Hind wings with one more or less distinct branch vein. 



Legs in the winged individuals rather short, the posterior 

 pair usually not longer than the middle pair, all rather short ; 

 in the apterous individual very short. Body of the winged in- 

 dividual regularly oval ; of the apterous, nearly circular and 

 convex. No honey-tubes. Usually more or less covered with 

 a cottony secretion. 



The species so far as observed appear to be more particularly 

 confined to coniferous trees. 



Phylloxera caryaecaulis Fitch. Plate IV, fig. 27. 



Head dark. Antenntr dark, imbricated, and composed of three 

 joints; length of segments: I, 0.03 mm. ; II, 0.01 mm.; Ill, 

 0.16 mm. ; total length, 0.21 mm., extending to the wing in- 

 sertions. There is one circular sensorium on the third joint 

 about one-third of the length of the joint from the base. On the 

 distal third is what appears to be an elongate sensorium which 

 is not distinct. Eyes red ; ocular tubercles present ; ocelli 

 prominent and red. Beak dark, 0,18 mm. long, extending to 

 the mesocoxa). 



Prothorax pale yellow. Thorax a shade darker yellow ; 



