1915] The Aphid Tribe Pterocommini 39D 
brown to black. Nectaries shorter than in the alate form and 
individuals taken at certain times of year with apparently 
cylindrical nectaries. The normal shape, however, is slightly 
swollen as seen in the illustration. Cauda short and broadly 
angular. 
Measurements: Length of body, 3.3 mm.; width of abdo- 
men, 1. mm. Length of antennal segments, III, 0.53 mm.; 
iVeiao tim. V. Oso - mma Wils owith-spur, J0.53 mm: otal 
length, 1.92 mm. Length of nectaries, 0.34 mm. 
The oviparous females resemble the Apterous viviparous 
forms so closely, except that they are larger that a separate 
description is not necessary. The males resemble the alate 
viviparous forms closely, but are much smaller. These two 
forms are quite common on the twigs and leaves of poplar 
along the streams of the Pacific Coast during October and 
November. 
The eggs which are deposited about the base of the buds 
are green at first, later turning to a shining black. They are 
elongate oval in shape and measure about 1 mm. in length. 
Aphis salicis Harris. 
Aphis salicis Harris (Walsh). 
Melanoxanthus salicis (Harris) Oestlund. 
Melanoxanthus salicts (Harris) Weed. 
Cladobius salicis (Harris) Davidson. 
Cladobius salicis (Harris) Essig. 
Lachnus salicicola Uhler, Thomas, Packard, Osborne. 
The writer believes that on account of the short description 
given by Harris that this species is not valid and that the 
notes and records in most cases refer to Pterocomma smithie 
Monell. 
In the third edition of Harris’ ‘‘Insects of Mass.”’ Uhler 
proposes to use Lachnus salicicola for Aphis salictt and from 
that date a number of writers have used that name. 
Pterocomma smithiz Monnell. 
Synonomy: 
? Aphis salictt Harris. 
Chaithoporus smithie Monell. 
Chaitophorus smithie (Monell) Thomas. 
Melanoxanthus smithie (Monell) Weed. 
Melanoxantherium smitiie (Monell) Gillette. 
Melanoxantherium smithie (Monell) Davis. 
This is undoubtedly the same species as Aphis salicts 
Harris, but his description 1s too meager to determine the species 
