356 Annals Entomological Society of America [Vol. VIII, 
with any degree of certainty and notes and records made under 
this name and under that of Lachnus solicicola Uhler could not 
have been based upon definite knowledge of the species in 
question. On the other hand, smithie is a definitely determined 
and well known species, the validity of which is unquestionable. 
It is commonly found on willow and poplar in Canada, Mexico 
and the United States. It has also been recorded from Maple 
by Weed, and I have specimens in my collection from privet 
hedge, Santa Crux, Mexico, by F. C. Bishop. 
A pterous viviparous female: General color black and brown- 
ish-yellow, but all specimens have a bluish-black appearance 
because of the whitish powder found covering the body. 
Antenne dusky at base, third and lower half of fourth segments 
yellow; remaining proportions dusky to black. Legs with 
coxee femora and basal two-thirds of tibia brown, outer portion 
of tibiz and tarsi black. Nectaries yellow. Antennz shorter 
than in other species of the group and more nearly like those of 
the Lachnine. Apparently without sensoria on the third 
segment. Abdomen with a row of broad short tubercles 
along each side. Nectaries short, swollen in the middle and 
contracted at both ends. Opening widely flanged. Cauda 
short and broadly rounded. 
Measurements: Length of body, 2.8 mm.; width, 1-5 mm.; 
length of antennal segments, III, 0.5 mm.; IV, 0.28 mm; 
V, 0.26 mm.; VI, 0.14 mm.; spur, 0.18 mm. Total length, 1.5 mm. 
Length of nectaries, 0.26 mm. 
Alate viviparous female: General color black and brownish- 
yellow, but appearing bluish on account of the white waxy 
covering found over the entire body. Antennze with two 
basal segments dusky-black. Third segment yellowish at 
base and dusky toward tip, remaining segments dusky to black. 
Legs with coxe, femora and basal half of tibiae yellow; remaining 
portion or tibia and tarsi black. Wing venation normal, 
veins slightly darkened. Nectaries yellow, tinged with brown. 
Cauda black. Antenne extending slightly beyond the third 
pair of legs, and third segment bearing from 19 to 26 circular 
sensoria irregularly placed along the inner side. Thorax 
and abdomen with a row of thick short tubercles along each 
side. Nectaries short, swollen in the middle and strongly 
