1895.] Contributions to Coecidology. 729 
_ * Dactylopius solani var. nov. atriplicis. On Atriplex canescens 
close to the Agricultural College, Sept., 1894, living on the 
twigs and branches. 
ọ. Size of D. citri; pale greenish, sparsely mealy, no lateral 
processes; forming no ovisac, but a cushion of white cottony 
matter, in which are seen lively young. 
_ Mr. Joseph Bennett, who was a student of the college at the 
time of the discovery of this insect, prepared specimens of the 
ọ,and drew up the following description : 
“Derm clear transparent. Form oval, slightly obovate. 
Leg: coxa rather short, about as broad as long; trochanter 
rather large, about half as long as coxa and two-thirds as 
broad as long; femur about one and a half times as long as 
coxa, and about two-thirds as broad as coxa; tibia about as 
long as femur, and half as thick; tarsus two-fifths as long as 
tibia and very near as thick, tapering to half as thick, claw 
very small. Anal ring with six hairs. Antenna 8-jointed; 1 
short and thick, 2 about as long as 1, 3 much longer than 2; 
4, 5, 6 about equal in length, about one-third as long as 3 and 
same thickness; 7 a little longer than 6; 8 as long as 3+4. 
Formula 83 (21) 7 (654). Each joint emits numerous hairs, 
those on final joint being longest.” (J. Bennett.) 
3. Mr. Bennett had the good fortune to find the ¢, of 
which I noted the following characters: 
_ Very small, about 1 mm. long, dark sage-green or greenish- 
gray, legs and antennæ brownish; caudal filaments only 
about as long as abdomen, thick, snow-white from secretion ; 
wings semitransparent milky-white. . 
The typical D. solani lives on the roots of solanum under- 
ground; and differs from the var. atriplicis in lacking the 
greenish color, and in the second joint of the antennæ being 
somewhat.longer than the third. (The typical D. solani, hith- 
erto known only from New Mexico, is to be added to the 
‘fauna of Colorado, having been found on roots of Solanum ros- 
tratum (n. p.) at Fort Collins, coll. C. F. Baker, com. Gillette. 
Found originally on potatoes grown in the Mesilla Valley, it 
was not feared as a potato pest, since the potato is not grown 
as a regular crop. It may, however, prove quite otherwise at 
