Mar., 1903.] Food Plants of Some Bythoscopidae. 
399 
P. viridis Fitch. — This species appears to be strictly confined to 
the narrow-leaved willow (S. longifolia) . The adults appear the 
middle of June. 
GENUS IDIOCERUS. 
The American forms of this group have been recorded from 
only three genera of plants and these all tree forms. The follow- 
ing notes add as many more genera to the list and introduces for 
the first time strictly bush forms as host plants. Wherever wil- 
low forms have been studied they have been found confined to one 
species or to a group of closely related species of willows and not 
general feeders as has been commonly supposed. 
I. do/osus Ball. — Found only on the bushy Sumac (Rhus aro- 
ma tica) in the mountain region of Colorado. Adults have been 
taken from the middle of July until late in August. 
I. famentosus Uhl. — Common on Salix longifolia, seeming to 
prefer the short, thick clumps and sheltered locations. Found in 
Iowa, Nebraska and Colorado. 
/. snowi G. and B. — found on S. longifolia. 
/. lachrymalis Fitch. — found only on the Quaking Asp (Popu- 
lus tremuloides) . 
/. femora Ins Ball. — is a willow form, but has not been found in 
sufficient numbers to determine which species of willow it lives on. 
/. produdus G. and B. — is also a willow form. 
/. morosus Ball. — This was swept commonly from two species 
of Rides growing in the foot hills and mountains west of Fort 
Collins, Colo. It was most frequently met with on the red cur- 
rant or squaw berry (R. ccreum . ) 
/. verrucosus Ball. — was also taken on currants at about the 
highest altitude at which they grow. 
/. ensiger Ball. — This is probably another currant form, though 
not enough specimens were taken at any one time to eliminate the 
possibility^ of it being an accidental capture. There were two 
very distinct kinds of larvae found together on the squaw berry — 
one, dark reddish brown that apparently belonged to this species, 
and a green form that was probably morosus. 
/. amoemus Van D. — This pretty species lives on the Juniper, 
where its rufous and green match well with its surroundings. 
/. nervatus Van D. — This species has been reported as occur- 
ring on willows, but in Colorado it seems to be an inhabitant of 
the Juniper. It is possible that there are still two species mixed 
under that name. 
The American Association. 
We have been interested in noticing the membership of the 
American Association for the Advancement of Science from the 
different Universities of the country, as shown by a Geographical 
list recently published by the Association. 
