o9 
year; and the same is true of the green apple aphis (Aphis pomi 
De G.), which is sometimes so abundant as to kill young trees. Mr. 
H. E. Mathews, horticultural inspector for Delta. County, considers 
these lice as the most serious pests to fruit in his section, and Mr. 
Thurston White, horticultural inspector for Fremont County, says 
the black peach aphis (Aphis persicw-niger Sm.) is one of the most 
serious Insect enemies he has to deal with. 
Gooseberries and currants suffered quite severely in the northern 
portion of the State the past summer from the attacks of the goose- 
berry fruit-fly (4pochra canadensis Loew) and from a fruit-worm 
closely allied to Zophodia grossulariw Riley, but apparently different 
from that species. 
Aulacaspis rose Bouché was taken for the first time in Colorado 
last October upon blackberry canes, where it seems to have been 
fairly common. 
The cherry scale (Aspidiotus forbesi Johns.) was reported to me 
by Professor Cockerell, who took examples near Colorado Springs. I 
believe this scale has not been taken before in Colorado. 
The San Jose scale (Aspidiotus perniciosus Comst.) 1s still un- 
known in the State. The scale that gives inost promise of being 
a serious orchard pest is Aspidiotus howardi Ckll. It is partial to 
pears and plums and attacks the fruit badly, but does not produce 
the red discoloration that 1s so characteristic of perniciosus. 
SHADE-TREE PESTS. 
The cottony maple-scale (Pulvinaria innumerabilis Rathv.) is prob- 
ably our worst shade-tree pest and is about equally bad each year, 
but Mr. S. Arthur Johnson has a paper upon this insect, and I will 
not say more about it. 
The so-called oak borer (Prionoxystus robiniw Peck) is a serious 
enemy to our poplar and cottonwood trees and is especially destructive 
to Balm of Gilead. A phytoptus mite (/riophyes populi Nal.*) 
ereatly disfigures our poplars and cottonwoods by the production of 
irregular knot-hke swelling upon twigs ame smaller lmbs, par- 
ticularly about the buds. 
ENEMIES TO GARDEN VEGETABLES. 
A radish maggot that I have taken to be Anthomyia radicum, but 
which does not seem to the writer to answer very well to Doctor 
Riley’s description of this species, has been troublesome in radishes 
in Colorado for a few years past and seems to be on the increase. 
There were at least two broods of the flies at Fort Collins the past 
@ Deterinined by Mr. Nathan Banks, through the courtesy of Dr. L. O. Howard. 
