Pomona Coi.i.KiiK .Iimiin.m. ok KxTOMoi.ofiv 60.^ 



mm.; I\'. O..SI iniii. ; \'. '•..'fl nun.; \'I. ().!■.') iinn. (spur O..S(i nun.) ; total l.(il mm.; 

 circular .scnsoriuni fit ii\h-\ of (irtii-l<-.\' and u.sunl oiws in tlif nail-like prm-css. 

 Prolkoras — With latt-ral tulwri'lcs at the Imsc. Meso- and Mrla-lhorax — Not dis- 

 tinctly defined, .thtionifii — Robust, smooth with lat<Tal <lepressi(uis near front 

 marf^ins. two marginal tuhrreles on each side, hiaek or dark hrown. CornirlrM - 

 (Figure l<)() E). t'yliiidrieal, widest at hase and gradually tapering to tip which 

 is slightly rimmed, imhricated, black, length O.'J nnn. I.f^' — .Normal, hairv, col- 

 ored as in the winged form. Sti/lr — Conical, much wider at base than at apix, 

 hairy, black, half as long as cornicles, 0.1 mm. 



Young — The young apterous forms are from dull brown to bl.iek. while tb<- 

 nymph.s are reddish brown. 



Hosts — This species settles in great colonies on the tender twigs of orarge 

 and lemon trees and may entirely destroy the new top on a young tree. They 

 also feed upon the undersides of the leaves of suckers and tender shoots of old trees. 

 In not a few cases old, tough leaves are attacked by this species. The presence of 

 the insect upon the older leaves is usually recognized by the curling and tw-sting 

 of the foliage so as to form a place of protection for them on the insides • ,{ the 

 cup-shaped leaves. While this insect has In-en found feeding on Orange, Citron 

 and Camellia in Europe and on I'elea, Straussia and Coffea in the Hawaiian 

 Islands, I have been able to find it only upon citrus trees in this locality, where 

 it seems to exist during the entire year. 



Locality — Throughout the entire southern part of California. T;ikcn by the 

 writer in San Diego, Orange, San Bernardiru>, Los Angeles and Ventura counties. 

 Wm. Davidson also reports it at San .Jose. 



Date of Collection — Occurs in this locality during the spring and early sum- 

 mer months in abundance. Collected .\i)ril .S, 1911, when most numerous. Serial 

 number 1 !•. 



This species is easily mistaken for another small black aphis working in a 

 similar manner and nearly always associated with it on seedling t'x-cs, Aphit 

 gosst/pii Glover. It is easily distinguished from A. gossypii, with the unaided eye, 

 by the black stigma on the primary wings as referred to above, and most easily 

 distinguished under the micro-scopc by the third discoidal vein being but once 

 branched instead of twice as in A. gosiypii. 



Satural enemies — This insect is most elTectually held in check by the two 

 inturnal parasites described hereinafter and by the larvic of the large .Syrphid Fly, 

 Lnsiophthicus pyrastri I... although the larva- of the Syrphut americanui Wicd., 

 and of Alloarapta oUliqun Say. play an important part in this. Of the ladybird 

 beetles, Coccinella californica Mann, is the most important enemy here. 



Mr. John .lune Davis, .Mr. .). T. .Monell, Prof. Theo. I'ergande and I'nif. \\ ni. 

 Davidson h.ive aided nie uuuli in the di-lerniin.ilion of this species. 



