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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 7 



of the leaves of Q. agrijolia and Q. lohata Nee, tightly curling over 

 the edges of the leaf and thus forming a pseudo-gall. The second gen- 

 eration are wingless and remain in the gall until mature, when they 

 leave the gall for the under side of adjoining leaves, living thenceforth 

 unprotected except for the wooly covering characteristic of the species. 

 I have observed this aphid in Placer, Contra Costa and Santa Clara 

 Counties in California. In Placer Co. it infests the Interior Live Oak 

 {Q. wislizenii A. DC). 

 Chaitophorus sp. 



Stem mother: Pale yellowish-green with two longitudinal light gi-een stripes on the 

 dorsum of thorax and abdomen. Antennae six -jointed (filament regarded as a joint), 

 one-quarter as long as the body, pale, first two joints slightly dusky. Eyes small and 

 undeveloped. Legs pale, tarsi dusky. Cornicles appearing as dusky-rimmed pores 



on the surface of the body. 

 Cauda globular, pale. WTiole 

 body except the head clothed 

 with short, stout, erect 

 white spines. M easur ements : 

 Body, length to tip of Cauda, 

 2.00mm.; body, width (maxi- 

 mum), 1.16mm.; cauda, 

 length, .054mm.; antennae, 

 joint III, .207mm.; joint IV, 

 .100mm.; joint V, .100mm.; 

 filament, .024mm. 



Dimorph: Entirely pale 

 yellowish-white, flabellae hya- 

 line. Body short, oval, very 

 flat. Eyes black, not well 

 developed. Antennae three- 

 jointed, distal joint three or 

 four times as long as the two 

 basal combined; articulations 

 rather obscure. Legs stout, 

 bearing hairs. Beak pale, 

 barely reaching second coxae. 

 Flabellae, long, two-jointed, 

 sharply pointed at apex, 

 narrow, the basal joint 

 the broader; longest pair, .08mm.; basal joint about one-third as long as distal 

 joint; latter easily broken off leaving basal joint with sharply pointed apex. Each 

 antennal joint bears a flabella shorter than those of the body. Flabellae spaced 

 almost regularly around the margin of the body, 38 in number. Cornicles short, 

 pale, erect from the body. Cauda short and blunt. 



Provisionally placed in Chaitophorus. 



The stem mothers were observed April 13, 1913 on the leaves and 

 stalks of Quercus lohata Nee. On that date they were surrounded 

 by young of the second generation. Ten days later before any of 

 these young had matured an invasion of Lampyrid beetles apparently 



Fig. 1, Chaitophorus 1, stem mother, head; 2, 

 stem mother, cauda; 3, dimorph. 



