Pomona Coi.lkoe Joitknai. ok Entomoloov 58*' 



frontal tubercles, imioli sliortiT than tlu' body, very spnrsrly Imircd, dnrk throu^li- 

 out except the base of article III, imbricated. The lengths of the articles are as 

 follows: I, O.I nini.; 11, 0.07 iiini. ; III. 0. V iiini. ; IV, 0.41 iiiin. ; V, 0.'.il mm.; VI. 

 0.4 mm. (spur 0.26 mm.) ; total \.:i[) mm. With .s<-nsoria on V and VI articles n.s in 

 normal forms. Rostrum — Ueachinjj just beyond second coxa-, amber brown with 

 darker bjise and tip. Prolhorax- .*^li({litly wider than head, with small lateral 

 tubercles. Abdomen — Well rounded, dull green, covered with H<K-culenee, three 

 small marginal tubercles on the sides. Coruiclet (Fig. , G) — Incrassate, nearly 

 vasiform, imbricated, widest in middle and n;irrowest just before the mouth, often 

 appear cylindrical with swollen tip, bl;iek, length 0.2 mm. Stifle ( Fig , .1 and K) 

 — Conical or bluntly ensiform. rough, hairy, black. Iingtii U.I i nun., shorter than 

 the cornicles. 



Young — Much lighter in color than tin- .idults and almost destitute of the 

 white flocculcncc. 



Host — Orange trees, where it occurred in great numbers. 



Locality — Collected by Horticultural Inspector C. H. Vary at Pomona, Calif. 

 It has never been locited .•mywhere else and cannot ev«-n be found then- just now. 



Date of Collection — Ajiril •I', 190,9. Serial number ii6. 



The general appearance of this insect with its short antenna- and cottony 

 covering is not unlike that of one of the members of the genus Lachnus and was 

 so recorded by me at the time it was first obtained. Strange to say, when first 

 collected by Mr. Vary it occurred in such numbers as to nearly ruin the infested 

 trees. Prompt measures were taken to hold the pest in check and it soon disap- 

 peared. Since then I have been unable to obtain fresh material. From the very 

 beginning it did not appear to be Aphis gossypii Glover, but I thought it might 

 be one of the various forms of that species and so describ»'d it as such. Since that I 

 time have sent specimens to various of the authorities on this group and have 

 received the following replies: 



"Your letter of the l;Hh ult. at hand and I have gone over the slides you 

 sent. I am returning them under separate cover and will s;iy that those labeled 

 Aphis gossypii are not that species. ."- -H. F. Wilson, Oreg. .\grcl. Kxp. 



Sta., Mar. 2, 1911. 



"I feel certain that the insect that you have figured .is Aphis gossypii in (pilti- 

 wide from that species. This insect is a very abundant one in Colorado upon our 

 cucurbitaceous plants, especially infesting the cantaloupe. 1 have also material 

 from the cotton i)lant in Texas and am quite certain that we have the species 

 correctly determined. . . ." — C. P. Gillette, Colo, .\grcl. Exp. Sta., June 9, 1910. 



"Aphis sp. .' No. »6. — It appears to be nearest related to A. gossypii, though 

 there are too many sensoria in the third antennal joint." — Theo. Pergande. Hur. 

 Ent., U. S. Dept. Agrcl., June 12, 19H. 



Not being able to place this as an already described species, I have felt 

 justified in calling it a new species, and have named it in honor of Prof. A. J. 

 Cook of Pomona College, whose work for th<- upbuilding of the citrus industry in 

 this State is well known throughout the entire country. 



