Pomona Collboe Journal of Entomoloov 745 



of III dusky niiibcr, I\' sli^litly dusky throuffluiut with vi-ry dark tip, V niid \'I 

 MTV dark throughout. Lengths of th<- artich-s: I, O.OH nun.; II, ().0.'5 nun.; Ill, 



0.I.S8 mm.; IV, ().()7 i. ; V, 0.07 mm.; VI. ().I7.'> mm. (Imso O.OtJ.'i mm., spur 



0. II mm.); total O.HT)^ nun. Artich's I and II usually rqual in li-ngth, with thf 

 former much wider; III nearly twiee as long as either W or \', hut not so long 

 as \'I. though shorter than the spur; IV and \' coeiiual. and l)oth short, eneh iM-ing 

 hut slightly longer than the hase of \'I ; \'I longer than III. the spur nearly twice 

 as long as the hase. Sensoria normal on V and in the prm-ess of VI. lioifrum — 

 Reaching nearly to the third coxa-, green with and)er base and dark tip. Thorns 

 — (ireen with light yellow upper portion of the cro.ss on the medium dorsum, 

 ventral surface green. Ahdomrn — Green, tin- basal portion bearing the transverse 

 h.ir of the yellow cross and the posterior Jjortion bearing the lower main axis of 

 thi- cross, a light spot at each end of the transverse bar. and light areas around 

 the inner bases of the cornicles, covered with long curved spines. \'i-ntral surface 

 of a uniform dull green. Anal plate w»>ll developed and rounded, green. Cot- 

 nirlrs — Light yellow or viry light yellowish green, wider at the base than at the 

 apex, iu>t constricted before mouth, which is not flared, surface covered with n fine 

 network of lines, wjiich form ;i mosaic near the apex. Length 0.0() mm., width 

 of base 0.07 nun., width of the mouth 0.0 !• nun. Leg* — As in the wingi-d forms, 

 Sli/lr ( I-'igure '2.S8, ()). Rounded at tip with sides nearly parallel, rough, spiny. 

 little wider ,it the b.tse tii.in .it the tip, green, length 0.07 mm., width of base 

 0.07 uun. 



Young — The young vary from .'i light yellow to a light green, usually have 

 dusky head, antenuH*, tips of tarsi and tibia. The heads in thi> older individuals 

 have a light dorsal, median line. 



Host — This species has been observed feeding only on the undirsides of 

 the leaves of the White Willow ( .S'n/i.r mnrroflarhiin Nutt.). on which it collects 

 in dense colonies and ))roduees considerable snmtting. 



Localitif — On the white willows growing along the b;inks of the .Santa (lar.i 

 River in the vicinity of Santa Paula, Cal. 



Diite of Collection — .\ugust ^.'>, 1!)1L Serial number 37. 



In general appearance this insect at first appears to Ih' Kichochailophorus 

 populifolii, because of the light dorsal markings and the size, but as shown by 

 the descriptions, is (juite distant from that species. I know of no other species 

 which is even near to the one just described. 



