Pomona College Journal of Entomology 745 



of III (hisky ;iiiil)tr, IV slightly dusky througliout with \ cry dark tip, V and VI 

 very dark throughout. Lengths of the artic-hs: I, 0.0") iniii. ; II, O.O.J mm.; Ill, 

 O.l.'iH mm.; IV, 0.07 mm.; V, 0.07 mm.; VI, 0.17.') mm. (base ().()().") mm., spur 

 0.1] mm.); total 0.553 mm. Articles I and II usually equal in length, with the 

 former mueh wider; 111 iii;irl\- twiee as long as either l\^ or V^, l)ut not so long 

 as VI, though shorter than the spur; IV^ and V coe(iual, and both short, eaeh being 

 but slightly longer than the base of \'I; V'l longer than III, the sjjur nearly twice 

 as long as the base. Sensoria norm.al on V and in the process of \'I. liostriim — 

 Reaching nearly to the third eoxip, green with amber base and d.ark tij). Thorax 

 — (jreen with light yellow upper portion of the cross on the medium dorsum, 

 ventral surface green. Abdomen — Green, the basal portion bearing the transverse 

 bar of the yellow cross and the posterior portion bearing the lower main axis of 

 the cross, a light sjiot at each end of the transverse bar, and light areas around 

 the inner bases of the cornicles, covered with long curved spines. Ventral surface 

 of a uniform dull green. Anal plate well divelope^ and rounded, green. Cor- 

 nicles — Light yellow or very light yellowish green, wider at the base than at the 

 apex, not constricted before mouth, which is not Hared. surface covered with a fine 

 network of lims, wliieli form ;i mosaic near the apex. Length 0.06 mm., width 

 of base 0.07 mm., width of the mouth O.Ol nnn. Legs — As in the winged forms, 

 Sfi/le — (Figure ^2.'i8, 6). Rounded at tip with sides nearly ])arallel, rough, spiny, 

 little wider at the base than at the tip, green, length 0.07 nnn., width of base 

 0.07 mm. 



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

 dusky head, antennae, tips of tarsi and tibia. The heads in the older individuals 

 have a light dorsal, median line. 



Host — This sj)ecies has been observed feeding only on the undersides of 

 the leaves of the W^hite Willow (Saltjr macrostachya Nutt.). on which it collects 

 in dense colonies and produces considerable smutting. 



Localifi/ — On the white willows growing along the banks of the Santa Clara 

 River in the vicinity of Santa Paula, Cal. 



Date of Collection — August 25, 1911. Serial number 37. 



In general appearance this insect at first appears to be Eichochaitophorus 

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

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

 which is even near to the one just described. 



