720 Pomona College Journal of Entomology 



0.3 mill.) : tlif rtlativf lengths compare well with those of tlie winged form. Usual 

 sensoria on V' and VI. Rostrum — Not reaching to the second coxae, transiiarently 

 white. Thora.f — Prothorax and mesothorax con.siderably narrower than the 

 inetatliorax and the abdomen, light green. Abdomen — Well rounded, wide, flat, 

 margin.s .show segmentation plainly, but it is not carried across the dorsum, very 

 light green. Anal plate, well rounded, light, hairy. Cornicles — (Figure 230 K). 

 Same general shape as those of the winged female, but larger, light yellow to 

 coneolorous with body, length 0.08 mm., width of the base 0.0*) mm., width of 

 the mouth ().():") mm. Usually slightly longer than broad. Legs — Slender and 

 frail, hairy, transparently white throughout. Sttjle — Short, nearly conical, con- 

 eolorous with body, length 0.0,') mm., width of base 0.065 mm., with few hairs. 



Young — Transparently light green or yellow to colorless. Body bearing 

 many large tubercles, each supporting a large curved hair or spine. 



Host — Found feeding only upon the leaves of the tender shoots and suckers of 

 Salix lasiolepis Benth. During the year 1910 they were exceedingly abundant and 

 attacked all of the leaves, young and old, but never the bark. Very much honey 

 dew was excreted, smutting the trees until they appeared black. This summer 

 I was able to collect but very few. although a sharp lookout was maintained 

 throughout the year. The wunged forms were exceedingly rare. This scarcity 

 is jirobahly due to the ravages of the internal and predaceous enemies, which 

 were exceedingly numerous both last year and this summer, the larvae of a syrjihid 

 fly being predominant. On Septmber 14, IQll, I took this species in small num- 

 bers from Sali.r Laevigata Bebb. 



Locality — Found only on willows growing near the ocean beach on a fresh- 

 water marsh just inside the sea-wall, three miles from Oxnard, Cal., on wli.it is 

 known as the McGrath F.state. Though a careful search has been made of all 

 species of willow trees in every other part of the county, I have never been able 

 to locate this species in any other place except late in tlie fall along the Santa 

 Clara River near Santa Paula. Cal. 



Date of Collection — .July 1. I.OIO. and September I 1-. 1911. Serial iiuiiil)er 10. 



Because of its long antennal filament and other characters wliieli exelude this 

 species from Arctaphis (the constricted style) I have ])laced it in the genus 

 Micrrlla. Having never collected wli.it I believe to be the true Chaitophorus 

 Moncll, and without comparative material except published descri])tions, I sent 

 this species on to Mr. Monell, asking him if it was identical with C. viminalis 

 Mon. His reply was as follows: "No. 10 on Salix is a new species of Chaito- 

 phorus" (St. Louis, Mo., Oct. ,'i, 1<)10). Because of his valuable aid in this work 

 I am n.aming this species for him. A comparison of Micrella monelli n. sp. with 

 the descriptions of Chaitophorus viminalis Monell and its synonym Chiiitophdrus 

 nigrae Oestlund brings out some most notable differences, as follows: 



