/20 Pomona College Journal of Entomology 



0.3 mm.) ; the relative lengtlis eompare well witii those of the winged form. Usual 

 sensoria on V and VI. liostiuin — Not reaching to the second coxie, transparently 

 white. Thora.i — Prothorax and niesothorax considcralily ii.irrower than the 

 metathorax and tlie abdomen, light green. Ahdtnncn — Well rounded, wide, flat, 

 margins show segmentation jjlainly, but it is not carried across the dorsum, very 

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

 Same general sha])e as those of the winged female, but larger, light yellow to 

 concolorous with body, length 0.08 mm., width of the base 0.09 mm., width of 

 the mouth 0.05 nnti. Usually slightl\' longer than broad. Legs — Slender and 

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

 colorous with body, length 0.05 mm., width of base 0.065 mm., with few hairs. 



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

 many large tubercles, each su))porting 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 winged forms were exceedingly rare. This scarcity 

 is probably due to the ravages of the internal and predaeeous enemies, which 

 were exceedingh' numerous both last year and this summer, the larva" of a syrphid 

 fly being predominant. On Septmber 14, 1911, I took this species in small num- 

 bers from Salix 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 what is 

 known as the McGrath Estate. 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 the fall along the Santa 

 Clara River near Santa Paula, Cal. 



Date of Collection — July 1, 1910, and September 14, 1911- Serial number 10. 



Because of its long antennal filament and other characters which exclude this 

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

 Micrella. Having never collected what I believe to be the true Chaitophorus 

 Monell, and without comparative material except published descriptions, 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. 3, 1910). Because of his valuable aid in this work 

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

 the descriptions of Chaitophorus viminalis Monell and its synonym Chaitophorus 

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



