Journal of entomology and zoology . s to me to be different fromall the species I am acquainted with and based upon a superficialstudy, I would say that it is new.—H. F. Wilson, Corvallis, Ore-gon, March 15, 1915. THE MANZANITA LEAF—GALL APHIS Phyllaphis coweni (Cockerell) (Figs. 4-7)Synonomy and Bibliography Aphid, Cowen, J. H.—Bui. No. 31, Tech. Ser. No. 1, Exp. Sta., p. 125, 1895. Pemphigus coweni Cockerell—Cockerell, T. D. A., Can. Ent.,XXXVII, p. 391, 1905. Phyllaphis coweni (Cockerell)—Gillette, C. P., Can. Ent., XLI,p. 41, 1909. Cryptosiphtim tahcense Davidson—Davidson, W. M
Journal of entomology and zoology . s to me to be different fromall the species I am acquainted with and based upon a superficialstudy, I would say that it is new.—H. F. Wilson, Corvallis, Ore-gon, March 15, 1915. THE MANZANITA LEAF—GALL APHIS Phyllaphis coweni (Cockerell) (Figs. 4-7)Synonomy and Bibliography Aphid, Cowen, J. H.—Bui. No. 31, Tech. Ser. No. 1, Exp. Sta., p. 125, 1895. Pemphigus coweni Cockerell—Cockerell, T. D. A., Can. Ent.,XXXVII, p. 391, 1905. Phyllaphis coweni (Cockerell)—Gillette, C. P., Can. Ent., XLI,p. 41, 1909. Cryptosiphtim tahcense Davidson—Davidson, W. M., Jr. IV, p. 559, 1911. Though this species is very common and abundant, producinglarge conspicuous red galls upon the leaves of manzanita, it has 188 JOURNAL OF ENTOMOLOGY AND ZOOLOGY been the cause of much confusion as is evidenced by the number oftimes it has been described as a new species. This confusion hasbeen largely due to the peculiar body structure which has made itsclassification somewhat Fig. 4—Photograph of manzanita branch showing the galls on the leaves made by themanzanita leaf-gall aphis, Phyllapliis coiveni (Cockerell). Natural size.(Original.) Because of its abundance throughout the state anci the many in-quiries received regarding it a description in a local publication willundoubtedly be welcomed. Stem Mother(Fig. 5)During the late summer and fall of the year the young leaf gallsappear in great numbers upon the manzanita bushes as a result JOURNAL OF ENTOMOLOGY AND ZOOLOGY 189 of the attacks of the stem mothers which are numerous at that seasonand which are busily engaged in giving birth to the succeeding gen-erations. These indi\iduals are easily recognized by their broadlypyriform or robust bodies which are sometimes partially coveredwith much or little white cottony secretion. The color of the bodyvaries from amber-brown to dark olive-green with dark broken
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectentomology, bookyear1
