THE CANADIAN ENTOMOLOGIST. 153 



This species is closely related to Aleyrodes iracheifer Quaintance, 

 and runs to this species in the key (Technical Series, No. 8, Div. of Ent., 

 U. S. Dept. Agric). It differs, however, in that the wax marginal fringe 

 is not as wide, that the marginal wax pores are more even, in the shape 

 of the rim about the vasiform orifice, and in the development of the keel 

 on the dorsum. In iracheifer this keel is narrow and of even width 

 throughout, except for certain constrictions which produce an "arrow- 

 shaped" effect anteriorally. In trachoides this keel is a mere ridge on the 

 thoracic region, but very much broader on the abdominal regions. The 

 lingula o{ iracheifer is very small and poorly developed as compared with 

 that of irachoides. 



Described from an abundance of material collected by Prof. P. Cardin, 

 who states, that although extremely abundant (quite coating the under 

 surfaces of leaves affected), no sooty moid (Meliola) follows its attack. 

 Prof. Cardin is also authority for the statement that when abundant this 

 species causes the foliage to fall. 



Explanation cf Plate viii. 

 Fig. I. Aleuriscus cardi?ii. — Crawling young, dorsal view. 

 Fig. 2. A. cardini. — Pupa case, dorsal view. 

 Fig. 3. A. cardini. — Vasiform orifice. 

 Fig. 4. A. cardini. — a, fore wing ; /^, hind wing. 

 Fig. 5. A. cardini. — Antenna. 



Fig. 6. Aleyrodes irachoides. — Vasiform orifice and rim about same, 

 circles showing location of 7 spines. 



Fig. 7. Aleyrodes irachoides. — Margin of pupa case, enlarged. 



APHID NOTES FROM OREGON. 



BY H. F. WILSON, CORVALLIS, OR. 



In a general study of the plant lice of Oregon, we have found 

 abundant material in many old and some new species. We are making 

 an effort to clear up the life history of a number of them and the present 

 paper is the first of a series which we hope to get out, giving all stages of 

 as many species as possible. 



Illinoia osmaronice, n. sp. 

 This quite large aphis is found on the leaves of Osmaronia cerasiformis 

 and is quite abundant about Corvallis, Oregon. 



May. 1912 



