Sept., 1909.] Havhurst: Two Species of Hyalopterus. 107 



Txpe. — University of Colorado. Collected on orange, at Fall- 

 brook, California, by Y. Austin. (Comm. Prof. C. F. Baker.) 



The scales occur upon the bark in large numbers, and must be 

 highly injurious. We had at first identified this species with C. i/ii- 

 cropori Marlatt, but after some correspondence with Mr. E. R. Sasscer 

 we must follow his opinion, expressed on first seeing specimens, that it 

 is distinct. The resemblance is certainly very close, but our insect has 

 much larger dorsal pores, and the texture and size of the scale are dif- 

 ferent, that of C. micropori being very dense and chalky white. The 

 second lateral lobe of micropori, as in our insect, seems to be normal, 

 with a distinct outer lobule, notwithstanding the statement to the con- 

 trary in the original description. We are indebted to the kindness of 

 Mr. Sasscer and Dr. Marlatt for specimens of C. micropori, and to 

 Mrs. Sasscer for photographs of both species. 



OBSERVATIONS ON TWO SPECIES OF HYALOP- 

 TERUS rAPHIDID^).* 



By Paul Hayhurst, 



Boston, Mass. 



(With Plate I.) 



The only species of Hyalopterus Koch hitherto recognized by 

 American writers is, so far as I know, H. annuiinis Fabr. {H. pruni 

 Fabr.). This is the well-known greenish, pulverulent aphid of an 

 elongated form, with extremely small cornicles, which infests the under 

 side of the leaves of plum trees. An account is here given of two 

 other species which I believe have not been noticed before in the 

 United States. Hyalopterus aquilegicB-flavus (Kittel) which infests 

 the columbine and rose in Europe, was found on these plants on the 

 grounds of the Bussey Institution last fall. H. dactylidis n. sp. is an 

 elongated yellowish aphid which I have taken on orchard grass, 

 Dactylis glo'oierata, in the District of Columbia and at Forest Hills, 

 Mass. 



The winged and wingless viviparse of Hyalopterus aquilegice-flavus 



* Contributions from the Entomological Laborator}' of the Bussey Institution, 

 Harvard University, No. 6. 



