October, '14] WEBSTER: UNRECORDED TOXOPTERA PARASITE 403 



which time practically corresponds to the second period of maximum 

 occurrence during August. Thus it seems very probable that the 

 apparent increase in August marks the height of the second or summer 

 generation. The habits of this species make it quite difficult to 

 determine the numbers and duration of the brood. It seems not 

 impossible that if the life cycle can be completed in forty-four days 

 that there might even be a small third generation, though no further 

 facts supporting such a possibility have been noted. 



AN UNRECORDED PARASITE OF TOXOPTERA GRAMINUM 



By F. M. Webster, Bureau of Entomology 



In the proceedings of the United States National Museum for 1888, 

 page 641, the late Dr. Wm. H. Ashmead described Wesm(plia rileyi 

 ''from six specimens in the Riley collection." No other information 

 was given in connection wdth this description to indicate the locality 

 from which the specimens came or the circumstances under which 

 they were obtained. Doctor Ashmead, however, points out that 

 "this remarkable insect agrees with the definition of this genus but 

 seems out of place in the group and more closely allied with the group 

 Aphidiina', where it may ultimately be placed." 



In the proceedings of the Entomological Society of Washington, 

 Vol. Ill, March, 1894, page 58, Doctor Ashmead erects a new genus, 

 Eupachylomma, for this and another species which he himself dis- 

 covered on Arlington Heights, on the Potomac River, in 1889. In 

 this paper relative to E. rileyi, Doctor Ashmead states that "it was 

 originally described from specimens in the collection of the national 

 Museum, labeled No. 124, July 28, Collector, C. V. Riley, but no 

 record of its habits or rearing could be found. " In order to anticipate 

 any further misconceptions, it may be stated that all of the specimens 

 of this species, used in connection with the original description or in 

 connection with this supplementary treatment of the species, were 

 reared by myself at Oxford, Ind., July 25-28, 1884. These specimens 

 appeared in a breeding cage to which growing wheat, from the fields, 

 had been transplanted on the 12th of June previous. Shortly' after 

 this wheat had been transplanted the writer discovered Toxoptera 

 graminum in the cage, as stated in bulletin No. 110, United States 

 Department of Agriculture, Bureau of Entomology, page 15. On the 

 25th of June, a single individual of Eupachylomma rileyi appeared, 

 followed by others. They were, with a single exception, submitted 

 for determination August 19, 1884, as possible parasites of Isosoma 

 grande, which was being reared in the same cage, the Toxoptera having 



