OF WASHINGTON, VOLUME XV, 1913. 51 



Ohio and Iowa as well as doubtfully determined specimens from 

 Little Rock, Arkansas and Montreal, Canada. 



As two of the eight or ten infested seed heads mentioned above 

 contained pupae of a hymenopterous parasite the percentage of 

 parasitism appears to be quite large. Adults of the parasite 

 issued a few days later and were identified by Mr. Viereck as the 

 Sigalphus curculionis of Fitch. 



EASTERN SPECIES OF RACHICERUS 



The three species of the East occur near Falls Church, R. flav- 

 icollis at Glencarlyn in July; R. obscuripennis L. at Great Falls, 

 fairly common, flying low and slow in June; and R. nitidus John, 

 also at Great Falls in June. They may be separated as follows: 



1. Thorax yellowish, legs (except tips of tarsi) yellowish; antennae 



of cf pectinate, 9 hardly so flavicollis Halid, 



Thorax dark, only humeri yellowish 2 



2. Legs (except tip of tarsi) yellowish, thorax shining black, stigma 



and cloud beneath prominent; antennae hardly pectinate 



nitidus John. 



Femora and tibia more or less obscured; thorax dull blackish, 

 stigma not prominent; antennae of d* strongly pectinate, of 9 

 less so obscuripennis Loew 



R. obscuripennis varies, much in size, some females being twice 

 as long as others. 



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ASILIDS CATCHING HYMENOPTERA 



Poulton has listed a considerable number of Asilids that com- 

 monly capture Hymenoptera. Besides his records are those of Cock- 

 erell, Daecke, and Laurent in Entomological News, and the oft- 

 quoted habit of Promachus in catching the honey bee. At Falls 

 Church I have taken Deromyia ternatus on three occasions with 

 a species of Vespa, and once with a honey bee; and Mallophora 

 claucella with a species of Epeolus. 



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