SOME CHALCID-WASPS REARED FROM 

 CECIDOMYID GALLS. 



By A. B. Gahan, 

 Entomological Assistant, U.S. Department of Agriculture, Bureau of Entomology. 



All except two of the species of Chalcidoidea described 

 and listed in this paper are stated by the collectors, Mr. V. L. 

 Wildermuth and Mr. E. G. Smyth, to have been reared from 

 galls of the alfalfa gall-midge, Asphondylia websteri Felt. The 

 two exceptions were reared from unidentified gall-making 

 Cecidomyids, one being from a gall on Pluchea borealis and 

 the other on Suaeda sp. 



Of the species reared from galls of Asphondylia websteri 

 the exact host relations of some are unknown. Some are 

 undoubtedly primary parasites of the midge, while others are 

 believed to be secondary upon that host. The clover seed- 

 chalcid, Bruchophagiis funebris Howard, was reared from some 

 of the galls along with the parasites and it is possible that 

 some of the parasites may have had this seed-chalcid for host. 

 Mr. Wildermuth states that all specimens reared under Tempe 

 Nos. 2223, 2224 and 2251 were reared from dissected Asphon- 

 dylia websteri material and are therefore positively known 

 to be either primary or secondary parasites of the midge. The 

 material under Tempe No. 2264 was reared from collected galls 

 of Asphondylia websteri placed in vials, and hence the host 

 relations of this material can only be surmised. It was in the 

 lot of material under this number that Bruchophagus funebris 

 was found and it is probable as will be pointed out under 

 discussion of the species that at least one species of parasite, 

 Tetrastichus bruchophagi, came from this host. 



Family EURYTOMID^. 



Eurytoma medicaginis new species. 



Female. Length 2 mm. Head and thorax with strong umbilicate- 

 punctate sculpture and thinly clothed with short silvery white hairs. 

 Antennae rather short; scape not reaching the front ocellus; pedicel 

 conical, narrower and scarcely as long as the first funicle joint; ring- 

 joint small; funicle five-jointed, the joints, except the first, subquadrate; 

 the first joint slightly longer than broad, the fifth slightly broader than 



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