128 'PROCEEDINGS OF THE NATIONAL MUSEUM. vol.55. 



alfalfa and related plants it would not be surprising if the two 

 species would ultimately prove to be the same. 



EUTELUS MAYETIOLAE, new species. 



Female. — Length, 2 mm. Is very similar to Eutelus hruchophagi 

 Gahan, but easily distinguished by having all the femora pale testa- 

 ceous like the tibiae and tarsi instead of blackish ; by the fact that the 

 clypeus is distinctly aciculate-striate instead of sculptured like the 

 remainder of the face ; the eyes are larger and the malar space some- 

 what less than half the length of the eye; the antennal ring-joints 

 are longer, the second and third being subquadrate instead of very 

 strongly transverse as in hruchophagi; the propodeum is rather dis- 

 tinctly wrinkled between the folds, the median carina weak, laterad 

 of the folds very weakly sculptured and shining ; the marginal vein 

 is approximately one and one-third times as long as the postmarginal ; 

 the stigmal is equal to about two-thirds the postmarginal ; the abdo- 

 men is slightly shorter than the combined head and thorax, pointed 

 ovate, practically smooth and polished, the first tergite equal to 

 approximately one-third the length of the entire abdomen. The 

 color of the head and thorax is aeneous with rather strong brassy 

 reflections, the legs except coxae pale testaceous, the wings hyaline 

 or with only a very faint discal discoloration ; abdomen blackish with 

 greenish metallic reflections on the first tergite ; antennal scape testa- 

 ceous, the pedicel and flagellum dark brown. In other respects the 

 female agrees with the description of Eutelus hruchophagi Gahan. 



Male. — Length, 1.8 mm. Agrees with description of male Eutelus 

 hruchophagi except that the area between the stigmal and postmar- 

 ginal veins is hyaline. The second and third antennal ring- joints 

 are subquadrate ; the f unicle joints a little longer than broad, except 

 the two last, which are quadrate or practically so. 



Type-locality. — Salinas, California. 



Type.— Cat. No. 21624, U.S.N.M. 



Host. — Mayetiola destructor Say. 



Described from 4 females and 15 male specimens reared from 

 puparia of the Hessian fly by Mr. C. M. Packard, and all recorded 

 in the Bureau of Entomology under Webster No. 13346. The type 

 female, one paratype female, and a broken paratype male bear Pasa- 

 dena No. 16175 and are said to be progeny of one mother. Another 

 paratype female bears Pasadena No. 16176 and is said to be the 

 parent of the allotype and eight paratype males, all of which bear 

 the same number. Still another paratype female under Pasadena 

 No. 16180 is the mother of five male paratypes. 



Mr. Packard states that the parasite oviposits in the host pupa- 

 rium. The parasite larva feeds externally upon the host larva 

 within the pupa case and after transforming emerges as an adult 

 from the puparium. 



