ART. 25 NEW ICHNEUMON-FLIES— CUSHMAN 3 



doubt. The specimen is said to have been reared from either Anas- 

 trefha ludens Loew or A. straita Schiner. 



RHEMBOBIUS ABDOMINALIS (Provancher) (nev/ combination) 



Phygadeuon aMominalis Provancheir, Nat. Can., vol. 6, 1S74, p. 2S0; vol. 

 11, 1879, p. 73; Faune Ent. Oau., Hym., 18S3, p. 319; Addit. Faune Eut. 

 Can., Hym., 1886, p. 46. 



In the collection of the National Museum there are 14 females and 

 6 males as follows: 1 female, Quebec (homotype, Rohwer) ; 1 female, 

 Hartford, Conn. ; 6 females, Colorado, including 4 from El Paso 

 Count}^ reared from decayed cotton wood; 5 females and 2 males, 

 Puyallup and Sumner, Wash., reared from the bulb fly, Merodon 

 eqitesfris Fabricius; 1 female, Santa Cruz, Calif., reared from the 

 smaller bulb fly, Eumerns strigatus Fallen ; 1 male. Narrows, Mount 

 Desert, Me. (C. W. Johnson, collector) ; 1 male, Westfield, N. Y. 

 (E,. A. Cushman, collector) ; and 2 males, Harney Peak and Waubay, 

 S. Dak. 



All of the specimens from Washington, the one from California, 

 one from South Dakota, and all but one of the Colorado specimens 

 differ from the typical form in having the hind femora and tibiae 

 entirely red; the western females and one from Colorado differ fur- 

 ther in the lack of the white antennal annulus, though a few show 

 traces of white at the base of one or more joints; in the Colorado 

 female that has the apices of the hind femur and tibia black the 

 extent of black is reduced and in addition the front and middle 

 femora are not at all black as in the typical form; the far western 

 males also differ from the typical eastern form in their lack of 

 white markings on the front and middle coxae and trochanters and 

 in a reduction of the extent of white markings on the face, clypeus, 

 .and scape ^ one of the Dakota specimens is typical in these respects 

 while the other is intermediate. 



The species is very closely allied to the European R. quadrispirms 

 (Gravenhorst), which, however, has the abdomen black beyond the 

 third segment. 



TRICHOCRYPTUS ATLANTICUS, new species 



Very closely allied to hicolor Cushman, with the description of 

 which it agrees except as follows : 



Female. — Length 8 mm.; antennae 4.25, ovipositor sheath 2 mm. 



Eyes not distinctly convergent below ; propodeum in profile slightly 

 .convex above; petiolar area not distinctly shorter than combined 

 areola and basal area. Scutellum white apically ; tarsi infuscate. 



Type locality. — Bladensburg, Md. 



Type.— C2it. No. 41991, U.S.N.M. 



One female taken June 23, 1916, by R. C. Shannon. 



