110 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



LygGcerus triticum Taylor. 



Ceraphron triticum Taylor, Am. Af?ric. ISfifl, p. liOO, f. 1 ; Cn-ss. Syn. Ilyiii.. )>. 248. 



This Hy does not correspond with the above {('eniphron (le/itriirtor Say), therefore 

 I have named it ^i/icvuH, from the hotaiiiial name of wheat. It is not of sncli a 

 shining black as Mr. S.iy'.s liy, Imt is rather rusty in ijipearance from a few hairs 

 scattered over its body. In some specimens, when very fresh, the le<;s have a bright 

 tinge of yellow. The antenna^ (6, Eig.-2) are tcrmcMl sctigerons (having the basal 

 joint large) and tlie last four globular, the intermediate one lurnished with fonr 

 long bristles resembling plumes. This is a very surt; mark for distinguishing this 

 family according to European classitication. The eyes an; large in ]>roportion, the 

 paljii 3-joiuted. The fore wings have snbmarginal cells, with a laint nervure run- 

 ning to apex. The under wings have a long nervure running through and two 

 smaller ones descending to the inferior region; these are so very slight, that you can 

 only see their existence by a deep 8ha<le of the wings in a strong light, but are 

 evidently nervures, indistinct as they are. The ovipositor is retractile and tubular. 

 The fly deposits her eggs in the pupa of the Hessian fly. ( Taylor.) 



Unknown to inc, and the abovt^ description is cojiied from the Amer- 

 ican Agriculturist. Miss Tayhu- further informs us that "this fly can 

 be fouud in every wheat fiehl throughout the country, from spring to 

 autumn.'' Her description is very imperfect, and her tigure of the 

 male antenna strongly recalls the branched antenna of an Etdophus. 



Lygooerus stigmatus Say. 



rerflj)ftron 8/(jrr«rt'«.'« Say. Boston .Journ., i. p. 277; I^ec. ed. Say's Works, ii, p. 724. 

 Lifgoceriis atigmatim Ashm., Eut. Am., in, p. 9H. 

 Ceraphron stigmatus Cr.. Syn. Hym., p. 248. 



$ 9. Length, 1.4""". Black, pubescent, closely, minutely ])unctulate, 

 subopaque; abdomen ovate, pointed at tip, higlily polished, the petiole 

 striate; legs i)iceous black, the anterior tibi.e and tarsi and knees on 

 middle and hind legs and their tarsi, pnle or honey yellow. Antennae 

 in 9 slightly thickened toward tips, the flagellar joints beyond the third, 

 scarcely longer than wide ; in the 3 the first five flagellar joints dentate, 

 pilose, the first joint being about twice as long as thick, excluding the 

 short pedicel. 



Wings hyaline, the stigma semicircular, brown, the stigmal vein about 

 If the length of the stigma. 



Habitat. — Indiana; Canada. 



Specimens in Coll. Ashmead an«l National Museum. 



Recognized from spe(dmens bred by Mr. James Fletcher, at Ottawa, 

 Canada, from the raspberry aphis. 



Lygocerus uiger Howard. 



Megnspihis niger How., Ins. Life, vol. ii, p. 247., ?, f. 52. 

 ('e»-fl/>Aro« /rt^tcMm Smith, Rep. N. J. Exp. Sta., 1890, p. 502, f. 18. 



9. "Length, 1.0"'"'; expanse, .'{.33'"'"; greatest width of fore wing, 

 0.62""". Scape of antennae very long, somewhat swollen beyond middle ; 

 funicle long, curved, all joints increasing gradually in width from ped- 



