266 CHARLES W. JOHNSON. 



posterior margin and all the segments with a narrow lateral margin ; tlie mark 

 ings on the second segment are sometimes widened at the lateral margin fomiing 

 a triangle at the posterior angle; venter greenish. Femora black, tij) of the 

 femora, basal half of the tibise and tarsi, yellow ; outer half of the tibite and tarsi 

 brown ; in some specimens the tibise and tarsi are almost a uniform yellow, or 

 yellowish I'ed ; in the latter case the posterior coxge are more or less yellow. 

 Wings hyaline, veins yellow, discal cell emits two veins, third longitudinal vein 

 simple. 



5". — Face black with white pile, front black with yellow pile; frontal longitu- 

 dinal fossa with its margins and a spot on each side of the ocelli, yellow; pubes 

 cence of the thorax short and of a golden-yellow ; margin of the scutellum promi- 

 nent and yellow. Legs usually lighter than the % . 



Philadelphia, May 15 ; Brookline, Mass., May 27, June 12 (Heii- 

 shaw) ; New York and Franconia, N. H. ( Mrs. Slosson ) ; Algon- 

 quin, 111., June 8 (Dr. W. A. Nason) ; Brookings, S. D. ; West 

 Point, Neb., April (Aldrich) ; jNIinnesota (Amer. Ent. See); Caro- 

 lina (Olivier). 



The black femora and the more regular size of the abdominal 

 markings distinguishes this species from the preceding, "except the 

 ' Kand nuihl ven braun' the description of do ntomyia intermedia 

 applies exactly to this species." MS. note of Osten Sacken, Museum 

 of Comparative Zoology. 



The species is also marked " O. critx.uro.^trlif,'" a MS. name given 

 by Loew in his collection at Camln-idge. 



Odoiitoin.yia lioo<Iiana Bigot. 



Odontomyia hoo(Hana Bigot, Ann. Soc. Ent. France, xxxviii, 1886, 2.5. 

 Length %, 9 8-10 mm. % . — Face black, shining, with long yellow pile, ver- 

 tical triangle black, ocelli yellow. Antennte black. Thorax black, shining, pile 

 yellow, long and dense on the pleurae; scutellum black, shining, apical margin 

 between the spines and the spines yellow. Abdomen black, shining, pile yellow, 

 sparse; second, third and fourth segments with a transverse yellow marking at 

 the lateral posterior margin ; lateral and posterior margins of the fifth yellow : 

 venter greenish yellow. Femora black ; tips of the femora, tibite and tarsi yel- 

 low, tibise with a medial band of black or brown, the outer portion of the tarsi 

 brown. Wings hyaline, veins reddish, discal cell emits two veins, the third indi- 

 cated only by an obsolete angle 



9 . — Face, front and vertex black, pile yellow. Thorax black, pubescence 

 short, yellow, procumbent; scutellum black, apical margin between the spines 

 and spine yellow. Abdomen black, shining, markings somewhat narrower than 

 in the male. 



Tuolumne County, California ; British Columbia (Coquillett) ; 

 Craig's Mountain, Idaho ( Aldrich i. 



This species is nearest related to 0. interrnpta Oliv. and 0. pv- 

 bemeus Day, but differs in the absence of yellow markings on the 

 front and vertex, and the less prominent margin of the scutellum. 



