NO. 1981. NE ARCTIC SPECIES OF 8AWFLIES—R0HWER. 271 



to elongate spots on the vertex between the ocelli and the eye, pro- 

 no turn, sides of the mesoscutum ruf o-f errugiiious ; tibiae and tarsi 

 ruf o-f erruginous ; wings hyaline, iridescent; venation pallid. 



Male. — Length, 2.5 mm, Clypeus with an incomplete, low carina, 

 anterior margin produced mto a very low rounded tooth; middle 

 fovea obsolete; postocellar furrow indicated; postocellar area bounded 

 laterally by fine furrows; postocellar line shorter than the ocelloc- 

 cipital line; head and thorax shining, very finely granular; fourth 

 and fifth antemnal joints subequal; scutellum not impressed; hypo- 

 pygidium broadly rounded apically. Ruf o-f erruginous ; antennae, 

 metathorax, abdomen above piceous; mandibles, clypeus, orbits 

 except spot above, postocellar area laterally, prescutum, scutellum, 

 tegula and legs yellowish. 



Biscayne Bay, Florida. Described from 1 female and 1 male col- 

 lected by Mrs. A. T. Slosson, for whom the species is named. 



Type.— Cat. No. 15383, U.S.N.M. 



XYELA NEVADENSIS, new species. 



Female. — Length to the apex of the abdomen, 3.25 mm.; of the 

 ovipositor, 1.75 mm. Clypeus with a taint median carina; anterior 

 margin in the middle produced into a low, broadly rounded tooth; 

 supraclypeal area convex; middle fovea obsolete; antennal furrows 

 complete to behind the anterior ocellus; postocellar furrow obsolete, 

 postocellar area defined laterally by line-like furrows ; postocellar line 

 distinctly shorter than the ocelloccipital line; scutellum with a longi- 

 tudinal impressed line; stigma not quite twice as long as its greatest 

 width; sheath gently tapering to the apex; body subopaque, finely 

 granular. Ruf o-f erruginous ; antennae, metathorax and abdomen 

 above piceous; clypeus, labrum, mandibles, inner orbits, four lines 

 on the vertex, triangular spot on the front inclosing a dark spot 

 located where the middle fovea should be, spots on inner margin of 

 the mesoscutum, sheath, legs below the coxae yellowish; wings 

 hyaline, iridescent; venation pallid. 



Nevada. Described from 1 female. 



Type.— Cat. No. 15384, U.S.N.M. 



XYELA SIMILIS, new species. 



Male. — Length, 2 mm. Clypeus without a tubercule, anterior 

 margin of the clypeus slightly produced into a broad rounded tooth; 

 middle fovea indicated; antennal furrows obsolete dorsally; posto- 

 cellar line subequal with the ocelloccipital line; postocellar area 

 defined laterally by faint furrows ; postocellar furrow obsolete; fourth 

 and filth antennal joints subequal; head and thorax shining, finely 

 granular; scutellum not impressed; stigma about two and one-half 

 times longer than broad; hypopygidium rather narrowly rounded 



