256 CHARLES W. JOHNSON. 



greenish yellow; pectus black ; scutelliim yellow, base narrowly black. Abdomen, 

 greenish yellow : second, third, fourth and fifth segments with a wide, transverse, 

 black band, which does not reach the lateral or posterior margins ; posterior edge 

 of the bands on the second, third and fourth segments biarcuate ; in some speci- 

 mens this character is obsolete, or arcuated on the fourth. In the ten specimens 

 before me this character predominates, although it is not typical ; in one specimen 

 which closely resembles the type the marking on the second segment is triangular, 

 and on the other segments the biarcuate edge is wanting, and tlie anterior edge 

 does not quite reach the margin of the segment towards tlie lateral ])orti(tns 



Six females, Los Angeles County, California, and one male San 

 Bernardino Mountains, California, July 28 (Coquillett) ; Texas 

 (Henshaw, coll. L. E. Hood); Denver, Col. (Beales) ; Rapid City, 

 S. D. (Aldrich); Reno, Xev. (Hillman). 



The male from South Dakota difiers in having the tlie upi)er por- 

 tion of the face and the j)leurie black ; still it undoubtedly belongs 

 to this species. 



Odontoniyia flava Day. 



(k1o)itoiiiyi<i flava Day, Proc. Acad. Nat. Sci. Phila. 1882, 76; Williston, Can. 

 Ent. xvii, 128. 

 '^ . — Black. Head concolorous, antenn.e black. Face small, black, clothed 

 with yellowish pile ; borders of the mouth slightly reddish. Thorax black, 

 clothed with golden pile; scutellum black, the terminal spines concolorous, 

 halteres yellow. Abdomen yellow, with black median stripe, the yellow run- 

 ning in at the incisures, thus forming connected quadrangular black spots in the 

 segments: venter yellow, immaculate. Legs yellowish; femora brown; tarsi 

 black, anterior and middle tibisje with a solitary brownish ring. Wings hyaline, 

 veins yellow, third longitudinal simple, the discal cell emits three veins, the 

 posterior being rudimentary. Long. corp. 5i lin. ; long. al. 4 liu. 



Hab. — Wyoming (Dr. Williston). Original description. 



The following is Dr. Williston's description and remarks on this 

 species in the " C-anadian Entomologist." 



. ''The tvpe specimen in my collection is ])artly destroyed by An- 

 threni. I give as complete a description as it will permit. 



"Length 11 mm. Head black, face of usual size, with two obscure yellowish 

 spots below clothed with light colored pile ; dorsum of the thorax black, with 

 rather long light pile ; scutellum black, the spines of the same color rather small 

 and approximate. Abdomen black, with a i-ather narrow yellow margin, and 

 with two slender, broadly interrupted, yellow posterior cross-bands (on the second 

 and third vSegments) ; venter yellow. Legs yellow; femora at their base and the 

 distal part of the tarsi brown, the tibite in their middle with a brownish ring. 

 Wing hyaline, veins yellow, third longitudinal vein furcate, third posterior vein 

 rudimentary. 



" Como, Wyo. Resembles O. iiiequa/i-i Loew, but ditfers in the 



scutellum and abdomen. 



