ORT ALIBLE — CEROXYS. 127 



feet clay-yellow ; the spot upon the end of the stigmatical cell and the 

 one covering the small crossvein, in coalescing, form a straight cross- 

 band. Long. corp. cum terebra 0.25 ; long. al. 0.21. 



Antennae altogether bchre-brownish ; third joint distinctly 

 broader than in G. obscuricornis ; arista brownish-black. Scutel- 

 lum generally yellowish, with the exception of its middle. 

 Abdominal segments, with the exception of the last one, with 

 very narrow, but very sharply limited and conspicuous brown 

 posterior margins. The first segment of the very flattened 

 ovipositor is only moderately long, very broad, and very broadly 

 truncate at the end; its coloring and its pollen are similar to 

 those of the abdomen. Feet clay-yellow ; tarsi strongly infus- 

 cated, generally paler towards the basis. The first spot upon 

 the wings reaches from the first to the fourth longitudinal vein ; 

 the spot upon the end of the stigmatical cell is more or less 

 completely connected with the spot covering the small crossvein, 

 forming a straight, almost perpendicular half-crossband; the 

 other spots have the ordinary appearance. 



Hab. Northern Wisconsin River (Kennicott). 



3. C. Similis n. sp. 9 .—(Tab. VIII, f. 23.) Polline lutescente 

 vestitus, segmentis abdominalibus postice nigro-Hmbatis, alarum macula 

 subbasali in fasciam dilatata, macula stigmaticali et limbo venae trans- 

 versalis mediae in fasciolam conjunctis. 



Covered with clay-yellow pollen ; the abdominal segments margined with 

 black posteriorly ; the spot near the basis of the wing is extended in the 

 shape of a crossband; the one at the end of the stigmatical cell forms a 

 half-crossband with the spot covering the small crossvein. Long. corp. 

 % 0.22; 9 cum terebra 0.27—0.28, long. al. 0.21— 0.22. 



First two antennal joints yellow ; the third joint is unfortunately 

 lost in all the three specimens which I have befere me, but is 

 probably of the same color. Scutellum yellow, or grayish upon 

 its middle only. The segments of the abdomen have all, without 

 exception, a brownish-black, narrow, well-defined border, upon 

 their posterior side. The first segment of the flattened ovipositor 

 is only moderately long, very broad, very broadly truncate at the 

 end; its coloring and the pollen upon it, are of the same color 

 as on the abdomen. Feet clay-yellow ; tarsi, especially towards 

 their tip, rather strongly infuscated. The first spot on the wings 

 expands into a crossband, reaching anteriorly as far as the costa, 



