316 



IIY.MEXOPTERA OF AMERICA. 



[PART I. 



punctures, but the 1st abdominal segment has no suture and is 

 smaller. 



Head orbicular or even higher than wide ; the antennae inserted 

 almost below its middle. Clypeus shining, very coarsely cribrose. 

 Head and thorax coarsely punctate; metathorax a little elongate, 

 very rough; its concavity deep ; the upper cheeks more convex 

 and prominent than in vagus; the lateral ridges not so much 

 pronounced. Abdomen elongate and cylindrical, very coarsely 

 punctured, especially the edge of the 2d segment, which is rather 

 strongly reflexed ; the first segment truncate at base, not so much 

 rounded as in 0. vagus, forming a transverse rugose edge ; the 

 rugosities sometimes resembling a vestige of a suture. 



The livery is just the same as in 0. vagus, but the segments 

 3-5 of the abdomen have no yellow margin ; the clypeus generally 

 has two yellow lines near the top and the disk of metathorax a 

 basal yellow spot. In the southern provinces the wings become 

 rather cloudy. 



%. Unknown. 



Bess. a. diff. — This should be compared with 0. pedestris, 

 perennis, Kennicotianus, and anormis. 



Hab. The United States, New York (E. Norton), Tennessee 

 (Fuchs). 



US. O. ToSteciis Sauss. — Niger, gracilis, cylindricus, crasse pnnetatus, 

 fulvo-pictus ; abdominis segmentis lO, 2° flavo-Iimbatis, utrinqne fl.-ivo- 

 bipunctatis ; secundi margine maxima canaliculate-, maxima reflexo. — ■ 

 % vertice tuberculato. 



Oihjn. Toltecus Sadss. Revue et Mag. de Zool. IX, 1857, 277. 



Total lengtli, 10 mm. ; wing, 7 mm. 



Form as in 0. vagus. Body elongate, slender, and cylindrical. 



Head orbicular. Clypeus finely punctured, pyriform, termi- 

 nated hx a very small edge. Thorax elongate, convex; prothorax 

 slightly angulate ; post-scutel slightly carinated transversely. 

 Metathorax narrow, excavated; the cavity strongly punctured, 

 margined rnferiorly by two little converging carina? ; the edges 

 rounded, not sharp superiorly. The upper lateral spine of the 

 articulation elongate ; the inferior one triangular on the margin 

 of the articular cavity. Head, thorax, and first segment of the 

 abdomen, cribrose with coarse punctures ; the following segments 



