48 E. T. ORESSON. 



base near the inferior nervure; legs black, tibise and tarsi brown; abdomen 

 straight, compressed, black, with a white membraneous spot at base and a 

 white band at summit of segments three and five; ovipositor short." 

 Hah. — Canada, (Coll. Provancher). 



Cepbus cinctus Norton, Trans. Am. Ent. Soc. iv, 86. — " % . — Length 0.28 ; 

 br. wings 0.56 inch. — Color black; a square spot on the nasus, a spot curving 

 around each lower orbit and on the middle of each mandible yellow: tegulae 

 and a spot under each wing, under the neck, on pectus, the sides of basal 

 plates, an irregular dentate band widest at sides, on the first, second and fourth 

 and on the sides of third, fifth and sixth, and apical segments of tergum, and 

 on the apical edge of each segment of vertex, yellow; legs yellow, growing 

 reddish towards the tarsi, trochanters and the anterior pair of femora before, 

 black; wings smoky. Antennae slightly clavate, eigbteen-jointed." 

 //a6.— Colorado. (Coll. Am. Ent. Soc.) 



Xyela senea Norton, Trans. Am. Ent. Soc. iv, 86. — "% . — Length 0.30; br. 

 wings 0.72 inch. — Antennae black, head and thorax bronze, with purple reflec- 

 tions, greenish about the face; labrum and palpi pale reddish; abdomen shin- 

 ing steel-blue; legs ferruginous, hinder tibise blackish. Third joint of antennae 

 three times as long as the six remaining joints together, basal joint arcuate; 

 head and thorax delicately, closely sculptured ; claws with a strong inner tooth ; 

 wings hyaline, nervures as in tricolor; of which this may be a variety; on one 

 of the wings there is a supplementary marginal cell." 

 Hab.— Texas. (Coll. Am. Ent. Soc.) 



Oryssns occidentalis Cress. Proc. Ent. Section, 1879, ix. — % 9-— ^'ack, 



opaque; head coarsely punctured, the vertex gibbous, crowned with six or 

 seven acute tubercles encircling the lower ocellus; clypeus acutely margined 

 at tip which is truncate; cheeks very prominent; joints 3 — 6 of antennae more 

 or less white above; thorax depressed, densely punctured; scutellum triangular, 

 acute at tip; wings smoky beyond stigma; knees and line on outer side of tibiae, 

 white, tarsi fulvo- testaceous, sometimes more or less obfuscated ; abdomen shin- 

 ing, ferruginous, basal segment black, scabrous. Length .40 — .60 inch. 

 Hab. — Colorado, Nevada. (Coll. Am. Ent. Soc.) 



Oryssns mexicanus Cress. Proc. Ent. Section, 1879, x.— 9-— Black, 

 opaque, coarsely and confluently punctured; vertex crowned with a circular 

 row of prominent tubercles around the lower ocellus, and between the summit 

 of the eyes a coarse transversely rugose prominence; on each side of the face 

 a sharply defined longitudinal carina reaching below to the acutely margined, 

 somewhat recurved tip of clypeus, converging above and connected by a cross- 

 carina below the lower ocellus, the surface within this oblong quadrangular 

 enclosure is reticulated; cheeks silvery-sericeous, a short acute carina on each 

 side above base of mandibles; posterior margin of prothorax above silvery- 

 sericeous; a longitudinal shining ridge on disk of mesothorax and another 

 shorter and less distinct on each side over the tegulae; scutellum rounded at 

 tip; wings fusco-hyaline, a subhyaline space beneath stigma; tibiae piceous, 

 tarsi dull ferruginous; abdomen rather shining, basal margin of the segments 

 rufo-testaceous. Length .60 inch. 



Hab. — Mexico. (Coll. Am. Ent. Soc.) 



