314 TERTIARY INSECTS OF NORTH AMERICA. 



of the upper ulnar branch is shghtly shorter than the cross-vein uniting it 

 to the radial ; the radial is parallel to the costa throughout ; a second cross- 

 vein unites the radial and upper ulnar where the former forks, as far from 

 the first cross-vein as the width of tlie wing, and the apical series of cross- 

 veins is half-way between this new cross-vein and the apex of the wing. 



Length of teguiina as preserved, 7.5™™; as restored, 8 5™™; breadth, 

 2.5™™. 



Twin Creek, Wyoming. One specimen, No. 6^, Dr. A. C. Peale. 



DOCIMUS gen. nov. (Schi/xo?). 



This name is proposed for an insect with somewhat remarkable neura- 

 tion, which reminds us somewhat of that of Walker's East Indian genus 

 Isaca. The sutura clavi is very long, reaching to the middle of the outer 

 half of the wing, while the apical cells, the only wholly diaphanous part of 

 the wing, are very long, occupying fully the apical third, and are very few 

 in number, only three reaching the apical margin, and all being bounded 

 away from the middle line of the wing by remarkably arcuate and divergent 

 veins, giving somewhat the aspect of a Psylla to the wing. The body is 

 very stout, with a full abdomen, well rounded behind, and in no way 

 pointed. 



A single species is known, or possibly two. 



DOCIMUS PSYLLOIDES. 

 PI. 19, Figs. 6, 17. 



The head is not preserved. The thorax is faintly punctate. The teg- 

 mina are fully two and a half times longer than broad; the ulnar vein forks 

 very close to the base, and where it is united by a cross-vein to the radinl 

 these two are united by another ci'oss-vein in the middle of the wing, 

 beyond which the space is separated into two longitudinal cells ; the radial 

 ends near the apex in a strongly arcuate fork, which at first curves down- 

 ward into the heai't of the wing and then turns upward, the cell opening on 

 the costal border at the edge of the apical border ; opposite the origin of 

 this fork the next and the last veins are abruptly but roundly bent and send 

 cross-veins directed obliquely inwai'd to the intermediate vein from the 

 angles, beyond which they divaricate. 



