1865.] 123 



space margined with fuscous, this is sometimes obsolete ; mandibles 

 black at tips; antennae bright yellow, involute, the second and third 

 joints more or less fuscous. Thorax fuscous, sericeous; collar with a 

 yellow spot on the disk and one on each side ; prothorax broadly mar- 

 gined behind with bright yellow, and irregularly so on the lateral mar- 

 gins ; mesothorax with two central longitudinal lines confluent behind, 

 and forming a large quadrate spot; pleura fuscous and black, with two 

 large yellow spots, the lower one the largest; scutellum fuscous, with a 

 large bright yellow spot on each side, and its apical margin obscure fer- 

 ruginous; postscutellum entirely bright yellow; metathorax short, gra- 

 dually and gently sloped behind, fuscous, with a subtriangular, bright 

 yellow spot on each extreme basal corner, and a large obscure, yellowish 

 transverse mark occupies the apical half, the prominent apical margin 

 bright yellow; tegulae dull yellowish. Wings yellowish-hyaline, the 

 costal two-thirds of the superior pair fuscous, sometimes yellowish-fus- 

 cous, darker at the tip, and slightly violaceous. Legs bright yellow . 

 base of the middle coxae, the hind coxae except tips, the trochanters 

 base of the anterior femora, the four posterior feuiora except tips, and 

 the apex of the posterior tibia), black ; all the tibiae and tarsi rather 

 thickly spinose ; incisures of the tarsal joints, and the claws, dusky; 

 Abdomen fusco-ferruginous, sericeous, subdepressed ; basal margins of 

 the second, third and fourth segments, broader on the sides, yellowish, 

 sometimes obscure; apex slightly pubescent. Length 7 lines; expanse 

 of wings 13 lines. 



Male — liesembles the female, but much smaller, the antennae porrect, 

 thickened, compressed, subcrenulate beneath, fulvous, with the six 

 apical joints black; the markings sometimes lemon-yellow; the two 

 blackish frontal lines of the head are broader; the metathorax almost 

 entirely yellowish; the wings subhyaline, not yellowish, the broad fus- 

 cous costal streak on the fore-wings very distinct, and extends down on 

 the apical margins of both wings; the legs not so thickly spinose, the 

 apical half of the posterior tibiae pale fuscous; and the bands on the 

 abdomen more or less distinct. Length 4 — 5 lines; expanse of wings 

 8^—10 lines. 



Collection. — Ent. Soc. Philad.,and Dr. J. Gundlach. Two $ , three 

 % specimens. 



Pompilus nubeculatus, n. sp. 



Fusco-ferruginous ; antennae, except tips, legs, and tip of abdomen, fulvous ; 

 wings yellowish-hyaline, with the apex and a cloud between the middle and 

 apex, fuscous ; legs scarcely spinose, the posterior tibise serrate. 



Female. — Head ferruginous, the vertex and occiput fusco-ferrugi- 



