1865.] Ul 



segments more or less piceous or black. Length 5 2 lines; expanse of 

 wings 8$ lines. 



Collection. — Dr. J. Grundlach. Two specimens. 



Fam. BEMBECLM1. 



Genus BEMBEX, Fabr. 

 Bembex argentifrons, n. sp. 



Black ; face bright silvery ; clypeus, labrum, mandibles, collar, tegulse, tu- 

 bercles, two spots on scutellum, postscutellum, curved line on disk and spot on 

 each side of metathorax, most of legs, and broad indented bands on abdomen, 

 yellowish ; wings hyaline. 



Female. — Black, clothed with a short, fine hoary pile, most dense on 

 the head and thorax; face bright silvery in certain lights; clypeus, 

 labrum, mandibles, and scape of antennae beneath, yellowish. Thorax 

 pruinose, the collar and pleura silvery in certain lights ; collar, two 

 short lines on mesothorax, line over the tegulaa, margins of pectus, 

 tubercles, tegulae, a large mark on the pleura beneath the fore-wings, 

 incised behind, a large quadrate spot on each side of the scutellum, 

 postscutellum, a large transverse lunular mark on the posterior part of 

 the metathorax, and a rather large spot on each side behind densely 

 clothed with hoary pubescence, all yellow. Wings pure hyaline, ner- 

 vures fuscous. Legs yellow, slightly hoary ; the coxae, except a spot 

 beneath, sometimes obsolete, trochanters, basal half or two-thirds of the 

 temora, a line on the tibiae within, a short sinuate line on the anterior 

 tibiae at tip exteriorly, and extreme tips of the tarsi, black; anterior tarsi 

 broadly dilated, with a long fringe of stout blackish setae. Abdomen 

 shining, slightly hoary at base, each segment with a very broad bright 

 lemon-yellow apical band, more or less deeply and squarely emarginate 

 before on each side of the middle, that on the basal segment deeply 

 and squarely emarginate in the middle and sinuate on each side ; be- 

 neath yellowish, the base black, and at the apex of each segment two 

 black central spots, becoming larger and sometimes confluent towards 

 the tip, last segment black at tip. Length 5$ — 6 lines ; expanse of 

 wings 85 — 9 i lines. 



Male. — Resembles the female, except that the markings are all bright 

 lemon-yellow, the antennae entirely black, the two short lines on meso- 

 thorax obsolete, the mark beneath the fore-wings interrupted, the an- 

 terior tarsi not dilated, and the bands of the abdomen broader, covering 

 nearly the whole surface, those on the three basal segments stained with 

 dark green, and the second ventral segment has a strong, compressed, 

 curved tooth on the middle. Length 5j lines ; expanse of wings 9 lines. 

 Collection. — Ent. Soc. Philad. Two 9 , one % , specimens. 



