1864.] 



401 



quadrate, G-sided, central area; ou each side, just above the insertion of 

 the posterior coxae, a rather large, black tubercle; tegul« longitudinal, 

 yellowish-ferruginous. Wings ample, dark fuscous, with a brilliant 

 brassy gloss, and a more or less deep violet reflection ; beneath the 

 stigma an oblique, subhyaline dash, sometimes extending, irregularly^ 

 to the posterior angle of the wing, the base is sometimes subhyaline, 

 and the large posterior basal cell of the hind-wing is entirely hyaline ; 

 nervures blackish, stigma ferruginous ; areolet large, rhomboidal. pro- 

 longed towards the base of the wing. Legs ferruginous, the posterior 

 coxae, trochanters and femora, darker ; the four anterior coxas varied 

 yellowish ; tips of ali the femora, and the tibiae and tarsi, orange-yellow, 

 the extreme tips of the latter dusky. Abdomen elongate, convex, cla- 

 vate, shining, with a more or less distinct purple iridescence, and clothed, 

 especially towards the tip, with a very short and fine yellowish-serice- 

 ous pubescence; apical margins of all the segments narrowly yellowish, 

 sometimes obsolete, the incisures between the segments rather deep and 

 blackish, less distinct towards the tip, which is broad and robust; be- 

 neath, the segments are yellowish, with large, lateral, blackish stains; 

 ovipositor as long as the abdomen, stout, black, valves orange-yellow, 

 their apical third black. Length 8i — 10^ lines; expanse of wings 

 13—18^ lines. 



Male. — Resembles the female, but is smaller, the face entirely, the 

 pectus, the upper part of the pleura, two distinct central lines on the 

 mesothorax, as well as its lateral margins, and the four anterior legs, 

 including their coxae, are bright yellow; the apex of the first and second 

 abdominal segments are more broadly yellow, and the lateral blackish 

 stains on the venter are smaller; the abdomen is more slender and sub- 

 clavate; the antennae are as long as the body, without any annulus, as 

 in the female, and more or less blackish above towards the apex, and 

 the wings are more varied with hyaline and subhyaline. Length 7 2 — 8 

 lines; expanse of wings 13 — 14 lines. 



Hah. — New York, (James Angus); Pennsylvania, (Geo. Newman); 

 Delaware, (Dr. T. B. Wilson). Five specimens. (Coll. Ent. Soc. Phil). 



A large and fine species, easily recognized by its dark fuscous wings, 

 more or less varied with subhyaline. 



