1-865.] 145 



pressed and sharp; tegulae dull ferruginous. Wings fusco-hyaline, the 



uervures fuscous. Legs deep yellow, more or less silvery-sericeous; 

 coxfe, trochanters, most of the femora, and a line on the posterior tibia? 

 behind, black or piceous. Abdomen shining black, iridescent, the four 

 basal segments with a deep yellow, sinuate fascia, interrupted on the 

 disk, the interruption gradually wider towards the apex; on each side 

 of the fifth segment an ovate deep yellow spot; apical segment entirely 

 black ; beneath, the second and three following segments with a la rue 

 triangular lateral yellowish spot, gradually smaller towards the tip. 

 Length 7 lines; expanse of wings 11 lines. 



Male. — Like the female, with a yellow spot on each side of the pleura 

 beneath the fore-wings, the fifth segment of the abdomen banded like 

 the fourth, and the sixth segment with an ovate spot on each side like 

 the fifth segment of the female, the first ventral segment has a well de- 

 veloped, acute, central carina at the extreme base, and the last segment 

 has a small acute tooth on each side. Length 6 — 7 lines ; expanse of 

 wings 9] — 11 lines. 



Collection. — Ent. Soc. Philad. One 9, two % specimens. 



I have referred the specimens from which the above description was 

 tak<m to M. dissecta of Dahlbom. with doubt, as the short diagnosis 

 given of that species, although answering to the species in some respects, 

 is too meagre to render their identity certain. 



Fam. NYSSONIDiE. 



Genus STIZUS. Latr. 

 Stizus Hogardii, Latr. 



Stizus Hogardii, Latr. Gen. Crust, et Ins. iv, p. 100, pi. 13, fig. 12, £> . St. Farg. 

 & Serv. Eneyel. Meth. x, p. 496. Smith, Brit, Mus. Cat. 

 Hym. iv, pi. viii. fig. 4. 

 Hogardia rufescens, St. Farg. Hym. iii, p. 289, pi. 28. fig. 5: Guer. LaSagra*s 

 Hist. Cuba, Ins. p. 765. 

 Collection. — Ent. Soc. Philad. Two 9 .two % specimens. 



Genus NYSSON, Latr. 

 Nysson armatus. n. sp. 



Black, clothed with a very fine, appressed, sericeous pubescence, very dense 

 and silvery on the face and golden on the metathorax, the latter armed on each 

 side behind with a long acute spine: a transverse spot on each side of the three 

 basal segments of the abdomen and the extreme apical margins of all the seg- 

 ments above, pale testaceous: wings fusco-hyaline: legs dull rufous. 



Female — Black, opaque, distinctly and closely punctured, densely 

 pubescent; the vertex and cheeks clothed with fine golden pubescence, 

 the face and clypeus with dense bright silvery pubescence ; antenna? 

 stout, piceous. Thorax densely and rather roughly punctured ; ante- 



