464 [June 



convex, very robust, smooth and polished, the petiole short and robust. 

 Length 12 — 14 lines; expanse of wings 19 — 20 lines. 



Male. — Resembles the female, but much smaller, the face narrower 

 and more or less covered with a fine silvery-cinereous pile. Length 

 8? — 10| lines; expanse of wings 12 — 16 lines. 



Six $ , ten $ specimens. A fine large species, easily recognized by 

 the entirely black color and the smooth, polished abdomen. 



Genus PRIONONYX, Dahlb. 



1. Priononyx Thomae, Fabr. 



Sphex Thomae, Fabr. Ent. Syst. ii, p. 199. 

 Pepsis Thomae, Fabr. Syst. Piez. p. 209. 

 Priononyx Thomae, Dahlb. II ym. Europ. i, p. 28. 

 Five 9 , nine % specimens. 



2. Priononyx atrata, St. Farg. 



Sphex atrata, St. Farg. Hym. iii, p. 355. 

 Priononyx atrata, Smith, Brit. Mus. Cat. Hym. iv, p. 266. 

 Four specimens. 



Fam. LARRID^E. 



Genus LARRADA, Smith. 



j5. — Abdomen red, or red and black. 



1. Larrada tarsata, Say. 



Larra tarsata, Say, West. Quar. Rep. ii, p. 78. 



Two 9 specimens. The abdomen, in these two specimens, is shin- 

 ing but not polished, and the color is bright ferruginous ; the body 

 and legs have a more or less obvious silvery-cinereous pile; in one 

 specimen the tarsi have only the basal joint black, the remainder fer- 

 ruginous. 



2. Larrada semirufa, n. sp. 



Black; abdomen and tarsi, except two basal joints, rufous; wings hyaline 

 or subhyaline; abdomen polished. 



Female. — Black ; head, thorax and legs covered with a very fine 

 silvery cinereous pile, more obvious in certain lights ; face silvery ; 

 middle of clypeus prominent and polished ; mandibles piceous, shining ; 

 antennae piceous-black, sericeous; mesothorax and scutellum shining, 

 closely and finely punctured ; pleura and metathorax subopaque, seri- 

 ceous, the latter densely and very finely granular ; tegulas shining black. 

 Wings hyaline, sometimes more or less tinged with fuliginous ; ner- 

 vures black. Legs black, or piceous-black, sericeous, spinose ; tarsi. 

 except two basal joints, ferruginous, sometimes dusky. Abdomen 

 rather short, entirely rufo-ferrugiuous, polished. Length 3 — 1 lines ; 

 expanse of wings 5 — 7 lines. 



Three specimens. Smaller than L. tarsata Say, from which it is 



