1865.] 463 



black pubescence ; metathorax densely rugose or granular ; tegulae 

 shining black. Wings hyaline or subhyaline, with a more or less deep 

 violaceous reflection, the apical margins broadly fuliginous. Legs 

 black, rather densely covered with a very fine cinereous pile. Abdomen 

 often strongly tinged with blue or purple, the upper surface covered 

 with a more or less brilliant silvery-sericeous pile, more obvious in cer- 

 tain lights; petiole long and slender. Length 62 lines; expanse of 

 wings 9 lines. 



Twenty £ specimens. May be the % of A. luctuosa Smith. 



Genus PELOPCEUS, Latr. 



1. Pelopoeus caeruleus, Linn. 



Sphex ccerulea, Lfnn. Syst. Nat. i, p. 941. 



Sphex cyanea, Fabr. Ent. Syst. ii, p. 201. DeGeer, Ins. iii, p. 589, pi. 30, fig. C. 

 Pepsis cyanea, Fabr. Syst. Piez. p. 211. 

 Chalybion cyaneum, Dahlb. Hym. Europ. i, p. 22. 

 Pelopoeus coeruleus, St. Farg. Hym. iii, p. 320. 

 Three specimens. 



2. Pelopoeus flavipes, Fabr. 



Sphcx flavipes, Fabr. Ent. Syst. ii, p. 202. 

 Pelopoeus flavipes, Fabr. Syst. Piez. p. 204. 

 Pelopoeus architectus, St. Farg. Hym. iii, p. 313. Var. 

 Twenty specimens. The petiole of the abdomen varies from entirely 

 black, through piceous and fuscous, to entirely bright yellow. 



Genus CHLOBION, Latr. 

 Chlorion cseruleum, Drury. 



Sphex coerulea, Drury, Exot. Ins. ii, p. 75, pi. 39, fig. 8. 



Chlorion cyaneum, Dahlb. Hym. Europ. i, p. 24. 



One specimen, with a brilliant blue and violet reflection. 



Genus SPHEX, Fabr. 

 Sphex laeviventris, n. sp. 



Large, robust, entirely deep black, shining; abdomen smooth and polished: 

 wings fusco-hyaline, subviolaceous. 



Female. — Large, very robust, entirely deep black, shining, sparsely 

 clothed with black pubescence ; clypeus indented on each side anteri- 

 orly, with a central truncated process; mandibles very large and deeply 

 grooved ; antennae black, sericeous. Thorax above smooth and shin- 

 ing ; pleura finely sculptured ; metathorax subopaque, and covered with 

 dense, very fine, transverse striae, regularly rounded and obtuse behind ; 

 tegulae shining black. Wings vary from subhyaline to fuliginous, often 

 tinged with yellowish-fuscous, and with a more or less deep violaceous 

 reflection; apical margins fuliginous; nervures black. Legs black, 

 very robust, shining ; tibiae sparsely, and the tarsi densely spinose, the 

 anterior pair ciliated with long slender spines. Abdomen large, ovate. 



