312 PROCEEDINCIS OF THE NATIONAL MUSEUM. vol. xxxi. 



59. Wings with weak yellow reflection; pubescence abundant, golden or coppery. 



Froterosplu'x brasilimium (Saussure) (p. 412). 

 Wings without yellow reflection; pubescence pale yellowish, very sparse. 



Protcroaphex nudum (H. Fernald) (p. 382 ). 



60. Pubescent l)and present on nietapleuron along stigmatal groove 61. 



Without such a band 63. 



61. Abtlomen entirely red 62. 



Hinder segments of abdomen black . Proterosphex ichneumoneum ( Linuicus ) ( p. 399 ) . 



62. Wings more or less fuliginous. 



Proternsphex Ichneinnoncum fithriventris (Guerin) {p. 403). 

 Wings quite hyaline, with a weak yellow tinge. 



Proterosphex !chrieu)noneum aurifuum (Perty) (p. 403). 



63. With golden or coppery pubescence ..Protero,sy)/(e.r jHaximiltani (Kohl) (p. 397). 

 Pubescence silvery; usually almost entirely absent. 



ProterospJicx asluneadi, new species (p. 389). 



64. Abdomen black 66. 



Abdomen in part or wholly red 65. 



65. Pubescence golden, abundant Proterosjjltex lautum (Cresson) (p. 371). 



Pubescence silvery white Proterosphex texanum (Cresson ) (p. 414). 



66. Longer hairs of thorax gray 67. 



Longer hairs of thorax wholly l)lack 68. 



67. Wings quite fuliginous, with bluish or violet reflection; cubital vein of hind wing 



well developed beyond transverse cubital. 



Proterosphex cJtichimecum (Saussure) (p. 407). 

 Wings nearly hyaline; cubital vein almost wanting beyond the transverse cubital. 



Proterosphex texanum (Cresson) (p. 414). 



68. Wings yellow Proterosphex caiiginosum (Erichson) (p. 403). 



Wings deep fuliginous with violet reflection. 



ProterospJiex peiisylranicurn (Linnteus) (p. 405). 



DESCRIPTIONS. 



The lists of literature of these insects g-iven b}' Kohl, and particu- 

 larly b}' Dalhi Torre," are so full that it has not seemed necessary to 

 give complete lists here. Accordingly only the more important older 

 foreign references are given, though it has been my intention to make 

 the American references and those published since Dalla Torre's list as 

 complete as possible. 



The characters given for the subgenera are correct for American 

 forms, but would need moditication if applied to certain Old World 

 species. 



Genus CHLORION Latreille 



C/iZorion Latreille, Hist. Nat. Crust, et Ins., Ill, 1802, p. 3,33. 



Type. — Sphex lobatus Fabricius, Syst. Ent., 1TT5, p. 3-1:8. 



This being the only genus of the Chlorionina?, the description of the 

 external anatom}^ already given will apply here and need not be 

 repeated. 



a Catalogus Hymenopterorum, VIII. 



