882 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



juid hairs are golden in front, but become paler behind; in one .speci- 

 men seen there is a trace of the vein entering the median cell of the 

 hind wing from the cubital vein. The size is about that of the typical 

 form or perhaps a little less. 



The ha1)itat of this subspecies is now extended northward from 

 Argentina and Brazil, from whicii countries it has already been 

 recorded, by the discovery of a specimen in the collection of the 

 American Entomological Society from Mexico, the exact locality not 

 given. 



CHLORION (PROTEROSPHEX) NUDUM (H. Fernald). 



Sphex )tudus H. Fernald, Psyche, X, 1903, p. 201. 



Types. — Described from six male specimens. These cotypes are 

 now one each in the collections of the U. S. National Museum, Ameri- 

 can Entomological Society, and the Massachusetts Agricultural Col- 

 lege, Amherst, Massachusetts, and three in the collection of their 

 captor, Mr. J. C. Bridwell. 



Insects of medium size; body black; legs beyond and including the 

 outer ends of the femora yellow ferruginous except the last tarsal seg- 

 ment and claws, these and the proximal leg* segments being black; 

 pubescence pale straw color, almost silver}^; hairs j^ellowish-white; 

 wings nearl}' hyaline, the front pair slightly brownish. 



Female. — Unknown; probablv Chlorlon {I*/'ofej'(Mj>/i':/') l>r!<hrelll H. 

 Fernald. 



Male. — Head black, covered with long, ^^ellowish-white hairs; clyp- 

 eus somewhat arched laterally, its anterior margin rounded at the 

 sides, transverse or even slighth" emarginate in front, not rellexed, its 

 surface quite tliickh^ covered with pale straw pubescence and with 

 man}^ quite long, yellowish-white hairs; frons similarly clothed with 

 pubescence and hairs to about the level of the insertion of the antennie, 

 and al)ove them at the sides, with a rather scattered tuft of long hairs 

 on the middle line just above the antennae; frontal suture perceptible 

 for a short distance below the median ocellus; the upper part of the 

 frons l)lackis]i sericeous, dull; vertex and cheeks rather linely punc- 

 tured and bearing quite long, whitish hairs, longer and closer on the 

 lower part of the cheeks, which are nowhere half the width of 

 the eye, and which retreat sharply toward the neck, making the out- 

 line of the head as seen from above quite oval; antennae black, the 

 scape with short, pale straw-colored hairs; the first segment of the fila- 

 ment longest; mandibles black at base and from the l)ases of the teeth 

 to their tips; elsewhere ferruginous. 



Thora,i;. — Collar with faint, scattered punctures and a few pale hairs 

 and with a trace of yellowish-white pubescence on its dorsal edge; its 

 anterior face rising sharpl}^ from the neck; its posterior face some- 

 what closel}^ appressed against the mesonotum; prothoracic lobe black, 



