328 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. sxxi. 



last four dorsal abdominal plates showing- more or less black, the 

 two anterior ones somewhat mottled with forruginous and somev/hat 

 sericeous. 



Length. — Females, 16-23 mm.; male (only one seen), lt> mm. 



This species like the last has a wide range, but is not at all com- 

 mon. I have seen specimens from Texas, California, Colorado, 

 Kansas, and ''Can." 



The absence of black on the abdomen seems to be the onl}' character 

 which separates this species from ahdominalis and in some cases the 

 hinder part of the abdomen is nuich darker than in others though it 

 could hardly ])e tei'med ))lack. It is ver}^ probable that with a larger 

 series the two species will prove to be the same, in which case the 

 name ahdoniinalU will hold by " priority of place." 



The following species is also very closely related to this, and ma}^ 

 prove to be only a variety of it: 



CHLORION (PALMODES) PR^ESTANS (Kohl). 

 Sphex {PalmoiU'K) jirccstans Kohl, Ann. natur. Hofnius. Wien, V, 1890, p. 323. 



T^/jx\ — Described from one (?) specimen in the Hamburg Museum, 

 taken in California. 



Large, black except for the pale ferruginous, almost yellow, abdo- 

 men. Wings strongly tinged with yellow. Hairs black. 



Female. — Head black, large, almost oblong when viewed from above, 

 slightly excavate between the e3xs; clypeus broad, slightly convex, its 

 anterior margin with pronounced lateral sinuations and a large central, 

 truncated lobe; the anterior margin reflexed and smooth; the remainder 

 with numerous coarse punctures and long, stout, black hairs; frons 

 excavated laterall}', with an evident frontal suture; its surface with 

 numerous rather coarse and many very minute punctures and quite 

 long hairs; frontal suture continued behind the median ocellus to a 

 slightly arched transverse groove; an oblique groove passes from the 

 frontal suture to the end of the transverse groove on each side of the 

 ocelli, thus inclosing the latter in a triangle; distance between the 

 lateral ocelli about equal to that from the ocelli to the eye; vertex 

 sparsely black pubescent, and with quite numerous, long hairs; cheeks 

 quite wide above, narrowing rapidly below; with numerous long hairs; 

 e3'es parallel, not converging below; antennae black, the filament gray- 

 ish-sericeous; scape and pedicel dull, faint ferruginous beneath, the 

 former with a few short, rather stout hairs; relative lengths of the 

 filament segments 3^5 #45 ¥05 h^ mandible black, long, stout, three 

 toothed, the middle tooth the smallest, with a groove from the base 

 nearly to the middle tooth on the anterior face, from which arise a 

 few hairs; a slight groove is also present near the ventral edge. 



7y<07'«a?.— Neck rather short, quite stout, making nearly a right angle 

 with the collar; collar broad, thick; its dorsal edge rounded both from 



