no. 1837. NEW SPECIES OF WASPS— ROHWER. ' 553 



Family EUMENID^. 

 Genus PTEROCHILUS Klug. 



PTEROCHILUS MORRISONI Cresson. 



Pterochilus morrisoni Cresson, Proc. Ent. Soc. Acad. Nat. Sci. Phila., April, 



1879, p. xix. 

 Pterochilus favobalteatus Cameron, Ponoma Journ. Ent. Col., vol. 1, No. 3, 1909, 



p. 34. 



Specimens of Pterochilus morrisoni collected in Colorado (one from 

 Rifle, which is in the Transition Life Zone, collected July 2, 1908, by 

 S. A. Rohwer, and others without definite data) agree even better 

 with Cameron's description of P. fiavobalteatus than they do with 

 Cresson's description of P. morrisoni. There seems to be no doubt 

 about the identity of the two forms. 



PTEROCHILUS SENECONIS, new species. 



Related to Pterochilus morrisoni Cresson, but may be separated by 

 the sharper angles to the truncate part of the clypeus, whitish mark- 

 ings, and small pale spot on the mesopleurse. 



Female. — Total length about 8 mm. Clypeus in outline pentagonal, 

 wider than long, with shallow, sometimes confluent punctures, apex 

 truncate, the lateral angles sharp ; front somewhat produced between 

 the antennae, with close, rather large punctures, vertex and cheeks 

 more sparsely so; impressed line from anterior ocellus short and 

 feeble; occiput carinated, arcuate; antenna? very robust, the third 

 joint subequal with the two following; thorax punctured similar to 

 the front, notauli present only posteriorly; sides of pronotum irregu- 

 larly punctured; metanotum rounded, perpendicular; abdomen finely 

 reticulate, with small, well-separated punctures better defined on the 

 apical margins, second segment wider than long. Black; spot on 

 clypeus, mandibles except piceous apices, inner orbits to emargina- 

 tion of eye, spot on posterior orbits, scape beneath line on pronotum 

 narrowed within, tegulae, spot below, two spots on scutellum, line on 

 metanotum, spot on lateral posterior face of propodeum, all the dorsal 

 abdominal segments apically, second ventral apically, and lateral 

 spots on three following whitish ; legs black, tibiae except spot within, 

 and tarsi yellow; flagellum rufo-ferruginous beneath. Wings dusky 

 hyaline, venation basally pale, apically dark brown. 



Paratypes show the clypeus may be almost or entirely black, the 

 second ventral segment with the band interrupted. 



Male. — Total length about 8 mm. Differs from the female in the 

 entirely pale clypeus, orange-colored flagellum, four anterior femora 

 being pale beneath, and ventral segments two to six with a pale 

 apical band. The clypeus and thoracic markings are yellowish. 



