38 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



lateral areas finely but irregularly striate anteriorly, coarser apically 

 and rugoso-reticulate at curves; eps 2 more finely and irregularly 

 longitudinally striate than in the preceding, the lower parts, eps 1, 

 distinctly alutaceous and rather closely punctured on disk. Petiole 

 hardly as long as in punctifrons, with very faint indications of 

 dorsolateral sulci, and the sides not so definitely vertical. Legs and 

 wings normal. 



Length, 8 mm. 



Tijpe.—V.S.'^M. No. 44216, from San Diego County, Calif., 

 April (Coquillett). 



PSEN (MIMESA) IMPRESSIFRONS. new species 



Male. — Similar to edentatus^ but the fore and mid tibiae are not 

 entirely brownish yellow, the color being as in punctifrons. 



There is a rather noticeable impressed line in front of the frontal 

 tumid area between the posterior ocelli that is not evident in 

 edentatus, and the mandibles have a short but quite evident preapical 

 inner tooth. Petiole slightly longer than in ed^ntatus^ with quite 

 distinct sulcus on each side above. 



Length, 8 mm. 



Type.— U.S. l^M. No. 44217, from Perry, Wash., August 27, 1922 

 (M. C. Lane). 



Another specimen which has some of the features of this and the 

 preceding two species, the pronotum having a very distinct angle 

 though not toothed, differs from punctifrons in having the post- 

 ocellar tumid area, and from both the other species in having the 

 mesonotum glossy and without evident shagreening. The petiole 

 of the abdomen is also shorter, in fact so much so that it would 

 place the species in another group. I deem it unwise to describe the 

 species from the single specimen available, though I am practically 

 certain that it will piove distinct. The antennal flagellum has the 

 segments 2 to 5 more elevated centrally when seen from the side 

 than do any of the three species just dealt with. 



Locality. — Hood River, Oreg., June 30, 1921 (C. C. Sperry). 



In collection of the Bureau of Biological Surve5^ 



PSEN (MIMESA) ARGENTIFRONS (Cresson) 

 Plate 1, Figure 17 



Mimesa argentlfrons Cresson, Proc. Ent. Soc. Philadelphia, vol. 5, p. 487, 1865. 



I am not certain that the male which I accept as this species is 

 correctly placed, but it agrees well with the description and is from 

 Colorado, the type locality. 



