No. 5. — Nciv Fossorial Ilymenoptera. 



By Nathan Banks. 



The following? pages contain descriptions of some new fossorial 

 Hymenoptera in the collections of the Museum, together with a 

 table to the sul)genera of Psammochares and a synopsis of the genus 

 Elis. Most of the new species are from the western United States, 

 and several were collected in Oregon and Washington during the 

 Northern Transcontinental Survey, in 1882. , 



PSAMMOCHARIDAE. 

 Aporinellus completus, sp. nov. 



Type.— M. C. Z. 10,004. Washington: Lone Tree, Yakima River, 

 30 June, 1882; Thorp, Kittitas \'alle>-, 10 July, 1882. Samuel 

 Henshaw. Two specimens. 



9 Very similar in structure to A. j'asclaias, hut the body (except 

 apical two segments of the abdomen^ is sericeous. The third and 

 fourth segment of antennae are a little shorter than in .1. Jasciatus, 

 but of about the same proportion to \erte.\ width. The femora and 

 tibia are sericeous, the hind tibia with the inner spur two thirds as 

 long as the basitarsus. The wings are dark at apex, and venation 

 as in A. fasciatus. The male is very slender, sericeous, the abdomen 

 black, the basal segment and apical margin to next three segments 

 sericeous; the apical segment is black (not sericeous as in A. ((Ufciattis). 



Aporinellus medlwus, sp. nov. 



Type.— M. C. Z. 10,005. Calif.: El Cajon, 1 May. E. P. Van 

 Duzee; Los Angeles, May. M. C. Van Duzee. Two specimens. 



9 Black; clypeus and basal part of the face white pollinose, the 

 white extending part way up inner orbits, posterior orbits narrowly 

 white pollinose, as also the basal third of the mandibles, middle third 

 reddish, apical third black. Clypeus truncate in front; face as wide 

 above as below, an impressed line from anterior ocellus to the antennae; 

 second plus third joint of antenna hardly equal to vertex width, third 



