20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



visible above latter when head is seen from side, the elevated portion 

 not horizontal but beveled off internally so that when it is seen from 

 below it presents a flattened surface with a ridge along its outer 

 side which is directed obliquely laterad; posterior ocellus half as 

 wide as space between it and anterior ocellus; distance between pos- 

 terior 03elli and that between either and eye subequal. Propodeum 

 smooth and e/enly rounded above, posteriorly and on sides above 

 with some setigerous punctures. Basal abdominal segment about 

 one-fifth as long as its apical width, distinctly constricted from 

 second. Second and third submarginal cells subequal, both com- 

 bined about as long as greatest length of first. 



Length, 8 mm. 



Holoty pe.^Cnrreint Creek, 8,000 feet, Uinta National Forest, 

 Utah, August 13, 1917 (J. Silver). 



Type.— C&t. No. 27924, U.S.N.M. 



There is a specimen from Fort Grant, Arizona, in the National 

 Museum which may represent another species. It has the posterior 

 ocelli a little nearer to eyes and might be considered as belonging to 

 the nitida group. 



BRACHYCISTIS (BRACHYCISTIS) DAKOTENSIS, new species 



Male. — Similar to preceding species, but stouter and darker 

 colored besides differing as stated in the key. 

 Length, 9 mm. 



Holotype.—Edgemont, S. Dak., August 6, 1915 (E. G. Holt). 

 Type.— Cut. No. 27925, U.S.N.M. 



NITIDA group 



In this group the gular carina is not elevated and flexed outward 

 at or near its anterior extremities, its anterior extremities never 

 being visible below the mandibular condyle when the head is viewed 

 directly from the side; and the vein emanating from apical costal 

 angle of stigma extends along costa at least as far as length of cross- 

 vein emanating from stigma. 



KEY TO SPEaES 



1. Gular orifice at its anterior margin hardly wider than space between anterior 



extremities of gular carina and eye, first abdominal segment over twice as 

 long as its apical width; clypeus with a central tubercle or production, 



beyond which it is beveled to edge nitida (Cresson). 



Gular orifice at its anterior margin much wider than space between anterior 

 extremities of gular carina and eye; first abdominal segment not nearly 

 twice as long as its apical width 2. 



2. Clypeus with a distinct central beveled emargination and a slight raised point 



above it in middle washingtona, new species. 



Clypeus with an elevated sharp transverse apical tip beyond which there is 

 no beveled edge 3. 



3. First abdominal segment not much more than half as wide at apex as it is 



long nevadensis Fox. 



First abdominal segment nearly as wide at apex as it is long, .glabrella Cresson. 



