184 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



seen laterally broad basally, dorsal margin straight for half its distance 

 then tapering rapidly to the obtuse apex; the ventral margin straight, 

 deeply sinulate at the apical third. 



MissOula, Montana. Described from two females (one type) 

 and two males recorded under Bureau of Entomology number 

 Hopk. U. S. 11504b. Material collected, January, 1913, and reared 

 by Joseph Brunner. 



Type: Cat. No. 15385 U.S.N.M. 



Stilbopoides sesiavora, n. sp. 



Differs from Stilbopoides maculiventris Rohwer in the longer- 

 first tergite, in the lack of a median depression on the basal por- 

 tion of the first tergite, in the narrower, smooth apical margins 

 of the first, second and third tergites, and in the slightly different 

 color. 



Female. Length, 12 mm. Clypeus with the apical portion smooth, 

 apical margin truncate the basal portion sculptured as the front; the lateral 

 supraclypeal areas shining, very finely punctured; the median supraclypeal 

 area mound shaped, with distinct, fine, separated punctures; head above the 

 antennae shining, very sparsely punctured; laterad of each lateral ocellus is 

 an elongate fovea; postocellar line one-third longer than the ocellocular 

 line; scape strongly dilated; third antennal joint slightly longer than the 

 fourth; mesoscutum with distinct well defined separate punctures; scu- 

 tellum with punctures more widely separated; mesepisternum shining, 

 very sparsely punctured, especially posteriorly; propodeum truncate 

 posteriorly; the posterior aspect separated from the dorsal aspect by a well 

 defined carina; posterior and lateral aspects shining, with sparse, well 

 defined, rather large punctures; the median area shining and more or less 

 U-shaped; the posterior face very sparsely sculptured with distinct well 

 defined punctures, in outline semicircular; first tergite about one-third long- 

 er than the apical width, the posterior median portion with a distinct de- 

 pression, punctured similarly to the dorsal aspect of the propodeum except 

 posteriorly they become closer; the median apical margin of the first ter- 

 gite shining, impunctate; second tergite sculptured about as the densest 

 portion of the first tergite; its puncturation becomes denser posteriorly, 

 its apical margin with a narrow, shining, impunctate band; third tergite 

 uniformly sculptured like the posterior portion of the second tergite; it 

 also has a narrow, shining, impunctate band; fourth tergite sculptured as 

 the third tergite except that the apical margin before the shining, impunc- 

 tate band is depressed into a furrow which is interrupted medianly ; fifth 

 tergite with poorly defined punctures; the following tergites practically 

 impunctate with the surface finely granular; venation and legs as in maculi- 

 ventris. Black; mandibles except apices, apical portion of the clypeus, an- 

 terior superior orbits, lateral anterior stripes on the mesoscutum, tegula>, 



