banks: new FOS.SORIAL HYMENOPTERA. 113 



farther apart at tips than in that species, and the abdomen lar less 

 slender. It is nearer to T. texetisis, but has no fulvous hair. Length, 

 14 to 20 mm. 



Trielis octomaculata Say. 



I consider T. lupina Cresson the same as Say's species; the markings 

 of the type agree closely with Say's figure. 



Trielis xantiana Saussure. 



Though normally this has a rather slender abdomen and the spots 

 are well separated, I consider that the broader form with spots more 

 connate, and with a pair of spots on the third ventral segment also 

 belongs here; this is T. regina Cresson. 



Trielis texensis Saussure. 



This species agrees well with T. zonaria Cress., and I think it is the 

 same. 



PHILANTHIDAE. 



Cerceris denticularis, sp. nov. 



Type — M. C. Z. 10,028. Oregon: Umatilla, June, 1882; Washing- 

 ton: Lone Tree, Yakima River, 30 June, 1882. Samuel Henshaw. 

 Nine specimens. 



9 Black, with white marks. Clypeus, except the anterior margin, 

 lateral lobes, bases of the mandibles, supraclypeal spot, sides of face 

 barely reaching above the antennae, spot under the scape, two spots 

 or line on the pronotum, tegulae, postscutellum, sometimes small 

 median spot on basal abdominal segment, others with apical band, 

 broad on sides, narrowed in the middle, subequal in breadth, and the 

 tibiae, yellow. Sometimes apex of front and middle femora pale 

 beneath, tarsi rather dark. Wings mostly hyaline, darker beyond 

 stigma, latter yellowish, veins dark. Venter black. Body densely 

 and rather coarsely punctate; head very broad, clypeus not produced, 

 lower margin emarginate in the middle, above with two minute teeth 

 as in C. grandis, but farther apart than in that species; enclosure 



