1916] American Species of Xylocelia 349 



than the head; the last joint with a longitudinal furrow beneath; mes- 

 oscutum distinctly punctate, densely so anteriorly; mesoscutellum with 

 small, shallow punctures, slightly impressed medially, episterna anteri- 

 orly, quite coarsely reticulate, posteriorly finely rugose; upper portion of 

 the propodeum finely reticulate, grading off into a finely rugose sculpture 

 on the posterior face and the sides ; posterior face of propodeum with a 

 median, wedge-shaped, fairly deep fovea; abdomen with fine, well 

 separated punctures; the four apical segments somewhat pubescent; 

 wings hyaline; stigma and nervures of the anterior wings blackish. 

 Black; mandibles yellowish (except the tips reddish); tegulas and the 

 tibiee testaceous. 

 cf . Unknown. 



Type: A female collected at Omaha, Nebraska, July 15, 

 1914 (L. T. Williams). 



This species and the following one differ from the other 

 American species of this genus in the fine sculpture of the 

 posterior face of the propodeum and the episterna. They are 

 probably most closely related to americanus, from which this 

 species differs most obviously in the above characters and by 

 the furrow of the apical antenna! joint beneath. 



Xylocelia metathoracicus n. sp. 



9, Length 4.5-5mm. Labrum narrowly and deeply emarginate; 

 front microscopically granulate, with distinct well-separated punctures; 

 frontal impressed Hne distinct; vertex, occiput and cheeks sculptured 

 like the front; antennas short, slightly longer than the head, puberulent; 

 first joint of fiagellum slightly longer than the second; mesoscutum 

 shining, densely punctate anteriorly, the punctures sparser posteriorly; 

 mesoscutellum sHghtly impressed medially, rather sparsely punctate; 

 episterna anteriorly somewhat roughly sculptured, slightly reticulate 

 and strongly, deeply punctate, the sculpture tending to become finely 

 rugose posteriorly, upper surface of the propodeum finely reticulate, 

 the posterior face finely rugose, provided with a small, median, wedge- 

 shaped fovea; sides of the propodeum finely granulate; abdomen 

 microscopically, but distinctly punctate; pygidium narrow, about twice 

 as long as broad, rounded at the apex, uniformly punctured; wings 

 hyaline, nervures of anterior wings dark testaceous, stigma black. 

 Black; mandibles except the tips yellowish; tegulae and anterior tibiae 

 in front testaceous. 



cf . Unknown. 



Type: A female taken at Omaha, Nebraska, July 2, 1913 

 (L. T. Williams). Related to antennatus. Differs in having 

 the apical joint of the antennae simple, the sides of the pro- 

 podeum more delicately sculptured and only the anterior 

 tibiae in front testaceous. 



