566 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



greater than the length of the clypeus; postocellar line distinctly 

 shorter than the ocellocular line; no depressions around the ocelli; a 

 distinct furrow from anterior ocellus to the facial fovea; head with 

 distinct small, well separated punctures but dull because of the very 

 fine close punctures; first and second flagellar joints subequal; 

 pronotum not crested or dentate; dorsulum, scutellum, and meso- 

 pleurae sculptured like the head, the punctures of the dorsulum larger 

 and those of the mesopleurae smaller; enclosure separated by foveo- 

 late suture from the posterior face, the base foveolate, the middle 

 furrow strong and above foveolate; propodeum laterally and posterior 

 face granular, the latter more strongly so; legs and abdomen normal. 

 Entirely black; wings dusky hyaline, venation black; gray pubes- 

 cence abundant on the pleurae. 



Male. — The male agrees with the above characters, except the 

 head and thorax are shining, the punctures smaller, and the strongly 

 foveolated middle furrow of the metathorax. The gray pubescence 

 is very sparse. 



Meadow Valley, Mexico. Collected by Mr. C. H. T. Townsend in 

 September. 



Type— Cat. No. 13745, U.S.N.M. 



THYREOPUS (CROSSOCERUS) XANTHOGNATHUS, new species. 



A very distinct little species. In some points it seems to be related 

 to angulicolle Cameron (described as belonging to Rhopalum), but 

 the shorter first abdominal segment will distinguish it at once. 



Female. — Length 5 mm. Anterior margin of the clypeus rounded, 

 without a median carina; space between the eyes at the antenna 

 less than the length of the clypeus; a depression near each lateral 

 ocellus; ocellar line shorter than the ocelocullar line; front with 

 small, rather close, distinct punctures, cheeks and occiput almost 

 impunctate; first flagellar joint longer than the second; dorsulum 

 with small punctures on a very finely granular surface; scutellum 

 and mesopleurae with small punctures but the surface not granular; 

 enclosure well defined, the base, median furrow, and bounding 

 sutures faintly foveolate; enclosure with fine oblique stria?; poste- 

 rior face and pleurae finely striato-granular; second abdominal seg- 

 ment subequal with the first; pygidium with large, distinct, separate 

 punctures. Black; mandibles (apices rufous) line on scape, tuber- 

 cles, four anterior knees and tibiae exteriorly, four anterior tarsi, base 

 of posterior tibiae and tarsi yellow; wings hyaline, slightly dusky, 

 venation black. Pubescence sparse. 



Meadow Valley, Mexico. Collected by Mr. C. H. T. Townsend. 



Type— Cat. No. 13746, U.S.N.M. 



