AMERICAN HYMENOPTERA. 113 



Niteliopsis parvus n. sp. 



Female. — Unknown. 



Male.— Length 3 mm. Lateral anterior margin of the clypeus 

 straight, in the middle punctured into a sharp small tooth. Middle 

 carinse rather strong extending to the middle of the clypeal tooth. 

 Head rather coarsely granular; frontal carinas prominent, of the double 

 U-shaped type. Ocelli in an acute triangle, the anterior ocellus largest; 

 no ocellar furrow. Antennas long, slender, the apical joints acuminate; 

 third and fourth joints subequal. Prothorax short, rounded anter- 

 iorly, notched in the middle. Dorsulum and scutellum closely punc- 

 tured; scutellum not impressed. Metanotum with a trianglur area 

 which is striato-rugose; metapleuras striato-granular; posterior face 

 with a middle furrow. Radial cell lanceolate without an appendicula- 

 tion; second recurrent nervure received about as far basad of the 

 second tran. cu., as the first is basad of the first tran. cu.; tran. med. 

 beyond the basal. Abdomen normal. Color black; two transverse 

 spots on the pronotum, tubercles, four anterior femora beneath apically 

 and the tibia? exteriorly yellowish-white; mandibles apically piceous; 

 narrow apical margins of abdominal segments testaceous; tegulse dark 

 brown, with a small yellow spot. Wings hyaline, iridescent; venation 

 dark brown. 



Habitat. — Boulder, Colorado, May 26 and June 1, 1908 (S. 

 A. Rohwer), flying over dry, hot, sandy soil, which was strewn 

 with small dry willow twigs. 



This species is very close to N. vierecki, but the antenna; 

 are longer and more slender than in that species, the meta- 

 notum has a triangular area, and the abdomen is black. It 

 also flies earlier in the season than does vierecki. 



Niteliopsis afflni.s n. sp. 



Female.— -Length 4.25 mm. Clypeus in the middle produced into 

 a broad, triangular tooth; middle carina not strong. Head rather 

 coarsely granular; frontal carina; not strong, rounded forming a broad 

 V. Ocelli in a little less than an equilateral triangle; a shallow furrow 

 extending from the anterior ocellus to toward the antennas. Antennas 

 slender, extending backward to the tegulas; third joint very little 

 longer than fourth. Prothorax wedge-shaped, the upper margin 

 rounded, not notched in the middle. Dorsulum and scutellum shining 

 sparsely, finely punctured; scutellum not impressed. Metanotum 

 granular, at the base with a few irregular strias; a distinct median 

 carina; metapleuras and posterior face transversely striated; posterior 

 face with a rounded fovea. Radial cell rather short appendiculated- 

 first recurrent nervure a little basad of first tran. cu.; second recurrent 

 received a little beyond the middle of the second cubital; tran. med. 



TRANS. AM. ENT. SOC, XXXV. (15) MARCH, 1909. 



