420 NEW SPECIES OF HYMENOPTERA 



the carina broadly and shallowly concave; all the joints of the fore tarsi broad- 

 ened and flattened; basal joint of intermediate tarsi flattened, not spined 

 basally; pulvilli large and distinct. Head yellow; front and vertex (except a 

 transverse irregular spot before the anterior ocellus), occiput and post-genae, 

 all black; flagellum dark testaceous above; thorax yellow; mesoscutum (except 

 a line above the tegulae) , transverse spot on pronotum anteriorly, mesoscu- 

 tellum (except an apical fascia which is much broader at the sides), metanotum 

 (except a narrow apical fascia) , propodeum (except a narrow curved fascia, 

 basally and a large spot on each side), all black; abdomen black; rather narrow 

 subapical, sinuate fascia (sometimes interrupted medially) on tergites one ta 

 six, tip of seventh tergite, first and second sternites (except lateral spots 

 basally), sinuate bands on sternites three to six (that on the second sternite 

 rather wide and deeply emarginate each side of the middle, the rest narrow), 

 and apical half of middle spine of eighth sternite, all yellow; legs almost entirely 

 yellow. Wings hyaline, reaching past the third abdominal segment. 



Allotype, one male, collected at Glen, Nebraska, July 12^ 

 1910, (J. T. Zimmer). 



Family PSENIDAE 

 Subfamily Pseninae 



Mimesa dawsoni sp. no v. 



cf. Length 6.5 mm. Front and clypeus densely silvery pubescent; clyp- 

 eus shghtly emarginate medially on the anterior margin; vertex shining, with 

 sparse, very fine punctures; space between the posterior ocelh a httle greater 

 than the distance between them and the margin of the eyes; antennae almost 

 as long as the head and thorax combined, clavate; none of the joints of the 

 flagellum prominent beneath; mesoscutum, mesoscutellum and episterna, 

 sparsely, finely punctate; enclosure of propodeum small, very poorly defined, 

 finely rugose; posterior face and sides of propodeum smooth, impunctate;. 

 posterior face with a deep, longitudinal sulcus medially; petiole of abdomen 

 about two-thirds the length of the hind femur; somewhat convex above, flat- 

 tened apically, smooth, without sulci; flagellum entirely, tegulae, apex of 

 first abdominal segment, second segment, anterior and intermediate tibiae, 

 posterior tibiae basally, and all the tarsi, testaceous; first recurrent nervure 

 interstitial with the second transverse cubitus; a proximal pale spot on the 

 stigma. 



9 . Unknown. 



Type, a male collected at Harrison, Nebraska, August 12, 1912, 

 (R. W. Dawson). 



This species is readily recognizable by having the posterior 

 face of the propodeum smooth and impunctate. It runs to 

 "group 5" in Fox's paper and is apparently nearest to unicinctus. 

 I take pleasure in naming this species for my friend Mr. R. W. 

 Dawson, who collected the specimen. 



