38 Myron Harmon Szi>enk 



Nomada (Nomada) depressicauda Cockerell. 



iQoS. Xoiiunhi dcf'rcssicaudn Cockerell, Enf. Nczi's, XIX, p. 7,22, ?. 



This species was described from a female collected at Falls 

 Church, \'irginia, ]\Iay 20, and has not since been recorded. It 

 is, however, a common species in Sioux county, Nebraska, flying 

 in ]May. and the writer has before him a series of a dozen females 

 from that locality. These Nebraska specimens seem to form a 

 slight color variety, not worthy of a name, but having the spots 

 on the fifth abdominal tergite coalesced to form a broad yellow 

 band above the depressed area and extending narrowly down- 

 ward along the sides of the area, while the scape is entirely red 

 without a blackish spot above. The depressed area is of variable 

 breadth, being sometimes nuich broader and sometimes no 

 broader than the space between it and the base of the segment 

 at the sides : hence, to employ this character as a sole specific 

 criterion in the dcprcssa group would be wholly inadequate. The 

 species occurs in extreme eastern Nebraska, also, and the writer 

 has before him a pair collected at Bellevue, Sarpy county, in 

 April. The female is identical with the Sioux county series, 

 except that the depressed area is not quite so well developed, but 

 the male sex of depressicauda has never been described, so the 

 following description of it is appended: 



d*. Length 9 mm. Rather dark red. the cheeks behind, an oceliar spot 

 connected by two broad lines with a facial spot which surrounds and 

 surmounts the antennal bases and extends downward in the clypeal 

 sutures from the antennal bases nearly to the lateral apices of the clypeus, 

 prothorax except collar, pectus, narrow median lines on mesoscutum and 

 on propodeum except for the base of enclosure, depressed sides of 

 mesoscutellum and metanotum, metapleura, most of posterior face of 

 hind femora together with an area on base of middle femora behind and 

 a similarly located spot on front femora, black. Clypeus, lateral face 

 marks extending broadly up to level of insertion of antennae, labrum, 

 mandibles except tips, front of ^cape and abdominal maculations. bright 

 yellow. Tubercles and suprach-peus yellowish testaceous. Flagellum 

 red with the tip of the scape and four basal joints above blackish, joint 

 3 one-half as long as 4 or slightly over. ^Mesoscutellum rather acutely 

 bilobod and brighter red than the rest of the thorax. Tegulae red. Wings 

 hyaline, strongly darkened on a narrow apical band, nervures and stigma 

 brown, the basal nervure much basad of the transverso-medial. Legs 



38 



