20 Myron Harmon Swenk 



except the median line; third submarginal cell usually not greatly 

 narrowed above, never to a point; size smaller, 6-8 mm., usually 



about 7 mm subrtibi 



Mesoscutellum feebly bilobed ; clypeal and supraclypeal sutures red ; meso- 

 scutum triiineate ; 5 mm. long fuscicincta 



Nomada (Gnathias) rubi n. sp. (or schwarzi subsp. ?). 



?. Length 8-9 mm. Dark red ; upper clypeal and lateral supraclypeal 

 sutures, usually connecting with oval coalesced spots above insertion of 

 antennae, spot involving ocelli, cheeks behind, most of propleura, spots on 

 anterior mesosternum, sutures of mesopleura, metapleura and contiguous 

 areas on sides of propodeum to the spiracles, narrow anterior and pos- 

 terior margins and a broader median stripe on mesoscutum, depressed sides 

 of mesoscutellum and metanotum, median band on enclosure of pro- 

 podeum, more or less of coxae behind and femoral bases all around, black. 

 Antennae red, above with ends of the joints and a line on scape dusky, 

 joint 3 subequal to 4. Mesoscutellum prominent, distinctly bilobed. 

 Clypeus and supraclypeus finely and closely punctured, rest of head rather 

 coarsely and closely punctured especially on the vertex, mesothorax punc- 

 tured hke the vertex, enclosure of propodeum minutely reticulated, longi- 

 tudinally wrinkled at base, its sides strongly curved inward. Tegulae punc- 

 tured. Wings clear, the marginal cell apically and apical margin infus- 

 cated, stigma dark brown, nervures fuscous, third submarginal cell usually 

 narrowed to a point above or almost so. Legs red except as noted. 

 Pubescence white, copious only on labrum and lower angles of propodeum. 

 Abdomen red, tergite i subimpunctate but following tergites finely punc- 

 tured basally with a small trilobed black mark with the lateral lobes longest, 

 tergite 2 with oval yellow lateral spots, 3 with similar but smaller spots, ab- 

 domen otherwise immaculate. Fringe of hair at apex of tergite 5 thin 

 and narrow, pygidial area covered with appressed hairs and pointed 

 apically. 



c?. Length 7-8.5 mm. Red ; the mandible bases, labrum, line under and 

 behind lower part of eye, clypeus except upper edge, lateral face marks 

 ending in a narrow point at antennal level, and large lateral spots on ab- 

 dominal tergites 2 and 3, pale yellow ; large area above and between an- 

 tennal bases extending down in lateral supraclypeal and upper clypeal 

 sutures, spot involving ocelli, cheeks behind, propleura, large mesosternal 

 spots, metapleura, sides and median band of propodeum, depressed areas 

 at sides of mesoscutellum and metanotum, anterior and posterior margins 

 and median band on mesoscutum, most of coxae behind, bases of hrst four 

 femora posteriorly and hind femoral bases all around, black. Antennae 

 red, scape behind and T-shaped marks on joints ^-^ black, joint 3 equal 

 to 4 or only slightly shorter. Sculpture as in the ?, lower face and clypeus 

 with silky, appressed, white hair. Wings as in the ?, third submarginal 



