2 2 Myron Harmon Sivenk 



and narrowly separated yellow marks on tergites 2 and 3. differ- 

 ing further from corncUiana in the narrow and sharply pointed, 

 yellow lateral face marks, and from physura in ■ the deeply 

 notched apex and lack of blackish apical margins on tergites 1-5. 

 The c^.oi ritbi dift'ers in the mostly red mesoscutum and meso- 

 pleura, red-banded propodeum and extensively red head from 

 (^(^ of N. hella, hella callnra, volatUis, perbcUa, rhodomelas, per- 

 plexans, perplexa, etc. 



Nomada (Gnathias) subrubi n. sp. 



$. Length 6-8 mm. Dark red; small spots on sides of clypeus, lateral 

 supraclypeal sutures, area above and between antennae, oval spot involving 

 ocelli, cheeks behind, most of sides of propleura, mesopleural sutures, 

 mesosternal spots, metapleura, propodeum except broad red areas on upper 

 posterior face (occasionally including all of posterior face except median 

 line), spots on coxae behind, femoral bases all around, depressed sides of 

 metanotum and mesoscutellum, narrow anterior margin and median line on 

 mesoscutum, and basal one-third or more of tergite i right across, black. 

 Antennae red, joint 3=4. Mesoscutellum strongly bilobed. Tegulae red- 

 dish testaceous, punctured. Sculpture as in rubi. Wings somewhat clouded, 

 infuscated apically, a clear spot beyond third submarginal and third dis- 

 coidal cells, nervures and stigma dark brown, subcostal nervure black, 

 basal nervure considerably basad of transverso-medial nervure, third sub- 

 marginal cell usually not greatly narrowed above, never to a point. Legs, 

 except for black spots mentioned and distinct dusky areas on posterior 

 face of hind tibiae, red. Abdomen red, tergite 2 with small triangular 

 yellow lateral spots, occasionally tergite 3 with small lateral spots, apical 

 margins of tergites 1-4 sometimes more or less subfuscous ; apical margin 

 of tergite 5 with a dense, pale' tomentum fringe, pygidial area thinly haired, 

 pointed apically. 



($. Length 5.5-8 mm. Red ; the mandible bases, line under eye, labrum, 

 clypeus, lateral face marks extending up narrowly to level of antennae, 

 large oval spots on sides of tergite 2, usually spots on sides of 3 and some- 

 times two spots on disk of 6, pale yellow; the face above clypeus except 

 narrow orbital margins, cheeks behind, propleura, mesosternum and meso- 

 pleural sutures (the latter usually encroaching on the mesopleural disk so 

 as to reduce the red to an anterior patch and a small subtegular spot), 

 metapleura, propodeum except sometimes for red spots or stains on the 

 enclosure, depressed sides of metanotum and mesoscutellum, narrow an- 

 terior and posterior borders and broad median line on mesoscutum, coxae 

 and more or less of femoral bases behind, and basal one-third of first ab- 

 dominal tergite right across, black. Joint 3 of antennae slightly shorter 

 than 4. Abdomen, except as noted, light red, the apex deeply notched. 



176 



