42 Myron Harmon Szcoik 



abdomen is not black right across on basal half but the black area 

 has large red emarginations, forming a large black trident-shaped 

 mark on the base of the segment. It thus agrees more closely 

 with the color variety described by Cockerell as -V. I'iciiialis in- 

 frarubciis, from Corvallis, Oregon, but the hair of the mesonotum 

 is gray only very slightly tinged with ochreous (strongly brownish 

 in iiifrariibcns), tergite 6 has no obvious band, and the tubercles 

 and spot beneath are more yellow than red ; but all these are 

 apparently variable characters in this species. From A', z'icifialis 

 aldrichi Cockerell, described from Moscow, Idaho {.buials and 

 Magac:ine of Xatural History, series 8, ^^ p. S^S) , it is distinct 

 in its wholly yellow clypeus, narrow red lines on mesoscutum, 

 wholly red mesoscutellum, red emarginations on the black area at 

 base of abdominal tergite i, band on tergite 6 obsolete, etc. In 

 all these forms the scape is swollen and yellow in front, the apex 

 broad, hairy and distinctly notched, the thorax mainly black, etc. 

 A female also collected in Sioux county, Nebraska, seems to the 

 writer to very probably belong with the specimen of vicinalis, and 

 is referred there rather than given a name. The female of 

 I'icinalis has never been described, so the following diagnosis of 

 its characters is presented : 



$. Length 8.5 mm. \'ery dark red, the cheeks behind except for '. 

 narrow postorbital red line, an ocellar spot connected by narrow lines 

 with narrowly confluent spots around antennal bases which extend broadly 

 down in the clypeal sutures and isolate the suprach-peus. flagellum above 

 on about the basal half dozen joints, a narrow mesoscutal line, depressed 

 sides of mesoscutellum, nietanotum, prothorax except collar and tubercles, 

 large spots on mesosternum, metapleura and sides of propodeum to the 

 angulation, a broad median line on posterior face of propodeum which 

 joins the middle of a transverse bar across apex of propodeum, the basal 

 half of abdominal tergite 1 right across and a cordate mark on sternite 

 I, most of the coxae behind and at base, trochanters behind except for 

 a distinct narrow apical yellow line, femora in front and extensively 

 behind at base, line on hind tibiae toward apex behind, and outer face of 

 hind basitarsi, black or blackish. Joint 3 of antennae about two-thirds 

 as long as 4. Mesoscutellum feebly bilobed, as in the male. \\'ings 

 clouded, more deeply so on a broad apical band, a clear space beyond 

 submarginals, ner\-ures brown, stigma pale brown, basal ner\-ure distinctly 

 basad of transverso-medial nervure. Outer margin of hind tibiae tuber- 

 culate, their apex with four short straight spaced pale setae, the hair on 



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