286 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sex. 



fainter one near the middle; hind metatarsi dark brown 

 except the tip; last two joints of the tarsi blackish; spines 

 under the hind femora strong and black; base of hind coxae 

 darkened in some specimens. Wings smoky hyaline with a 

 very distinct blackish spot just outside the anterior cross- 

 vein and a small spot in the submarginal near the tip of the 

 wing (see fig. 29) ; apical half of wing smoky brown around 

 the border, the stigma dark; the spot near the anterior 

 cross-vein varies in size. 



Female : Markings almost as in the male. First abdomi- 

 nal segment and posterior part of second darkened, the rest 

 a reddish color; ring on the hind femur paler; base of abdo- 

 men narrow but suddenly widening, the third and fourth seg- 

 ments much wider than in male. Frons yellow and wider 

 than in male. 



Holotype, male, No. 839, Mus. Calif. Acad. Sci., F. R. 

 Cole, collector, June 4, 1917; allotype, female, No. 840, 

 Mus. Calif. Acad. Sci., F. R. Cole, collector, Hood River, 

 Oregon, May 25, 1917. 



Type locality, Hood River, Oregon. 



This species is quite distinct from other described forms, 

 especially in the wing markings. As in the other species the 

 vein closing the first posterior cell has a characteristic 

 angle. 



536. Sphegina rufiventris Loew 



Mt. Jefferson, VII-15 (Bridwell) ; Mary's Peak (Lovett) ; 

 Hood River, V-20 (Cole). The two commonest species at 

 Hood River and vicinity are undescribed forms and will 

 be described in a later paper. 



537. Neoascia globosa (Walk.) 



Mt. Hood (Bigot); Corvallis (Lovett). Common in 

 April and May in low marshy areas and about margins of 

 small lakes. "Large series taken at Hood River in May" 

 (Cole). 



538. Brachyopa gigas Lovett 

 Corvallis, IV (Thompson). 1919, Proc. Cal. Acad. Sci., 

 Ser. 4, IX, p. 243. 



