176 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



stripe, yellow, with dilately luteseent pile and pollen. Sciitellum 

 wholly reddish. Each segment of the abdomen, except the first, with 

 a black posterior fascia, on the second and third emarginate and vel- 

 vety opa(jiie, on the following; sub-sliiuiug; posterior margins of the 

 segments very narrowly yellow. Legs black; extreme tip of the fem- 

 ora, the basal half of front and hind tibire, the middle tibioe except the 

 distal third and the first joint of the middle tarsi, light yellowish. 

 Wings hyaline, the veins of the disk broadly snbfuscous clouded. 



Somewhat bronze-black, shining, clothed with ratlier long Intescent 

 pile. Front broad, concolorous, with thick luteous pile, near the ocelli 

 black pilose, on the sides anteriorly luteous })ollinose, the anterior mar- 

 gin above the antennae reddish. Face longer than in E. ohscurus and the 

 tubercle smaller, concealed beneath dilutely luteseent pollen, and 

 clothed with the same colored pile, a rather slender median stripe and 

 the cheeks black. First two joints of antennae black, third reddish- 

 ferruginous ; arista pilose. Thorax unicolorous, moderately shining, 

 wholly luteous pilose, the pile of the ])leurae, however, lighter colored. 

 Scutellum reddish, luteous pilose. First abdominal segment glaucous, 

 remaining segments shining, posterior margins of the second, third, and 

 fourth segments narrowly yellow. On the second segment there are 

 two velv^ety-black fasciae, one on the anterior margin and attenuated on 

 the sides, the other touching the posterior margin and emarginate ; third 

 segment with similar fasciae, but the anterior one is more slender. Last 

 two segments wholly shining, near their posterior margins a deeper 

 black. Pile of the abdomen chiefly black, on the first segment white, 

 on the front half of the second segment and near the anterior angles 

 of the intermediate segments pallid luteseent, on the ultimate segments 

 pallid, intermixed with black. Legs b]ack, light yellow pilose, hind 

 femora slender ; tip of the femora, front and hind tibiae at their base, 

 middle tibiae, except the tip, and the first joint of the middle tarsi with 

 the base of the second joint, light yellowish. Wings hyaline, veins 

 black fuscous, near the base of the wings reddish, a large, dilutely sub- 

 fuscous spot on the disk, stigma minutely black-fuscous. 



" The type specimen has the abdomen somewhat rubbed, so that it is 

 difficult to judge correctly of the pile." — Loew. 



Translation from the original. The single type specimen at Cam- 

 bridge is in poor preservation. The species is allied to dimidiatm. 



Eiistalis oestriformis. 



Syrphiis oeatriformis Walker, List, etc., iii, 573. 



Eristalis oestriformis Osteu Sacken, Cat. Dipt., 131, note 227, p. 249. 



Habitat— nm\8ou^s Bay Territory (Walk.). 



" Mas. Niger, thoracis pilis anticis nigris posticis fulvis, scutello fulvo, 

 abdomine jiilis albis nigris fulvisque fasciato, an tennis piceis, pedibus 

 nigris, alls limpidis fusco unimaculatis. 



" Body black : head clothed with dull tawny hairs, shining and promi- 



