2882.] «jiX [Williston. 



LL. — Thorax without median dorsal cinereous stripe, ocellar tubercle as 

 usual ; abdomen more oval. 

 N.— Head obtusely conical, front plane, foce receding, third joint of 



antennai orbicular. Doros. 



NN. — Front more rounded, face less receding, third joint of anienn;B 

 large, elliptical Xanthogramma. 



a.— Bands of abdomen entire or sub-interrupted .felix. 



b. — Bands of abdomen broadly interrupted : 



Xanthogramma divisa, sp. nov. 



(^9.— Face and cheeks yellow, or reddish-yellow. Front metallic 

 greenish-black, continued as a broad stripe to the base of the antennae, 

 somewhat expanded below, on the sides yellowish. Antenna? black, 

 somewhat reddish below on the sides of the second and third joint near 

 the base, third joint oval obtuse as in felix, but a little smaller. Dorsum 

 of thorax deep metallic green with yellow lateral stripes, pleuroe yellowish 

 with white pile. Scutellum a somewhat translucent yellow, its base nar- 

 rowly black. Abdomen : first segment with a small yellow spot on each 

 side just under the halteres, second segment with an oval spot on each side, 

 somewhat attenuated toward the middle, third and fourth with large rec- 

 tangular spots, separated by nearly their own width ; fifth with an ante- 

 rior fascia narrower in the middle and encroaching slightly upon the pre- 

 ceding segment. Legs yellow, anterior and middle femora sometimes 

 narrowly brown annulate near the base, posterior legs mostly brownish 

 or blackish, except the base of femora and knees. Wings hyaline, with a 

 smoky tinge, stigma yellowish. Long. corp. 9-llmm. Eight specimens. 

 Washington Territory. 



VII. 



J. — Small cross-vein before the middle of the discal cell. 

 2. — Antennaj short. 

 a. — Marginal cell open. ^ 

 aa. — Face tuberculate, hyperstoma not produced. 

 *. — Abdomen oval. 



Iff. — Black, or greenish-black, with yellow markings. 

 §§• — Face wholly, or in part, yellow. 



■^r.. — Dorsum of thorax uniform, without lateral stripes. 



O.— Thickly pilose species ; abdomen quite oval, broader beyond the mid- 

 dle ; face perpendicular, somewhat projecting below and reaching far 

 back under the eyes. (Basal portion of abdomen yellow, terminal 

 portion black, wings with dark spot. L. lucorum) Leucozona. 



Leucozona t^ucorum (Linne), Schiner — Meig. Beschr. iii, 313 ; Tab. 30, 

 f. 27 {Syrphus) ; Mt. Hood, Oregon ! Europe ; North America. 



00. — Rather bare species ; abdomen with yellow bands, either all en- 

 tire, or one or all interrupted. 

 P. — Eyes of male with an area of enlarged facets above ; front very 

 convex ; hypopygium very small Catabomba. 



Catabomba pyrastri (Linne), 0. S. Meig., System Beschr. iii {Syr- 



