276 An7ials Entomological Society of America [Vol. VI, 



2. Agromyza longispinosa, new species. 

 Plate XXX, Fig. 22. 



Male and Female: Head yellow, ocellar region, back of head, vertex, 

 and third joint of antenna black; frons opaque, very pale yellow, par- 

 allel-sided, distinctly broader than the eye; bristles as in xanthophora. 

 Third joint of antennas black, sharply contrasting with the pale yellow 

 basal joints, regularly rounded and of moderate size; arista black- 

 brown, swelling at base of terminal section elongate, almost as long as 

 length of third antennal joint, pubescence very short, pale; face almost 

 perpendicular, mouth margin not produced, cheeks distinctly higher 

 posteriorly than anteriorly, at highest part about one-third as high as 

 greatest eye-height, the row of bristles on mouth margin not very strong, 

 black, the vibrissa of moderate strength; proboscis and palpi yellow; 

 the latter slightly the darker, and weakly bristled. Mesonotum yellow, 

 with opaque black-gray mark somewhat similar in outline to that of 

 xanthophora but reaching more nearly to scutellum and more elongate 

 owing to the species being less robust than xanthophora; the male shows 

 some indication of a pale, hnear stripe carried forward from the central 

 posterior excision at either anterior angle, which may in some cases be 

 so distinct as to cause the disk to present a trivittate appearance. 

 Four pairs of very long dorso-central bristles present, the anterior two 

 pairs but little reduced, the anterior pair distinctly anterior to the 

 suture, and the second pair but little posterior to it; between the dorso- 

 centrals there are two slightly irregular rows of setulas, which are 

 exceptionally long for this genus, and which are carried back as far as 

 the prescutellar pair of dorso-centrals ; humeri yellow, with a black 

 spot; pleurae yellow with a brownish spot above and slightly behind 

 fore coxse, another large one covering the space between the fore and 

 mid coxae, and another one between the mid and hind coxce, squamag 

 with narrow black border, and brown fringe; scutellum yellow, bare on 

 disk, the four marginal bristles very long; postnotum glossy black. 

 Abdomen yellow, with apical segments darkened or with bases of all 

 segments brownish; base of ovipositor in female glossy black; hypo- 

 pygium in male glossy brownish black, of moderate size; all segments 

 with black hairs much as in xanthophora. Legs yellow, tarsi brownish. 

 Wings clear, veins 2-3 divergent, 3-4 almost parallel on last fourth; 

 second portion of costa about two and one-half times as long as first; 

 outer cross vein a little shorter than section of fourth vein anterior to 

 it; first and second sections of fourth vein vSubequal; penultimate 

 section of fifth vein distinctly shorter than ultimate. 



Halteres yellow. Length, 1.5 mm. 



Type— Cat. No. 15558, U. S. N. M. 



Locality: Male: Bear Lake, British Columbia, July 20, 

 1903, (R. P. Currie). 



Paratypes: Female — Kaslo, British Columbia, July 18, 

 1903, (R. P. Currie); female, same locality, July 7, 1903, 

 (A. N. Caudell), and one one male ex. collection, Wm. Brodie, 

 without locality, but presumably Canadian. 



Food-plant unknown. 



