1913] Agromyza and Cerodontha. 287 



13. Agromyza parvicella Coquillett. 

 Plate XXVIII, Fig. 4; Plate XXX, Fig. 17. 



Syn: Agromyza parvicella Coquillett, Jour. N. Y. Ent. Soc, Vol. X, 1902, p. 189. 



Female: Black, slightly shining; very slender species. Frons 

 brown, yellomsh in front, almost black at vertex, occupying more 

 than one-half the width of the head; orbits distinct, darker than frontal 

 stripe, each orbit rather more than one-half as wide as frontal stripe, 

 the bristles, four on each side from anterior ocellus, situated near 

 inner margin of orbit; the upper two stronger than the lower two, post- 

 vertical bristles divergent; frons in profile slightly projecting, face 

 slightl}' concave, mouth margin not projecting, face sub-shining, black; 

 cheeks yellowish, more than one-half as high as eye, and of almost 

 equal breadth on their entire length, marginal bristles weak, vibrissas 

 l6ng, but not strong; antennas black, second joint with the usual dorsal 

 bristle, which is hair-like, otherwise entirely bare, third joint subquad- 

 rate, of moderate length, falling short of mouth margin, gently rounded 

 at apex, arista thickened at base, very short, barely one and one-third 

 times as long as antennse, thickly, but very shortly pubescent; proboscis 

 yellow at apex, membraneous; palpi black, slightly projecting beyond 

 upper mouth margin; occiput swollen from slightly below upper margin 

 of vertex. Mesonotum subshining, four pairs of dorso-central bristles 

 present, the pair anterior to the suture, and the anterior pair behind 

 sutures slightly smaller than the posterior pairs; two irregular rows of 

 setulas between the dorso-centrals ; pleurae concolorous with disk of 

 mesonotum, but glossy on lower portion; scutelltim with four marginal 

 bristles, disk bare; squamae brownish, fringe long, brown. Abdomen 

 concolorous with thorax; first segment elongated, about twice as long as 

 second, remaining segments subequal; last abdominal segment glossy 

 black; all segments with scattered, rather long hairs, those on apex of 

 sixth segment longest. Legs long and slender, brown, trochanters, 

 apices of femora and bases of tibia narrowly yellowish; no bristles 

 present on mid tibias. Wings brownish, costa reaching only to end of 

 third vein, second costal division two and one-half times as long as 

 first; subcostal vein indistinct, obsolete on apical fifth; outer cross vein 

 slightly before end of first vein, and at about its own length from inner 

 cross vein, second section of fourth vein one-half as long as first; section 

 of fifth vein between cross veins about one-fifth as long as last section; 

 fourth vein indistinct, anal cell distinct, anal vein strong, reaching 

 nearly to wing margin. Halteres yellow. 



Length, 2 mm. 



Locality: St. Paul Island, Alaska, (Kincaid). 



Food-plant unknown. 



Redescribed from type specimen in U. S. National Museum 

 collection. This species is rather different from most species 

 in Agromyza and may be considered by some writers as be- 

 longing to some of the other families in the Acalypterate 

 Muscidse, but I believe it may be most clearly associated with 

 this genus. Like the next species it belongs to the segregate 



