1913] Agromyza and Cerodontha. 289 



15. Agromyza immaculata Coquillett. 

 Plate XXVIII, Fig. 3. 

 Syn: Odinia immaculata Coquillett, Jour. N. Y. Ent. Soc, Vol. X, 1902, p. 185. 



Female: Frons yellow, or reddish yellow, almost parallel-sided, in 

 breadth distinctly, but not greatly, more than one-third the head width; 

 ocellar region black ; orbits whitish ; entire frons opaque ; orbital bristles 

 strong, only three pairs anterior to lower ocellus; the lower pair of 

 which are incurved; face and cheeks pale yellow, the former almost 

 perpendicular and with indistinct keel, the latter distinctly higher 

 posteriorly than anteriorly, at middle less than one-third as high as eye 

 height; marginal mouth bristles distinct, vibrissa not much longer 

 than other bristles; antennas yellow, brownish on upper and outer sur- 

 faces, dorsal bristle on second joint distinct, but no other noticeable 

 bristles present; third joint of moderate size, more than twice as long 

 as second, regularly rounded at apex, distinctly longer than broad; 

 arista brown, with almost the basal third swollen, lanceolate, bare, in 

 length as long as from its base to vertex; proboscis and palpi yellow, 

 the latter with 2-3 weak hairs at apex. Mesonotum opaque gray, the 

 space between the dorso-central bristles opaque, yellowish, with the 

 appearance of pollinosity; four pairs of strong dorso-centrals present, 

 which are in parallel rows, and but little weaker anteriorly, two rows 

 of bristles between dorso-centrals, which are regular, equally spaced 

 from dorso-centrals and from each other, and are not continued beyond 

 middle of disk; besides the other normal bristles there are only 3-4 

 small setulas laterally beyond the dorso-centrals; humeri yellow, with a 

 black spot, lateral margins of mesonotum yellow; pleurae yellow, a 

 longitudinal, elongate spot on middle from propleuree over mesopleurag, 

 a large triangular spot between fore and mid coxas, a spot above hind 

 coxae, and a less distinct one below wing base; squamse brownish, fringe 

 brown; scutellum concolorous \vith disk of mesonotimi, the yellow 

 central stripe more distinct and, narrowly, much paler, with more the 

 appearance of ground than surface color, in shape the scutellum is sub- 

 triangular, flattened on surface; four marginal bristles present; post- 

 notum anteriorly yellow, posteriorly shining black. Abdomen brown- 

 ish with the posterior margins of basal four segments narrowly, and 

 apex of sixth broadly yellow, or the sixth entirely yellow and the others 

 broadly yellow at apices; ovipositor glossy brown, shorter than sixth 

 segment; all segments with numerous hair-like bristles. Legs yellow, 

 marked with brown ,on base of fore coxae, upper surface and base of all 

 femora; tibiae and tarsi more or less brownish tinged; mid tibiae without 

 the posterior bristles. Wings grayish on anterior half; subcostal vein 

 indistinct; first costal division one-third as long as second; outer cross 

 vein distinctly beyond end of first vein, and at about twice its own 

 length from inner cross vein, first division of fourth vein shorter than 

 second, first section of fifth vein about three-fourths as long as last 

 section; third and fourth veins subparallel, only distinctly divergent 

 at extreme apices. Halteres pale yellow. 



Length, 2 mm. 



