Sept., I9I3-] Melander: Synopsis of Diptera. 263 



Agromyza interfrontalis new species. 



Female. — Length 1.7 mm. Black, subsluning, the center of the front, 

 labella, scutellum except the anterior angles, upper mesopleural sutures, calyp- 

 teres and root of wings, halteres, and rather narrowly the knees, yellow; later- 

 ally the incisures of the basal segments of the abdomen becoming yellowish, 

 and the penultimate segment with an apical yellow band. Front becoming nar- 

 rower towards the antennae, the orbits relatively broad and nearly as wide as 

 the interfrontal stripe ; ocellar triangle rounded and black, the ocellar bristles 

 small, scarcely reaching one fourth the length of the front. . Cheeks piceous 

 black, about one sixth the eye-height ; a single vibrissa. Three dorsocentrals, 

 acrostichals very sparse. Last segment of the abdomen rounded, not longer 

 than the penultimate segment, the ovipositor short. No tibial bristles. Margin 

 of the calypteres a little dusky. Wings hyaline, veins dark ; third section of 

 the costa longer than the fourth section and about one third as long as the 

 second section ; discal cell small, the posterior crossvein opposite the end of 

 the first vein, the anterior crossvein before the middle of the discal cell ; seg- 

 ments of the fourth vein proportioned about one to six, of the fifth vein about 

 one to two ; the fourth vein ending at the wing tip, subparallel with the third. 



One specimen, Tacoma, Washington, August 27, 1912. 

 Structurally this species is related to hictuosa Meigen, from which 

 it differs in the color of the scutellum and of the front. 



Agromyza pollinosa new species. 



JMale. — Length 2 mm. Largely black, overlaid with cinereous brown pollen. 

 Head yellow, the occiput except laterally and below and the round ocellar tri- 

 angle black. Ocellar bristles reaching three fourths the distance to the frontal 

 suture ; four to six pairs of fronto-orbitals ; face strongly receding, carinate 

 between the subantennal depressions ; cheeks about one third the height of the 

 obliquely oval and pubescent eyes ; one vibrissa and three weak oral hairs. 

 Mouth-parts yellow, palpi broad. Antennae yellow, the third joint subreniform, 

 the arista yellowish at its base. Pleurae and notum subopaque, with grayish 

 pollen ; the narrow notopleural and meso-pteropleural sutures yellow ; bristles 

 long, four dorsocentrals, four rows of acrostichal setulae. Abdomen subshin- 

 ing, the lateral membrane yellow ; hypopygium relatively large, with two rather 

 long, narrow lamellae in the apical excision. Apex of the coxae and the broad 

 knees yellowish ; middle tibiae without extensor bristles. Halteres, calypteres 

 and root of wing yellow; wings hyaline, narrow, the veins slender but dark; 

 third section of costa longer than the fourth and about one fifth as long as 

 the second section ; anterior crossvein just beyond the end of the first vein 

 and just beyond the middle of the discal cell ; sections of fourth vein about one 

 to five, of the fifth vein subequal. 



Two specimens frotn grass sweepings gathered by Professor Wm. 

 T. Shaw at Sitka, Alaska, July 16, 1907. 



