262 Journal New York Entomological Society. ^^'°^- ^^i- 



with two black linear lamellse. Legs stout, black, the knees sharply marked 

 with yellow. Fringe of calypteres black. Wings narrow, hyaline, veins strong, 

 the third section of the costa one and one half times the fourth ; anterior cross- 

 vein beyond the end of the first vein, segments of discal cell two to one, the 

 penultimate section of the fourth vein about one sixth the ultimate, shorter 

 than the posterior crossvein and about two fifths the length of the ultimate 

 section of the fifth vein. 



Four males and three females. Powell County, Montana (Wm. M. 

 Mann) ; Moscow Mountain, Idaho; Mount Constitution, Washington. 



Agromyza auriceps nevs^ species. 



(^ 5. Length 2 mm. Black, pollinose, the occiput, thorax and abdomen 

 with grayish tinge, the legs black. Interfrontalia, face, cheeks, labella, halteres 

 and the narrow incisures of the abdomen yellow. Antennae and palpi black. 

 Vibrissal ridge brown ; clypeus black. The narrow frontal orbits black, grad- 

 ually merging into yellow anteriorly ; four f ronto-orbitals ; ocellar bristles 

 reaching half way to the antennae. Thoracic setulae rather fine and long, about 

 four rows of acrostichals ; the dorsocentrals scarcely differentiated from the 

 setulae, except the posterior pair. Notopleural suture very narrowly yellow ; a 

 narrow triangular yellow mark descending on the meso-pteropleural suture ; 

 one posterior sternopleural and one posterior mesopleural bristle. Calypteres 

 dirty yellow and with blackish fringe. The penultimate segment of the male 

 abdomen somewhat shining, the hypopygium small, globular, its parts not pro- 

 jecting; in the male the incisures of the venter also rather narrowly but uni- 

 formly yellow; in the female the incisures of the basal four segments very 

 narrowly of the penultimate segment rather broadly yellow, the ultimate seg- 

 ment shining jet black, compressed, and as long as the preceding three seg- 

 ments together; hairs of the abdomen rather conspicuous, the membrane 

 between the sternites and the tergites yellow. Wings hyaline, veins blackish, 

 rather strong, the second section of the costa two and one half times the third, 

 which is equal to the fourth, the ends of the third and fourth veins diverg- 

 ing; anterior crossvein before the middle of the discal cell, the penultimate 

 section of the fourth vein about one fourth the ultimate and a little longer 

 than the posterior crossvein ; the ultimate section of the fifth vein slightly 

 longer than the penultimate section ; anal vein strong, nearly reaching the 

 wing margin. 



Five males and six females, Moscow Mountain, Idaho ; one female, 

 Colorado (C. F. Baker, collector). 



This species is probably closely related to Agromyza Davisii, re- 

 cently described by Walton, but can scarcely be the same on account 

 of its weak thoracic bristles. 



