1913] Agromyza and Cerodontha. 293 



posterior margin, at posterior margin less than one-third the eye height, 

 bristles on margin rather weak, vibrissa well differentiated; proboscis 

 and, palpi yellow. Mesonotum glossy black, humeri brownish; two 

 pairs of dorso-central bristles present; disk with numerous short setulse; 

 pleurae glossy black, brownish below wing base, squamae grayish, mar- 

 gin and fringe brown; scutellimi and postnotum concolorous with disk 

 of mesonotum. Abdomen glossy black; base of ovipositor distinctly 

 longer than preceding abdominal segment; posterior marginal bristles 

 on last abdominal segment strong. Legs brown, apices of femora 

 and bases of tibiae paler, yellowish, mid tibia without distinctly 

 differentiated posterior bristles. Wings clear, broad; first costal 

 division almost one-half as long as second; inner cross vein beyond 

 end of first vein, outer cross vein at below middle of wing, taking its 

 upper end as below middle of costa, and at less than its own length from 

 inner cross ^'ein; second section of fourth vein less than one-half as 

 long as first, first and second sections of this vein together half as long 

 as last section; veins 2-3-4 divergent, fourth vein at below apex of 

 wing; last two sections of fifth vein subequal. Halteres pale yellow. 

 Length, 2 mm. 



Redescribed from type. (Cat. No. 6658, U. S. N. M.). 



Locality: Washington, District of Columbia, (collection 

 Coquillett). A male in C. W. Johnson's collection from 

 Pottstown, Pennsylvania, differs from the type in having the 

 frons and antennae paler lemon yellow, the arista slightly 

 longer, and the cheeks distinctly over one-third the height of 

 eye. In other respects similar to the female. 



Food-plant unknown. 



20. Agromyza platyptera Thomson. 



Syn: Agromyza platyptera Thomson, Eugene Resa, ISel^lSaS, p. 60S. 



Agromyza coronata Loew, Dipt. Amer. Sept. Indig., Cent. 8, 1869, p. 162. 

 Agromyza jiicunda v. d. Wulp., Tijdschr. v. Entom. Vol. X, 1866, p. 161. 

 Oscinis malvcB Burgess, Dept. Agric. Rept. 1879, p. 202. 

 Agromyza lateralis Williston, Trans. Ent. Soc. Lond. 1896, p. 428. 



Male and Female: Frons opaque, lemon yellow; orbits sometimes 

 posteriorly blackened, four pairs of orbital bristles anterior to front 

 ocellus; frons generally over one and one-half times as long as broad, 

 and one-third of the head with; ocellar region and back of head black; 

 face slightly concave in profile, yellow, slightly keeled in center; cheeks 

 yellow, rather short, higher posteriorly than anteriorly, at highest part 

 short of one-third the height of eye; eye higher than long; bristles on 

 mouth margin moderately strong, numerous, upper ones upturned, 

 vibrissa stronger than other bristles; proboscis yellow; palpi black, 

 normal in shape; antennas black; dorsal bristle on second joint weak, 

 third joint short, regularly rounded, higher than long, arista brown- 

 black, swollen at base, very shortly pubescent; not as long as from its 

 base to vertex. Mesonotum shining black; lateral margins, including 

 humeri, broadly pale yellow; two pairs of dorso-centrals present, some- 



^TS 



