42G Professor Williston on the 



AGROMYZIDJE. 



Platophrtmyia, n. g. 



Allied to Agromyza, but the front very long, plane, and the 

 epistoma projecting, the proboscis long and slender, folding back- 

 ward near the middle. Front long, descending, plane or gently 

 concave longitudinally, with moderately strong bristles reaching 

 nearly to the root of the antennae. Antennae short, third joint 

 large, rounded, arista bare. Face excavated in profile, short, the 

 epistoma projecting as far forward' as the antennal projection ; oral 

 margin of cheeks long, horizontal, straight ; well developed vibrissal 

 bristles present. Oral margin in front notched. Palpi large, pro- 

 jecting, a little thickened at the extremity. Thorax moderately 

 arched in front, flattened behind, with bristles on the sides and in 

 front of the scutellum. Scutellum large, with four bristles. Abdo- 

 men oval, depressed, composed apparently of five visible segments, 

 genitalia not prominent. Legs short and rather strong, not at all 

 bristly. Auxiliary vein rudimentary ; first longitudinal vein 

 short; basal cells small but distinct ; cross-veins approximated, 

 the posterior one situated before the middle of the wing. 



1 . Platophrymyia nigra, n. sp. 



Black. Frontal triangle prominent, with a depression on either 

 side, which extends in the middle in front to the antennae shallowly. 

 Face with a distinct median keel. Palpi black. Thorax lightly 

 greyish-dusted. Scutellum oval, with four bristles, the median 

 pair decussate. Abdomen pruinose. Halteres yellow. Metatarsi 

 yellowish. Wings whitish-hyaline ; penultimate section of the 

 fourth vein about as long as the ultimate section of the fifth vein ; 

 the third vein terminates a very little beyond the apex of the wing, 

 and is curved a little toward the fourth vein towards its extremity. 

 Length 2 mm. 



One specimen. St. Yincent. 



Ophthalmomyia, n. g. 



Auxiliary vein feebly distinct at its beginning, continuing as an 

 indistinct line and then uniting with the first vein. First vein 

 short, extending little more than one-third of the length of the 

 wing, with an incision in the costa before its tip. Cross-veins 

 not approximated, the ultimate section of the fourth vein scarcely 



