N0.1198. DIPTEBA FROM PUERTO RICO— COQUILLETT. 261 



DISCOCERINA PARVA Loew. 



Six specimens, taken at Agaadilla in January and Arroyo and Vie- 

 ques Island in February. This species was originally described from 

 the District of Columbia, and the U. S. National Museum contains a 

 specimen captured at Lake Worth, Florida, by Mrs. A. T. Slosson. 



DISCOCERINA LEUCOPROCTA Loew. 



Eleven specimens, from Utuado, Mayaguez, and Aguadilla in Janu- 

 ary and Arroyo, Fajardo, and Vieques Island in February. It was 

 originally described from Maryland. 



HYDRELLIA GILVIPES, new species. 



Male: Black, the greater part of the antennae, median vitta on the 

 face, the cheeks, palpi, and legs, including the front tarsi, yellow, knob 

 of the halteres whitish; front opaque, dark gray pruinose, the lower 

 corners brown; face and cheeks yellowish-gray iDruinose; a row of 

 about seven short bristles extending from the lower part of the face to 

 the occiput, crossing the cheek near the eye; third joint of antennae 

 oval, only slightly longer than broad; thorax and scutellum opaque, 

 grayish-brown pruinose, that on the pleura light gray ; two pairs of 

 dorso-central macrochsetse, no bristly hairs between them; abdomen 

 polished, the center of the second segment and posterior margin of the 

 third yellowish gray pruinose ; fourth segment longer than any of the 

 others, about one and one- third times as long as the fifth ; wings yel- 

 lowish hyaline, the apex of the second vein nearly midway between 

 the apices of the first and third veins. Length, 1.2 mm. A single 

 specimen, collected at Bayamon in January. 



Type.—G3it. No. 4378, TJ.S.N.M. 



PTILOMYIA, nevvT genus. 



Second joint of antennne bearing a short, forwardly directed macro- 

 chseta at its anterior upper angle, the third joint shorter than broad, 

 rounded at the apex, arista bearing about six long bristles on the upper 

 side and with about three shorter ones on the lower side; front slightly 

 contracted at the lower end, two pairs of vertical bristles and two 

 fronto-orbitals, the upper pair of the latter directed backward, the lower 

 one forward, ocellar bristles located higher than the lowest ocellus; no 

 postvertical bristles, front destitute of bristles other than those above 

 mentioned; head in profile forming nearly an equilateral, acute-angled 

 triangle, face convex, not retreating at the oral margin, bearing a 

 transverse row of about six macrochaitse a short distance above the 

 oral margin and with two on each side of the face near the middle; 

 cheeks about one-tenth as wide as the eyeheight, each bearing a stout 

 macrocheeta near its center, clypeus hidden, mouth opening very large, 

 proboscis excessively large, enlarging outwardly, palpi slender and 

 nearly linear ; eyes bare ; auxiliary vein obsolete apically, second basal 



