NO. 1198. DIPTEUA FROM PUERTO RICO—COQUILLETT. 263 



browD, opaque, densely whitish pruinose; pleura, halteres, legs, and 

 abdomen yellow, the latter in the female brownish at each end, in the 

 male brown on the third and fourth segments; wings hyaline. Length, 

 1 mm. Two specimens, collected at Bayamon and TJtuado in January. 

 Type.— Gat. No. 4380, U.S.N.M. 



CLADOCH^ETA, new genus. 



Antenntie projecting obliquely forward and downward, nearly perpen- 

 dicular, almost as long as the face, the second joint bearing a nearly 

 erect macrochtcta at the middle of the upper side and with a smaller, 

 forwardly directed one at the anterior upper angle; third joint scarcely 

 longer than the second, as wide as long, the arista inserted near its 

 base, bare, near the base of the upper side bearing a single bristle 

 which is almost half as long as the arista proper; front bearing two 

 pairs of vertical bristles, one pair of postvertical and one of ocellar, 

 two pairs of orbital bristles, placed one behind the other, the lower 

 pair only slightly below the middle of the front and directed forward, 

 the other pair directed outward and backward, a very small back- 

 wardly directed one between the lower one and the eye ; on each side of 

 the middle of the lower half of the front are four or five pairs of short 

 bristles directed inward; head at lower part longer than at insertion of 

 antennae; face in profile strongly concave, vibrissas well developed; 

 eyes nearly bare, slightly higher than long; cheeks about one-ninth 

 as wide as height of eye, proboscis short, very robust, palpi clavate; 

 legs rather short and slender, nearly bare, each tibia bearing an erect 

 preapical bristle on the outer side, front femora bearing a row of bristles 

 on the upper and under sides; auxiliary vein becoming obsolete bejond 

 its middle, first vein scarcely reaching beyond the first fifth of the 

 length of the wing, apex of second vein over twice as far from the apex 

 of the first vein as from the tip of the third, the latter at the extreme 

 wing-tip, fourth vein outwardly diverging from the third, hind cross- 

 vein slightly more than its own length from the apex of the fifth vein, 

 small crossvein slightly before the middle of the discal cell and far 

 beyond the apex of the first vein, penultimate section of the fourth vein 

 only slightly more than half as long as the last section, second basal 

 cell united with the discal, anal cell present, the sixth vein not pro- 

 longed beyond the apex of the latter. Type, the following si^ecies : 



CLADOCHAETA NEBULOSA, new species. 



Male and female : Head opaque, yellow, the front, except the orbits, 

 brownish yellow, ocellar dot brown, eyes brownish red, antenn* brown, 

 the first two joints yellow, palpi and proboscis yellow; thorax dark 

 yellow, subopaque, thinly gray pruinose, two pairs of dorsocentral 

 macrochsetfe, the bristly bairs between them numerous and not dis- 

 tinctly arranged in rows; three pairs of supra-alar bristles, one pr.esu- 

 tural, two posthumeral, one humeral, and two sternoplural; scutellum 

 dark yellow, the margin lighter, bare except for the four marginal 



