354 DIPTERA. 
8. Hydrophoria flavipalpis, sp.n., 3 ¢. 
Thorax whitish, black in the middle; abdomen yellow, with brown dorsal spots; antenne black; palpi and 
legs rufous, the tips of middle and hind femora and the tarsi black. 
Length 5-7 millim. 
Closely allied to the preceding species (H. collaris), differing principally in having the antenne wholly black. 
The scutellum is unicolorous blackish-brown; the markings on the abdomen are sometimes reduced to a 
row of blackish spots, forming an interrupted dorsal stripe. 
Hab. Mexico, Venta de Zopilote 2800 feet, Chilpancingo 4600 feet, Amula 6000 feet, 
and Sierra de las Aguas Escondidas 7000 feet, all in Guerrero (H. H. Smith). 
Seven male and two female specimens. 
4, Hydrophoria transversalis, sp.n., ¢ 9. (Tab. VIII. fig. 12, ¢.) 
Grey ; thoracic stripes, scutellum, a dorsal stripe and transverse bands on the abdomen, antenne, palpi, and 
legs black, the middle and hind femora (in the female all the femora), except at the tip, rufous. 
Length 6 millim. 
Front of the male black, triangular, the eyes being contiguous ; in the female the front is as broad as the eyes, 
with a black frontal band and laterally whitish (sometimes the frontal band is slightly rufous); face and 
cheeks greyish-white, the face perpendicular; inferior part of the cheeks narrow, with.a row of bristles ; 
vibrissee at the oral margin, which is not prominent. Antenne black or blackish-brown, inserted on the 
median line of the eyes; second joint with a bristle; third joint twice as long as the second; arista 
moderately plumose. Proboscis and palpi black. Thorax grey, the shoulders whitish ; on the prothorax 
are two broad, more or less distinct black stripes, which behind the transverse suture are confounded in 
the more general blackish colour of the thoracic dorsum ; scutellum brownish-black. Abdomen of the 
male conical, grey, with a black dorsal stripe, which is triangularly enlarged on the first segment, and 
extended to a front border on the second and following segments: it is clothed with many bristly hairs ; 
long macrochete present laterally on all the segments and on the hind borders of the third and anal 
segments. In the female the abdomen is more ovate, pointed towards the tip, for the rest similar in 
coloration and markings to that of the male, but less hairy. Legs slender, black; middle and hind 
femora rufous to near the apex; in the female the front femora are ulso rufous in their basal half; tibia 
with scattered bristles ; foot-claws, and especially the pulvilli, elongate in the male, the pulvilli yellowish- - 
white. Tegule and halteres yellowish. Wings greyish-hyaline; small cross-vein under the end of the 
first vein and a little beyond the middle of the discal cell; third and fourth veins parallel; terminal 
section of the fourth vein longer than the penultimate section (3:2); posterior cross-vein straight or 
slightly concave. 
Hab. Mexico, Xucumanatlan, Omilteme, and Sierra de las Aguas Escondidas, all in 
Guerrero 7000 to 9500 feet (H. H. Smith). 
Several specimens of both sexes. 
POGONOMYIA. 
Pogonomyia, Rondani, Dipt. Ital. Prodr. vi. p. 32 (1877). 
Rondani has characterized this genus as follows :—Eyes bare, subcontiguous in the 
male; front porrect; oral margin densely haired at the sides; antenne short, the 
second joint bristly; arista nearly bare. Hind femora with a row of bristles beneath ; 
middle tibie with bristles on the outer and hinder sides. Lower scale of the tegule 
