FORMOSAN AGROMYZIDAE. 
307 
bristled as in Rhicnoessa, but the dorso-centrals are stronger than is the 
Tuie in that genus. Legs formed as in Rhicnoessa, but both the mid and hind 
tibiæ have well developed bristles on the dorsal surfaces; no preapical 
bristle present. Wing with costal vein reaching only to third vein, the 
setulæ minute, very slightly increasing towards end of first vein; at the 
apex of the first costal division, there is a distinct small bristle, and a very 
indistinct break; anal cell distinct; anal vein subobsolete; outer cross vein 
at before wing middle. Squamæ very small. 
This genus presents, in the bristling of the tibiæ, a character which 
I have not observed in Rhicnoessa or its allies, but the type species is so 
closely allied in other respects with this genus, that I have considered it 
-advisable to associate it with Rhicnoessa in my description. 
Pseudorhicnoessa spinipes n. sp. 
Female: Head yellow; ocellar triangle, black, the surface obscured 
by gray pollen; back of head black, obscured with gray pollen; antennæ 
yellow, third joint brownish; arista brown; face and cheeks with whitish 
reflection. Thorax black-gray, opaque, covered with gray pollinosity ; 
pleuræ with a brownish tinge, opaque. Abdomen slightly shining, black- 
brown, sides of the two basal segments yellowish, and a narrow, whitish 
yellow, hind marginal fascia on each segment, which is slightly interrupted 
on segments 8 to 5. Legs yellow, including the coxæ ; all femora broadly 
browned on apices; tibiæ with apices browned; tarsi with the last two 
joints brownish. Wings clear; costa, first, third, and fifth veins brown, 
second and fourth veins indistinct, the latter especially so on its whole 
length. Squamæ and halteres yellow. Hairs and bristles black. 
Ocellar bristles strong, divergent , widely separated at their bases ; 
surface of frons with scattered short hairs; antennæ of moderate size, 
third joint rounded ; arista thin, short, not longer than width of frons at 
anterior margin; head higher than long; cheek barely one-third as high 
as eye, marginal bristles in a single row, the bristles, increasing in length 
towards anterior angle, upcurved; vibrissa hardly stronger than last mar¬ 
ginal bristle ; proboscis fleshy, stout ; palpi rather small. Mesonotum with 
4 pairs of dorso-centrals; the disc with very numerous short setulæ, of 
which there are 6 rows between the dorso-centrals ; disc of scutellum with 
similar setulæ. Abdomen with numerous surface hairs, those on the pos¬ 
terior and lateral margins of the segments bristle-like. Legs short-haired ; 
mid tibiæ with 2 antero-dorsal bristles, and 8 very high-placed on the 
postero-dorsal surface, giving them the appearance of being almost on the 
dorsal surface; hind tibiæ with 8—4 antero-dorsal'bristles, and 2 on the 
20 * 
