Mr. J. E. Collin’s Description of Cecidomyidae. 505 
This genus is easily distinguished by the structure of the 
mouth-parts. Ifthe presence of an auxiliary vein has not 
been overlooked in other genera of the Cecidomyiariae, it 
belongs to a group containing only a few genera, of which 
Tetradiplosis Kieft. from Argentina (known in the female 
sex only) also has bifid ungues, rudimentary empodium 
and non-extensile ovipositor. 
F. rostrata, sp.n. Plates XIV, figs. 1-10; XVI, fig. 1. 
6. Eyes large occupying greater part of head. Frons and face 
short, brownish, the latter with a few short yellowish hairs on the 
lower part. Occiput rather puffed out, brownish-black with a fringe 
of very long curved black hairs, similar hairs being present on the 
lower part of head beneath the neck. A small ocellar tubercle 
bearing a pair of very long curved bristles. Antennae about half 
as long again as head and thorax together. First flagellar joint only 
constricted about the middle, second joint with a very short neck 
separating the two nodes, subsequent joints with this neck and the 
terminal pedicel gradually becoming slightly longer, but even on 
the penultimate joint they are hardly as long as the node from which 
they respectively arise; last node with a cylindrical pubescent 
terminal process devoid of bristles or pores and only a little more 
than one-third the length of the node; the basal node of each joint 
appears to bear only a single whorl of bristles, but the apical node 
in addition to a subapical whorl, bears numerous finer more strongly 
curved bristly hairs. Mouth-parts remarkably developed, the 
two valves of the paraglossae being produced into a huge yellow beak ; 
each valve is thin, chitinous, semi-transparent and clothed on the 
convex, outer (lateral) side with yellowish hairs which become longer 
on the hinder edge towards the pointed tip. Inside the chamber 
formed by these two valves are found the much shorter labrum 
and hypopharynx, the latter with a long slender “ tongue ’’-like 
organ reaching to the tip of the paraglossae. This “tongue” is 
hair-like and microscopically pubescent at the tip. Palpi yellow, 
four-jointed, very long and equally slender, second joint the shortest, 
the almost equally long first and fourth joints being slightly longer 
than the third. Head connected to thorax by a long slender 
membranous neck. 
Thorax yellowish, slightly brownish on disc, with two rows of 
black bristly hairs (some of them very long) gradually converging 
to form a large V, starting behind each humerus and ending in front 
of scutellum; other bristly hairs are present above notopleural 
depression, on postalar calli, and in the form of two rather ill-defined 
