Onesia. 153 



bristles small. Occipiit all black-haired or {sepulchraUs) pale-haired 

 with black hairs behind postocular bristles. Frontal bristles reaching 

 to lunula, in male being small upwards and stopping before vertex, 

 in female strong and the iippermost directed outwards. Cheeks 

 hairy, either in almost the whole length or only in upper half. Vi- 

 brissal ridges a little converging just below, vibrissæ ascending to 

 middle or a little above. Eyes with the facets equal or in some species 

 a little enlarged in male towards inner margin above {caerulea, 

 gentilis). Epistoma not retreating, somewhat reflected and prominent 

 below or only slightly so. Oral cone and proboscis of medium length 

 or a little above; clypeus forceps-shaped. Palpi thread-like. Antennse 

 inserted at or a little below middle of the eye; third joint from about 

 one and a half times to nearly thrice as long as second; arista medium 

 long-plumose in about basal half or long-plumose, but less densely,, 

 in about basal two thirds. Thorax slightly longer than broad; three 

 postsutural dorsocentrals and two præ- and three postsutural acrosti- 

 chals; two or three postsutural and no or one præsutural intraalar 

 bristle. Scutellum with three or four marginal bristles on each side^ 

 the basal being small or wanting; one or two pairs of discai bristles. 

 Three sternopleural bristles in position 2 — 1, but the lower not rarely 

 wanting. Pteropleura hairy with a tuft above. Propleura hairy. 

 Abdomen conical or a little ovate; excavation on second segment 

 reaching the margin or stopping a little before. Only marginal bristles 

 present; third segment with stronger marginal hairs, sometimes with 

 bristles, fourth segment with a row of bristles and fifth segment 

 quite or almost quite covered with bristles. Fifth sternite in male 

 triangularly excised to the middle. Genitalia larger or smaller; upper 

 forceps cleft to middle or only at apex; arms of lower forceps of 

 various shape, as long or about as long as upper forceps. Legs with 

 the bristles not specially strong; middle tibiæ with a ventral bristle 

 except in male of sepulchraUs. Claws and pulvilli in male strongly or 

 moderately elongated, and in the latter case not much stronger than 

 in female. Wings with first posterior cell open, sometimes narrowly 

 or just closed or even short petiolate, ending near apex of wing; 

 discai angle rectangular or a little obtuse; apical cross-vein concave 

 or more straight; cubital vein with bristles only at base. No or a 

 small costal spine. Lower squamula bare {Melinda) or hairy on 

 upper surface {Onesia s. str.). 



The species of Onesia s. str. are recorded to be viviparous, but 

 those of Melinda oviparous; the larvæ generally seem to live in 



