108 [May, 



width, witli pale hairs ; frons shining black, with a narrow margin of pale 

 tomentiuu against the eyes, and a fringe of golden hairs springing out of the to- 

 nientose portion ; vertex with a few golden hairs. Eyes bare. Antennae large, 

 wide, and rounded in front with no angulation at all ; entirely fulvous, with a 

 quite bare shining fulvous arista. Thorax dark olive-green, finely but closely 

 punctate and shining, the puncturation coarsening posteriorly ; entirely clothed 

 with an even short but dense and conspicuous golden piibescence ; scutellum 

 like the thorax, but very coarsely punctate with a marginal fringe of x-ather 

 longer pale hairs, but no bristles. Abdomen rather narrow, not widening much 

 in the middle, nearly black ; first segment covered with a bluish-grey tonien- 

 tum, the others shining, finely but very closely punctate ; second segment 

 clotlied with golden pubescence on the front margin and broadly at the sides, 

 in svich a manner as to leave a large semicircular discal patch on the hind 

 margin free from the golden pubescence, but clothed with very short incon- 

 spicuous black haix's ; the third segmexxt is alixxost entirely clothed with the 

 short incoixspicuous black pxibescence, the loxxger goldexx pxibescence being 

 coixfined naxTOwly to the sides ; the fourth segment bears longer pubescence 

 tlxroughovit, but while goldeix behind it tends to become darker towards the 

 froixt margin. Under-side entirely covex-ed with whitish toxxxexxtxuxi. Legs 

 with black fenxora, ixarrowly yellow at each exxd ; with yellow trochaixters and 

 dark coxaj. Femox*a with a doxxble row of fiixe black setae on the apical ixxner 

 portioix, in all thx'ee pairs ; those on the hind pair beiixg nxore nxunerous, and 

 exteixded over the greater part of the length ; those on the froxxt pair being 

 inconspicxxoxxs. Tibiae broadly yellow at both ends, in all three pairs. Tax-si 

 clear yellow, excepting that the last two joints on the two hind pairs of legs ; 

 aixd the froixt tarsi above ax-e darkened ; all the pubescence on the legs pale. 

 Wings with the cubital (3rd longitxxdinal) and ixxarginal cross veins meeting 

 on the costa itself, forixxing axx acxxte angle, and thus leavixxg xxo stalk to the 1st 

 posterior cell ; the subcostal (1st longitxxdinal) vein ends abrxxptly in the costa 

 with an ixpward curve ; the 3rd section of the costa, that is the section between 

 the tei'minatioixs of the mediastinal (axxxiliaiy) aixd sxxbcostal (1st longitxxdiixal) 

 veins, vexy loixg, fvxlly 3^ tixixes as long as the very shox-t 4tlx section ; all the 

 veins clear bright yellow in the basal half of wings, theix a conspicxxoxxs dark 

 patch extends half way across the wing, coxixxxxencing at the apical portion of 

 the mediastinal (axxxiliary) vein, occxxpying the base of the sxxbmargiixal cell 

 and suxToxinding the lower cross vein, bixt not the discal cross vein, which is 

 independently darkened ; beyond this the veins rexxxain dark, excepting for a 

 conspicxxoxxs clear yellow patch oix the front xxxargiix, traceable half way across 

 the wiixg, but chiefly coxxspicxxous ixx the stigixxa and iix the poi-tioxxs of the 

 costal and sxxbcostal veins adjoining ; the apical portion of the wings faixxtly 

 cloxxded. Alxxlae whitish, with golden fx-inge ; halteres white. 



Length, aboxxt 11 mm., expanse, aboxxt 21 mnx. 



The species ruus dowoi to cwrulescens, Mg., in the table of males 

 in Becker's Mouograph, and specimens of that species were taken at 

 the same time and place. It is, however, ahiindantly distinct ; the 

 smaller size, bhiish-black colour, and hoai'y pubescence of cceru- 



