SYRPHIDAE. 



197 



greater than at vertex. Front just before antennal prominence shining black, 

 bare ; remainder of front and vertex shining metalhc bhiish, largely obscured 

 by brownish-black dust ; front and vertex completely covered with rather 

 thick, long, shaggy, black hair, extending to upper occiput ; behind black hair 

 a narrow band of whitish hair of similar length. Upper occiput very prominent, 

 so that corners of eyes are cut away posteriorly ; middle of occiput devoid of 

 long hair, with microscopic whitish pubescence and whitish pollen, and with a 

 few longer white hairs below. First and second joints of antennae shining 

 black, third joint opaque black, rounded, slightly deeper than long. Arista 

 black, bare, much thickened on basal half. Face depressed immediately below 

 antennae, otherwise strongly projecting ; shining black, covered along eye 

 margins, narrowly opposite side of antennae, more widely below to middle of 

 cheeks, with dense white band of microscopic pubescense, connected just below 

 antennae. Shining black middle of face with a few longer black hairs, sides 

 sparsely clothed with long white hairs. 



Dorsum of thorax shining black, narrowly opaque anteriorly, and clothed 

 with thick, long, greyish hair, which becomes black in middle and posteriorly. 

 Scutellum black, shining, clothed with very long, black hair. Pleurae grey, 

 feebly shining, \vith middle covered with dense tufts of long, greyish- white pile. 

 Halteres light yellowish. 



Abdomen shining black, with nearly parallel sides, third and fourth segments 

 being only slightly narrower than second, and with their sides very strongly 

 incurved. Dorsum clothed with rather long, thick hair, becoming shorter 

 posteriorly, whitish on second and third segments anteriorly, forming a black 

 band posteriorly ; fourth tergite with entirely black, appressed, stifiish hair. 

 Genitalia shining black, short, black haired, and barely visible from above. 



Legs slender, shining black (except tarsi, which are dark brown), clothed 

 for most part with black hair ; a few whitish hairs on anterior tibiae posteriorly, 

 and both long, sparse, white hairs and microscopic whitish pubescence on hind 

 femora : first joint of hind tarsi slightly thickened. 



Wings hyaline ; stigma and veins light brown, costa ending a little before 

 tip of wing. 



Upolu : Malololelei, 1 (holotype), 2.vii.l924 (Armstrong), 1 (paratype), 

 18.vi.l924 (Buxton and Hopkins). Tutuila : Pago Pago, 2 <^(^ (paratypes), 

 18.iv.l924 (Bryan), 14.xii.l925. 



