SYNOPSIS OF NORTH AMERICAN SYRPHID^. 61 



anmilatis, anticis, latis, testaceis, utrinque nigro marginatis, tarsis anticiSj 

 latis, testaceis, basi nigro pariter marginatis, pedihiis poHticis nigris ; alis 

 pallide cinereis, macula stlgmatlcali pall ide fused. 



Noir. Anteuues, 3'' segnieiit avec uue macule fauve en dessous ; face 

 assez luisaute, a reflets gris ; bords des orbites posterienrs a duvet 

 blanc ; thorax, ecussou, luiaauts, d'un bronze obscur avec de longs 

 poils clairsemes bruuatres, flancs a duvet blancbatre; culllerous et 

 balauciers grisatres, raassue noire; abdomen d'un noir opaque avec de 

 longs poils clairsemes blanchatres vers la base, ler et dernier segments 

 luisants, 2®, 3^ et 4** avec, de cbaque cote, une macule trigonale grise ; 

 cuisses anterieures te .stacees avec no large anneau noir, et, en dessous, 

 de longs cils noirs, tibias testaces, elargis, bord6s de noir, tarses et 

 metatarses auterieurs, fort elargis, testaces, les derniers bordes de noir, 

 pieds intermediaires avec les cuisses presque totalement noires, des poils 

 clairsemes blanchatres aux tibias, uu large anneau, tarses a l-extr^mite, 

 noirs, pieds posterienrs entierement noirs, avec les cuisses munies de 

 I)oils blancs clairsemes ; ailes un pen giisatres, stigmate d'un jaunatre 

 obscur. Abdomen etroit. Californie. — 1 specim. 



The legs of Bigot's specimen are more black, and the abdominal spots 

 perhaps lighter colored; otherwise it seems to be similar. 



Platychirus Naso Walker, List, etc., iii, 587 {Si/r2)hu8).—lluds. B. Terr. 

 Platychirus Paciliis Walker, Dipt. Saunders, '240 (Syrjyhus). 



"These are both Platychiri ; whether they differ from P. peltatus 

 and qnadratiis, I am unable to tell, as I had no specimens for compari- 

 son when I saw the types in the British museum."— Osten Sacken, Cat. 

 Dipt., p. 244, note 201. These species can hardly be determined from 

 Walker's descriptions, and it does not seem worth while to reproduce 

 them. 



LEUCOZOl^A. 



Leucozona Schiuer, Wieu. Ent. Mouatsclir., vi, 214, 1860. 

 Rather large, thickly pilose species ; black, with a broad yellow band 

 at the base of the abdomen. Head hemisperical, somewhat broader 

 than the thorax. Antennae porrect, short, third joint oval ; arista basal, 

 bare. Face in both sexes broad, yellow, with black cheeks and median 

 stripe; grayish pollinose, pilose; in profile perpendicular, somewhat 

 protuberant below, produced considerably downwards below the eyes, 

 tuberculate. Eyes pilose, contiguous in the male. Thorax scarcely 

 longer than broad. Scutellum reddish yellow, translucent. Abdomen 

 elliptical, depressed, broadest beyond the middle, not more than twice 

 as long as the thorax. Wings with open marginal cell, third longitudi- 

 nal vein very gently curved, small cross-veii| near base of discal cell, 

 first posterior cell closed some distance before the costa. T^-pe of genus, 

 L. lucoriim (Linne). 



