212 LIST OP DIPTEEA. 



Rhagio intermedius, n. s., mas. et fern. Fulvus, thorace fusco tri- 

 vittato, pectore flavo-albido, abdomine fusco quadrimaculato 

 apice obscuriore, pedibus fulvis, alis subfulvis. 



Allied to R. tringarius and to R. immaculatus. Body tawny : 

 head paler beneath, clothed with tawny hairs : eyes brassy : palpi, 

 lancets and sucker tawny, the former clothed with black hairs: 

 feelers pale ferruginous ; the bristle or fourth joint piceous : chest 

 tawny, thinly clothed with black hairs, and having three broad 

 brownish stripes, which cease before they reach the scutcheon ; mid- 

 dle stripe very slightly divided ; breast whitish yellow : abdomen 

 tawny and clothed with black hairs ; each of the segments from the 

 first to the fourth with a brown spot on its back ; following segments 

 more dull : legs tawny, clothed with tawny down : feet dull ferru- 

 ginous : wings with a slight tawny tinge, especially at the base and 

 along the fore border ; veins tawny ; poisers pale tawny. Length of 

 the body 4 — 5 lines ; of the wings 9 — 10 lines. 



Var. /3. Stripes on the chest very indistinct : abdomen without 

 spots. 



Male like the female : breast grayish : abdomen darker towards 

 the tip. 



a. St. Martin's Falls, Albany River, Hudson's Bay. Presented by 

 G. Barnston, Esq. 



Rhagio albicornis. Leptis albicornis, Say, Journ. Acad. Philad. 

 1822, 38, 9. Amer. Ent. t. 13. Wied. Auss. Zweif. i. 223, 4. 

 a. Georgia. From Mr. Abbot's collection. 



Rhagio mystacea. Leptis mystacea ? Macq. Dipt. Exot. ii. 1, 30, 

 1, pi. 3, bis. f. 2. Mas. — Niger, capite subtus, pectore et meta- 

 thorace cinereis, thoracis lateribus scutelloqne ferrugineis, abdo- 

 mine rufo-fusco fulvo fasciato et maculato, basi fulvo, antennis 

 fulvis ,basi piceis apice nigris, pedibus rufo-fuscis, tibiis quatuor 

 anticis flavo-albis, alis subcinereis fusco nebulosis. Fern. — 

 Capite fulvo, thorace fusco, cano quinquevittato. 



Male. — Head black, hoary behind and beneath, and thickly 

 clothed with white hairs : eyes dark reddish i eyelets tawny : feelers 

 tawny; first joint piceous/ fourth black: palpi dull tawny, thickly 

 clothed with long white hairs : sucker piceous : chest black ; its 

 sides and the scutcheon ferruginous ; breast and hind chest gray : 

 abdomen reddish brown, clothed with yellow hairs, which are longer 

 and thicker towards the base; along the hind border of each segment 

 there is a tawny line, which on the disk is dilated into a slightly bi- 

 furcate spot of a paler hue : abdomen beneath piceous, tawny to- 

 wards the base : legs reddish brown ; knees and fore shanks, except 



