226 DIPTERA OF NORTH AMERICA. [PART it 



ties ; the hairs on the front side of the fore coxae are also whitish ; 

 on the outside of the hind coxae there is a solitary black bristle. 

 Tibiae and tarsi elongated and very slender ; middle and hind tarsi 

 strongly infuscated from the tip of the first joint ; the fore tarsi 

 from the tip of the first joint become likewise more dark, though 

 their color changes much more gradually into brown. Cilia of the 

 tegulae whitish. Wings hyaline with a slight gray -yellowish tinge ; 

 the end of the fourth longitudinal vein approaches rather strongly 

 the end of the third. 



Hab. Florida, District of Columbia. (Osten-Sacken.) 



2. S. rilfoellllS Loew. 9 . — Pallide flavus, thoracis macula postica, 

 abdominis fasciis setisque coxarum nigris. 



Pale-yellow ; thorax with a black spot upon the posterior side ; abdomen 

 with black bands ; coxae with black bristles. Long. corp. 0.25. Long, 

 al. 0.23. 



Syn. Saucropus rubellus Loew, Neue Beitr. VIII, 76, 2. 



Pale-yellowish. Face narrow, white. Antennas bright-yellow. 

 Front black with white-yellowish dust. The frontal bristles and 

 the two stronger bristles behind the upper corners of the eyes, 

 black. Cilia of the orbit yellowish-white. Upper side of the 

 thorax reddish-yellow, the sloping area on its hind margin black. 

 Scutellum yellowish with two strong black bristles ; on the outside 

 of each there is a very minute delicate hair, easily overlooked. 

 Metathorax brown only on the upper margin and upon the mid- 

 dle line. Pleurae with a black dot above the middle coxae. Ab- 

 domen with four black transverse bands of uniform breadth, of 

 which the first near the anterior margin of the second segment, 

 the others on the anterior margins of the following segments ; the 

 last of these bands is sometimes indistinct. Coxae and. feet pale- 

 yellowish. The bristles on the fore coxae black ; the hair on the 

 front side blackish, towards the basis of the coxae pale ; middle 

 coxae with black bristles and hairs ; the hind coxae on their out- 

 side with a single black bristle. Tibiae and tarsi elongated, very 

 slender ; the tarsi from the tip of the first joint infuscated. The 

 cilia of the tegulae yellowish. Wings with a very distinct gray- 

 yellow tinge ; the end of the fourth longitudinal vein rather strongly 

 approaches the end of the third one. 



Hab. Virginia. (Osten-Sacken.) 



