850 Professor Williston on the 



yellow. The female has a broad median black stripe on 

 the face, and the abdomen has obscure blackish markings, 

 in the shape of two slender, approximated, median stripes ; 

 the hind margin of the segments is brownish. 



2. Mesogramma laciniosa. 



Mesogramma laciniosa, Loew, Centur., vi., 50. — Cuba. 



Several female specimens I refer doubtfully to this 

 species. The third and fourth abdominal segments have 

 each two oval, oblique, black spots, and the posterior 

 bands with a geminate, anteriorly dilated, slender pro- 

 longation in the middle, their anterior margin on each 

 side concave; the fifth segment has three anterior, oval, 

 black spots. 



3. Mesogramma hoscii. 



Syrphus hosci, Macquart, Dipt. Exot., ii., 2, pi. xvii., 



fig. 2. 

 Syiyhus gurges, Walker, Dipt. Saund., 236 (Osten 



Sacken) . 



Sah. Carolina, Alabama, Florida. 



Several female specimens that agree with the descrip- 

 tion, save that the second abdominal segment is black, 

 with a median, interi'upted, yellow stripe. Mr. Hunter 

 thinks that this species is identical with M. parvula, 

 Loew, and he may be right. 



4. Mesogramma, sp. 



S t 9 • Face yellow. AntennEe reddish yellow. Frontal tri- 

 angle and the lateral margin of the female front yellow ; vertical 

 triangle black. Mesonotum with an entire yellow, lateral stripe. 

 Scutellum black, with a yellow border. First two abdominal seg- 

 ments black, the first with the anterior angles, the second with a 

 broad median, band yellow ; third and fourth segments each with 

 a quadrangular spot posteriorly on each side, and a small spot on 

 the front margin, together with a median, partly obsolete, geminate 

 stripe. Fifth segment with three spots. Legs yellow ; hind 

 femora with a broad black ring; hind tibiae and tarsi brown; middle 

 femora with a partly obsolete spot on the upper side distally. 

 Length, 7-8 mm. 



Sixteen specimens. The hind femora are a little stouter 

 than usual. 



