182 DIPTERA OP NORTH AMERICA. [PART III. 



which runs from the anterior to the posterior margin, but is very 

 much diluted beyond the fourth longitudinal vein. The second 

 longitudinal vein is gently curved forward and ends some distance 

 from the tip; the small crossvein is before the middle of the discal 

 cell ; the last section of the fourth longitudinal vein is almost 

 parallel to the third vein ; the posterior angle of the anal cell is 

 rounded. 



Hob. Cuba (Gundlach). 



Observation. — Through the kindness of Dr. Gundlach, who 

 sent me the specimens, I have been informed of the identity of 

 this species with the one described by Bigot. I have not suc- 

 ceeded yet in comparing De la Sagra's work, which contains the 

 description, and I draw the attention of those, to whom this 

 work is accessible, to the fact, that among the Cuban species 

 described by me, one or the other may have been previously 

 described by Mr. Bigot in that volume. 



Gen. V. SY1VTACES nov. gen. 



Charact. — Front moderately broad, broader above (according to Macquart's 



statement, his figure, on the contrary, shows a front narrower 



above). 

 Antenna! arista pubescent. 



Feet slender ; all the femora thin and all armed. 

 Wings: posterior angle of the anal cell rectangular; crossveins not 



approximated ; the last section of the fourth lougitudinal vein only 



moderately convergent with the third. 



The typical species is Setellia apicalis from Brazil, described 

 by Macquart (Dipt. Exot. II, 3, p. 249). As I have not seen 

 this species, I have borrowed the generic characters from that 

 author's description and figure, which gives these characters a 

 somewhat uncertain basis. The close relationship to the next 

 following genus is, in my opinion, evident ; still, it does not 

 seem advisable to unite them, as, in the present genus, the front 

 femora are weaker and armed with less conspicuous spines ; as 

 the hind feet are much less elongated in comparison to the front 

 feet ; as the posterior angle of the anal cell is not obtuse, but 

 rectangular, and as the second longitudinal vein has no stump 

 of a vein upon it ; nevertheless it is not impossible that the 

 examination of a specimen would lead to a different conclusion 

 from that which seems warranted by Macquart's description. 



