Dijptera of St. Vincent (West Indies). 359 



DiDYMA. 



V.d.Wulp,Biologia Central!- Amer., Diptera, ii., 156^ 1890. 

 1. Didyma calyptrata, n. sp. (PI. XL, fig. 95, head of $ .) 



^ . Front above equal to about one-fourth of the width of the 

 head, a little broader below ; silvery grey ou the sides, the median 

 stripe black, narrower above, and narrower than the sides. Sides 

 of the face grey, the median depression darker. The frontal 

 bristles descend as far as the base of the third antennal joint, and 

 nearly as far as the uppermost of the vibrissal bristles. Eyes 

 clothed thickly with dusky pile. Antennte black, shorter than the 

 face, the third joint four or five times longer than the second ; 

 arista thickened at the base. Proboscis black, the palpi yellowish. 

 Thorax black ; mesonotum shining, very thinly pollinose, aud with- 

 out distinct stripes. Scutellum black. Abdomen short-oval ; 

 black, with thinly pollinose bands on the anterior part of the 

 segments ; first and second segment with marginal bristles ; third 

 with a posterior row ; fourth with the posterior part bristly. Legs 

 black ; hind tibi« with unequal bristles. Tegulse large, yellowish- 

 white. Wings greyish-hyaline ; small cross-vein at the middle 

 of the discal cell ; angle of fourth vein broadly rounded ; first 

 posterior cell terminating just before the tip, narrowly open. 

 Length 4 mm. 



Two specimens. The female specimen has the front 

 broader, the eyes sparsely pilose, the mesonotum more 

 distinctly pollinose, and with two narrow black stripes in 

 front ; the abdomen broader, and the marginal bristles 

 of the first and second segments possibly wanting. 

 There is a pair of orbital bristles present in both sexes. 



Dkgeekja. 

 Meigen, Syst. Beschr., vii., 249, 1838. 



1. Degeeria nigriventris, n. sp. (PL XI., fig. 96, head 



of $.) 



$ . Abdomen shining black ; discal bristles present ; wings 

 hyaline. Length 4 mm. 



Front only a little narrower above, equal in width to about one- 

 fourth of that of the head ; median stripe very broad, opaque- 

 black ; sides grey, at the vertex shining black. Face opaque- 

 grey, sides very narrow ; vibrissal row of bristles extending 



