16 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



I have seen the species from Java, submitted by Doctor de Meijeie. 



Hendel does not include this genus in his key, in which it runs to 

 Sciasmornyia Hendel, though evidently distinct from it, the latter 

 having two pairs of equally long backwardly bent orbitals and a pair 

 of strong ocellars, in addition to other differentiating characters. 

 The African species Lauxania subTnetallica Loew belongs to 

 Xangelina. 



PLEURIGONA, new genus 



Generic characters. — This genus will run down in Hendel's key to 

 genera to Ichthyomyia de Meijere, but it is readily distinguished 

 therefrom by the small conical projection of the propleura directly 

 over the fore coxa, the lack of a propleural bristle, the much less 

 prominent face, biemarginate vertical margin, lack of ocellar bristles, 

 and the pronounced downward curvature of the apical section of the 

 fourth wing vein. This last character distinguishes it also from any 

 other genus of the family known to me at this time. 



Genotype. — ^The following species. 



PLEURIGONA CURVINERVIS, new species 



Male. — Shining testaceous yellow, the type specimen greasy but 

 with evidences of two dark submedian lines on anterior half of meso- 

 notum. Wings quite noticeably yellow, veins brown, apices of first, 

 second, and tliird, darker, but without a surrounding cloud. 



Frons about 1.5 as wide as long in center, the vertex sharp and 

 with a shallow emargination on each side of the ocellar triangle, 

 posterior ocelli on edge of vertex, the four vertical and two post- 

 vertical bristles quite well developed, ocellars lacking, both pairs 

 of orbitals very weak and short, upper pair at almost their own 

 length from eyes, the shorter anterior pair even farther from eyes; 

 orbits not differentiated; surface of frons bare; face broad and 

 evenly convex, shining, about 1.75 as high as frons ; cheek about two- 

 thirds as high as eye, the hairs fine and rather long; basal antennal 

 segment very short, third about twice as long as wide; arista with 

 sparse hairs, the longest about as long as width of third antennal 

 segment; palpi slender. Thorax seen from the side pronouncedly 

 arched, with 1 or 2 + 3 or 4 pairs of dorsocentrals and 2 + 4 pairs of 

 acrostichals; the presutural, notopleural, and humeral bristles, quite 

 fine, no sternopleural visible in type; scutellum pronouncedly convex, 

 with four fine bristles. Abdomen short, the hypopygium small. Fore 

 femur without an anteroventral comb; fore and hind tibiae with the 

 preapical dorsal bristle quite long and fine, the mid tibia with that 

 bristle short and strong. Inner cross vein at middle of discal cell; 

 outer cross vein close to middle of wing; marginal cell rather wide 

 and uniform, the second vein roundly curved forward at apex; third 



