50 FAUNA HAWAIIENSIS 



on the mesopleurae, scutellum shining black, with two large subapical and two small 

 lateral bristles, halteres light yellow ; dorsum of thorax with three pairs of dorso-central 

 bristles. Abdomen shining blackish. Legs entirely black. Wings brownish-grey, with 

 five pellucid spots, the largest in the submarginal cell and subquadrate, two in the first 

 posterior cell nearly as large, and one on each side of the posterior transverse vein, that 

 on the inner side being much smaller than the others, subrotund and touching the filth 

 longitudinal but not reaching the fourth ; the three upper spots stretch entirely across 

 the cells in which they are contained ; costal vein reaching the tip of the fourth vein. 



Hab. Oahu. Eieht males and six females were obtained on wet rocks in the 

 Kaala Mts., at a height of 2000 ft., in March 1893. 



This species appears to be closely allied to S. stagnalis Fin., but is distinguished 

 from the latter by possessing three bristles on the face. It can, moreover, be dis- 

 tinguished from most of the species (but not all) with spotted wings by possessing 

 three pairs of dorso-central bristles on the thorax, a character which belongs rather 

 to the group possessing clear wings. 



Plate 1 1 1, fisf- I. wine- 



to" 



Fam. DROSOPHILIDAE. 



Idiomyia, gen. nov. 



Front slightly convex, with three fronto-orbital bristles, the anterior about mid- 

 way between the insertion of the antennae and the vertex and pointing forward, the 

 other two pointing backward, orbital stripes abruptly terminated about or a little beyond 

 the middle of the front, to which the vertical triangle nearly reaches ; face slightly 

 excavated, the oral margin distinctly reflexed, a few small bristles at the vibrissal angle, 

 proboscis very thick, palpi thick and clavate, eyes large, round or slightly oval and 

 distinctly pubescent. Antennae short, the first joint hardly distinguishable, the second 

 large with a convex upper surface, so that between it and the third there is a distinct 

 indentation, third joint large, oval and rounded at the extremity, arista bipectinate, 

 sometimes also with short pubescence, bare at the base beneath. Thorax with two 

 pairs of widely-separated macrochaetae behind the middle, scutellum subtriangular, 

 rather flat, with a pair of lateral bristles and a pair of decussating apical ones. 

 Abdomen slender and narrower than the thorax, subconical and obtuse in the male, 

 pointed in the female ; the latter sex possesses a more or less upturned ovipositor and a 

 peculiar supra-anal process furnished with long stiff hairs. Legs long and slender, with 

 few or no bristles. Wings much longer than the abdomen, auxiliary vein rudimentary, 

 first longitudinal vein not quite reaching a third of the length of the wing, second and 

 third longitudinal veins more or less curving upward in their basal half and then 

 running parallel or nearly so to their termination, the third ending at the tip of the wing, 



