32 PHILIPPINE DIPTERA, II 



cealed behind the straight edge of mouth ; praelabrum not visible ; 

 proboscis proportionally small ; palpi dilated at end. Chsetotaxy 

 of head reduced to a single pair of vertical bristles, placed out- 

 ward, near the eyes. 



Thorax short, subquadrate, slightly convex; suture slightly 

 caudad of middle, broadly interrupted ; humeral calli prominent ; 

 pleurae regularly convex. Thoracic chsetotaxy not well distin- 

 guishable in the type, only the anterior supra-alar being distinct, 

 but rather thin. Scutellum of great size, as long as broad at 

 base, flat, simple, with two pairs of bristles near the end. Meso- 

 phragma small, less convex, subquadrate. Squamae rudimen- 

 tary ; halteres with a large knob. Abdomen short, narrower than 

 thorax, and a little constricted toward the base; hypopygium 

 ventral, of medium size. Legs of proportional size, simple; 

 middle tibiae without distinct apical spur. 



Wings of great size, rather obtuse at end, hyaline, with black 

 spots formed by rounded chitinous tubercles, and besides with 

 a long strong spine (Plate I, fig. 2a) on lower surface in the 

 second posterior cell. Veins bare; auxiliary vein very thin and 

 less distinct; second longitudinal vein long, third and fourth 

 rather sinuous, fifth very short, sixth wholly wanting; second 

 basal and anal cells very narrow, narrowed to the base and 

 almost indistinct. 



It is possible that the peculiar chitinous black calli of the 

 wings, or at least the long spine of the underside, are found ex- 

 clusively in the male ; the female is at present unknown. 



Type, Tylopterna monstrosum sp. nov. 



170. Tylopterna monstrosum sp. nov. Plate I, fig. 2. 



A curious little fly, of strange aspect and coloration. 



Male. Length of body, 2.8 millimeters ; of wing, 3 ; breadth of 

 wing, 1.2. Posterior part of head shining brownish, with a 

 broad, rounded yellow spot beneath the vertex and with a broad 

 yellow stripe at eye border, which unites below with the pale 

 yellowish lower half of head. Anterior part of head whitish 

 yellow, divided into two parts by a broad black horizontal line, 

 which divides the frons from the face, and in which are placed 

 the black antennae. Arista pale yellowish. Proboscis yellowish, 

 palpi whitish. Short pubescence of head whitish ; vertical bris- 

 tles black. 



Thorax shining black, smooth, with reddish brown pleurae; 

 pubescence whitish, bristles black. Scutellum shining black, with 

 the sides and the underside pale yellowish, mesophragma shining 

 black ; halteres whitish. Abdomen uniformly shining black, with 



