DASYP0G0X1NAE 



ROBBER FLIES OF THE WORLD 



71 



and hypandrium similar and the penis guides also 

 prominent and projecting below but less exaggerated. 

 Female terminalia small, protruding as a bilobed flap 

 beyond the last tergite and otherwise characteristic of 

 the tribe. 



Distribution : Oriental : Damalina hirtipes de 

 Meijere (1914) ; l-aticeps Doleschall (1858) ; nitida Her- 

 Mann (1914); plumipes de Meijere (1914); semperi 

 Osten Sacken (1882) ; trigonoides de Meijere (1915). 



Genus Trigonomima Enderlein 



Figukes 74, 413, 858, 867, 1565, 1875, 195? 



Trigonomima Enderlein, Wiener Ent. Zeitung, vol. 33, p. 164, 

 1914. Type of genus : Trigonomima apipes Enderlein, 1914, 

 by original designation. 



Small, grotesque flies, characterized immediately by 

 the greatly elevated, short, humpbacked mesonotum. 

 This appearance is accentuated by the high, vertical 

 metanotum, together with the dense, conspicuous, dorsal 

 and ventral fringes of pile on the femora, especially the 

 middle and hind pairs. The wing has only four poste- 

 rior cells and this character, together with the strongly 

 humped mesonotum separates them from Damalina 

 Doleschall to which they are otherwise closely related ; 

 both have the same type of third antennal segment. 

 Length 6 to 9 mm. 



Head, lateral aspect : The head width is three- fourths 

 its height. Face not visible in profile, even on the lower 

 portion, the contour of the face following the contour 

 of the eye. The eye is of moderate length, tending to 

 be slightly flattened over the middle of the anterior half, 

 but strongly convex above and below and a little longer 

 ventrally. The occiput is prominent especially on the 

 lower portion. The pile of the occiput is scanty, con- 

 sisting of a few rather long, slender, bristly hairs and 

 with no conspicuous or definite bristles. The proboscis 

 is extremely short, very robust, a little swollen towards 

 the base, rather acutely pointed beginning at the outer 

 third ; the apex is more or less conical, rather pointed, 

 and this whole apical third bears dorsally and ventrally 

 numerous short, stiff hairs ; the base ventrally has some 

 long, quite stout bristles. Palpus large and conspic- 

 uous, almost as long as the proboscis ; it consists of two 

 segments, the short first segment hemicylindrical and 

 excavated, the longer second segment swollen distally, 

 cylindrical and clavate, nearly as long as the proboscis 

 and bearing 6 or 7 strong, long, apical bristles, 2 others 

 at the ventral apical margin, 2 more ventrally near the 

 apex ; second segment without pore. Antenna attached 

 slightly above the middle of the head, moderately elon- 

 gate, the first two segments short, especially the first, 

 which is smaller than the second. The third segment is 

 slightly compressed laterally, a little over twice as long 

 as the combined length of the first two segments; its 

 greatest width lies a little beyond the middle ; it is only 



slightly narrowed at the base and apex. The apex is 

 obliquely ventroapically truncate and bears dorsally a 

 short, distinct bristly spine and bears ventrally, besides 

 1 or 2 short setae, a long, slender bristle; its length is 

 three- fourths the length of the third segment. First 

 segment with 4 or 5 long, slender bristles ventrally, one 

 dorsally, second segment with 2 such bristles ventrally, 

 one dorsalry. 



Head, anterior aspect : The head is wide, nearly twice 

 the height. Face below antenna less than one-fourth 

 the head width, convergent below the middle of the face 

 and divergent at the lowest point of the eyes. Front 

 and vertex distinctly divergent above. The subepisto- 

 mal area not differentiated from the face and is reced- 

 ing; the lateral facial crease is wide and deep. Face 

 thickly micropubescent, apilose, with 12 to 15 long, 

 quite slender bristles on the lower half, the more ventral 

 elements slightly stouter. The front is extremely short, 

 pollinose or minutely micropubescent; the side of the 

 front has 3 or 4 pairs of slender bristly hairs; vertex 

 deeply excavated, with obliquely sloping sides ; the ocel- 

 larium is large, wide and high, also with obliquely 

 sloping sides ; it is extended forward so that the ocelli 

 are easily seen extended anteriorly forward from the 

 lateral view. It bears a pair of slender bristles between 

 the ocelli, a pair between the posterior ocelli, two pairs 

 of rather longer bristles immediately behind the ocelli, 

 and a pair set somewhat lower behind the ocelli. Eye 

 facets exceptionally enlarged centrally. 



Thorax: The thorax is micropubescent or subpolli- 

 nose, including all except the medial portion of the 

 mesonotum. The mesonotum and the entire thorax ex- 

 tremely high and humped, its elevation accentuated 

 by the high vertical metanotum. Pile of the mesono- 

 tum scanty along the anterior border, becoming more 

 abundant behind the humerus. There is an irregu- 

 lar, double row of scattered, acrostical bristles anterior- 

 ly, all of these long, erect, and fine. There are 8 to 

 10 fine, long hairs on the humerus, the remaining pile 

 is more stiff and slightly bristly in character, and be- 

 comes a little longer on the posterior third of the meso- 

 notum, especially long and abundant on the slopes 

 above the postalar. There are no differentiated bristles 

 except, upon the scutellum, where near the middle of 

 the disc is a transverse row of 6 long, erect, slender 

 bristles. Propleuron extremely small and short and 

 bearing a few stiff, short hairs ventrally ; anterior col- 

 lar with a band of fine, erect pile ; postlateral pronotum 

 with a few similar hairs. Upper mesopleuron with 

 abundant, fine, erect pile, the posterior mesopleuron 

 with a wide band of quite long, bristly, appressed pile. 

 Posterior sternopleuron with a few stiff hairs; ptero- 

 pleuron and hypopleuron apilose; metapleuron excep- 

 tionally villose with a wide, nearly vertical band of 

 numerous, long, slender bristles and bristly pile. Meta- 

 notal slopes micropubescent only, the lateral meta- 

 sternum and the ventral metasternum with some long, 

 fine pile, the latter comparatively narrow, chitinized, 



