Triglyphus. 55 



which are black on the duU parts, but paler on the shining apical 

 part; at the margin there are longish, pale hairs, increaslng in length 

 towards the base. Venter black, somewhat translucent on the basal 

 part, with pale hairs, dark on the fourth segment. Genitalia forming 

 a small knob. Legs black, knees yellowish red, the hind knees some- 

 what obscurely, the basal part of the middle metatarsus likewise pale. 

 All tibiæ with a slight excision or incurvation on the posterior side 

 near the apex, most distinct on the hind tibiæ. Hind metatarsus 

 somewhat thickened. Anterior femora with long hairs on the postero- 

 ventral side, hind femora on the antero-ventral side; they are white, 

 on the anterior femora dark towards the apex; anterior tibiæ with 

 short, mainly dark hairs, hind tibiæ with a long fringe above, which 

 may be dark or pale, and with somewhat strong hairs on the postero- 

 ventral side in the upper two thirds; front and especially hind tarsi 

 with an adpressed, yellow pubescence below, the latter also with long 

 hairs on the anterior side. Wings slightly tinged ; stigma brownish 



Fig. 11. Wing of T. 'primus. 



yellow; the upper marginal cross-vein sloping outwards, with a more 

 or less distinct curve, the upper angle acute. Squamulæ brownish 

 with darker margin and a pale brownish fringe. Halteres yellow. 



Female. Frons bluish black, a little punctate, with a small depres- 

 sion somewhat above the antennæ, black-haired above, white-haired 

 below, but above the antennæ again with black hairs; in the middle 

 of the frons, at the eye-margin, a pair of small dust spots. Postocular 

 hairs all white. Antennæ with the third joint a little longer than in 

 the male, and more pale. Thorax with short, white pubescence. Ab- 

 domen bluish black, densely somewhat finely punctate, with short, 

 pale pubescence, only dark at the hind part of the second segment 

 on the disc. Legs with the knees more pale than in the male, the 

 first joint on the front tarsi and the two first joints on the middle 

 tarsi more or less distinctly yellow; the hairs all white. Squamulæ 

 white. 



Length 5 — 6 mm. 



