Triglyphus. 



53 



the hind metatarsus somewhat thickened; anterior femora with long 

 hairs postero-ventrally, hind femora antero-ventrally, hind tibiæ with 

 a fringe above, and hind metatarsus with long hairs on the anterior 

 side. Two claws, two pulvilli and a small, linear, hairy empodium. 

 Wings with the medial cross-vein long before the middle of the discai 

 cell, the marginal cross-veins sloping outwards, the iipper angle at the 



Abdomen of T. primus. 

 Fig. 9. Male, the apical Fig. 10. 



segment is the fourth. Female. 



cubital vein aeute; vena spuria weak. Alula well developed. Plumula 

 with fine hairs. Alar squaraulæ with short hairs, thoracai squamulæ 

 with long, furcately divided hairs. 



The developm ental stages (of the European species) are not known. 

 — Loew described two American species (Berl. ent. Zeitschr. 1863, 

 Cent. IV, 61, 62.) pubescens and modesta; Webster (Canad. Entom. 

 XXX, 19) has reared the latter from larvæ feeding on Schizoneura 

 lanigera; with regard to these two species see below. 



This genus is quite distinct ; the characters lie in the abdominal 

 segments; the foUowing genera have in the male four not transformed 

 segments, the second to fourth of about equal length (fig. 25); Trigly- 

 phus has also four segments, but the fourth is quite small, only the 

 second and third of equal length and rather long (fig. 9). In the female 

 the foUowing genera have five normal segments, with second to fourth 

 equal (fig. 26), Triglyphus thereagainst only four, and also here the 

 fourth is quite small, the second and third long (fig. 10), and the fourth 

 ventral segment lies under the posterior end of the third dorsal. The 

 statement by Loew and Schiner that the abdomen has one (visible) 



