J. R. MALLOCH 241 



13. Fore tibia with dense erect setulose hairs on ventral surfaces except on 



basal third, the length of which is about as great as the diameter of 

 the tibia; hind femur without long bristles on basal half of postero- 

 ventral surface, usually with very short bristles or setulae. 



monticola Malloch 



— Fore tibia without such hairs; hind femur with some long bristles on basal 



half of posteroventral surface brunneinervis Stein 



14. Thorax with three pairs of postsutural dorsocentral bristles; fere tibia 



without any posterior median bristles fraterna new species 



— Thorax with four pairs of postsutural dorsocentral bristles 15 



15. Only the posterior notopleural bristle surrounded with fine hairs; basal 



abdominal sternite bare tipulivora new species 



— Both notopleural bristles surrounded with fine hairs; basal abdominal 



sternite hairy nigricans Johannsen 



16. Third wing-vein with a few fine hairs at base below; basal segment of 



fore tarsus with the sensorj^ hairs along posteroventral margin short 

 but distinct; basal abdominal sternite bare 17 



— Third wing- vein bare at base; thorax with two or three pairs of strong 



presutural acrostichal bristles, and four pairs of postsutural dorso- 

 centrals texensis new species 



— Third wing-vein bare at base; thorax with two pairs of fine presutural 



acrostichals and three pairs of postsutural dorsocentrals. 



pallidula Coquillett 



— Third wing- vein bare at base below; species not as above in other respects; 



thorax without strong presutural acrostichals 18 



17. Thorax with four pairs of postsutural dorsocentral bristles; hypopleura 



with some microscopic hairs near lower posterior angle; metathoracic 

 spiracle large, without small black hairs on its lower margin at middle. 



quieta Stein 



— Thorax with three pairs of postsutural dorsocentral bristles; hypopleura 



without hairs near lower posterior angle; metathoracic spiracle small, 

 with two or three small black hairs on its lower margin at middle. 



pulvillata Stein 



18. Sensory hairs on posteroventral margin of basal segment of fore tarsus 



conspicuous' 19 



— Sensory hairs on posteroventral margin of basal segment of fore tarsus 



inconspicuous or absent 26 



19. Antennae and palpi, or at least the former i>artly yellow 20 



— Antennae and palpi l)lack 2.3 



20. Hind femur with long hairs (m almost the entire length of posteroventral 



surface quieta Stein 



— Hind femur without long hairs on posteroventral surface, sometimes with 



one or two bristles 21 



^ I have not seen perjida Stein, so place it in both segregates here. 1 have 

 arbitrarily accepted the hj-jjopleura as hairj- above in front of spiracle in this 

 species. 



TRAXS. AM. ENT. SOC, XLVIII. 



