The Crane-Flies of New York — Part I 941 



12. The subfasciafa group. — Wings conspicuously cross-banded, an uninterrupted white 

 band beyond the cord; tip of vein ^2 atrophied. The species of this group are evidently 

 derived from the last preceding group, being reduced forms. 



T. subfasciata Loew 

 T. penobscot Alex. 



13. The hebes group. — A well-marked group of species, including forms with elongate 

 antennae in the male sex and those with the antennae short in both sexes; hypopygium 

 elongated and curiously upturned at an angle with the remainder of the abdomen; eighth 

 sternite three-lobed, the margins clothed with golden-yellow hairs; wing pattern a peculiar 

 spotting and blotching of browns, grays, and whites. 



T. hebes Loew 



T. latipennis Loew 



T. grata Loew 



T. affl'cid Dietz 



T. helderbergensis Alex. 



14. The macrolabis group. — Ninth pleurite greatly produced caudad into finger-like lobes; 

 wing pattern spotted, the costal region with four larger blotches. 



T. macrolabis Loew 

 T. macrolaboides Alex. 

 T. loeiviana Alex, may be considered as coming close to this group, the ninth pleurite 

 being produced caudad as a short, subspatulate lobe. 



15. The arctica group. — A well-defined group of species; female ovipositor with but two 

 functional valves, which are strongly serrated along their outer margins; ninth tergite showing 

 two distinct types, in one of which ( T. arctica, T. alticola) the sclerite is very small and the 

 caudal margin is evenly concave and heavily claitinized, in the second {T. longiventris, T. 

 caroliniana) the tergite is feebly chitinized and the sclerite has a small dorsal transverse 

 knob at about midlength. 



T. arctica Curt. 

 T. labradorica Alex. 

 T. serrulata Loew 

 T. septentrionalis Loew 

 T. longiventris Loew 

 T. caroliniana Alex. 

 T. fultonensis Alex. 

 T. alticola Alex. 



16. The angustipennis group. — A large group of species; wings spotted with white on a 

 brown or a grayish ground; eighth sternite usually unarmed, but in some species {T. serta) 

 with a small median lobe, in others (7". senega) with prominent fleshy lateral lobes; ninth 

 tergite variously shaped; outer pleural appendage broad and fleshy; female ovipositor with 

 the valves usually elongated, much shorter and sublyriform in T. senega, never serrated. 



T. balioptera Loew 

 T. centralis Loew 

 T. canadensis Loew 

 T. ternaria Loew 

 T. angustipennis Loew 

 T. ignota Alex. 

 T. serta Loew 

 T. senega Alex. 



17. The marmorata group. — Wing pattern pale, marmorate gray, brown, and hyaline; 

 m-cu cross-vein usually distinct and rather close to the fork of M. 



T. fragilis Loew 

 T. ignobilis Loew 



18. The abdominalis group. — An extensive group of large flies, including some of the 

 largest in the genus. The species are more numerous in the West and thence southward 

 (T*. oblique-fasciata, T. craverii, T. commiscibilis, T. ablula, T. rupicola, T. albimacula, and 



