THE CRANE-FLIES oF NEw YorK — Part | 931 
Genus Tanyptera Latreille 
1805 Tanyptera Latr. Hist. Nat. Crust. et Ins., vol. 14, p. 286. 
1832 Xiphura Brulle. Ann. Soc. Ent. France, vol. 1, p. 206. 
In the genus Tanyptera there are supposedly twelve described species, 
of which three or four are from eastern North America and the remainder 
are from the Palaearctic region. The remarkable variation in color, 
however, is strongly indicative that the number of species is very much 
less than that given, and it is possible that there is but a single species 
within the limits of this paper. The question can be definitely settled 
only by the wholesale breeding of larvae to the adult stage. Until more 
is known about these flies it is best to recognize the full number of forms, 
always keeping in mind, however, the foregoing remarks. 
The larvae live in the wood of deciduous trees, often in prostrate trunks 
that are fairly sound. The adult flies are easily distinguished from all 
other crane-flies by the tripectinate antennal segments of the male and 
the elongated acicular ovipositor in the female. The flies are shiny, 
and often are brilliantly colored with black and reddish yellow, simulating 
Ichneumonidae and other hymenopterous insects. 
The following key divides the local species of Tanyptera: 
1. Wings smoky black; body coloration black, the male with feet and abdomen also black, 
the female with legs and base of abdomen reddish yellow. [Ctenophora fumipennis 
Os Se Lrocsbnt. soc) Phila. vol. 3p. 47. 1864.22 .5.45.5-.40- T. fumipennis (O. 8.) 
WINANS; TONE, 10 EVEN 5 sce, AEs ect nap eS Pr aU er rE ape dale, om ae 2 
2. Wings tinged with topazine yellow, the stigma dark brown; body coloration varying 
from black to yellow, the feet reddish yellow. [Ctenophora topazina O. 8S. Proc. Ent. 
Socwehilammvolsoup. 47-48. VSG4 so. 5 Seppe eect eeceis cea ceo T. topazina (O. S.) 
Wings hyaline, the stigma brown; head black; body coloration varying from black to 
yellow. [Ctenophora frontalis O. S. Proc. Ent. Soc. Phila., vol. 3, p. 48-49. 1864.] 
CP ei OSL ITIL, TIVES eek ate ran a ea ea ear Nae ear ee teen nv ce bY F T. frontalis (O. 8.) 
Genus Ctenophora Meigen. 
1800 Flabellifera Meig. Nouv. Class. Mouch., p. 13 (nomen nudum). 
1803 Ctenophora Meig. Illiger’s Mag., vol. 2, p. 263. 
1910 Phoroctenta Cog. Proc. U. 8. Nat. Mus., vol. 37, p. 589. 
In the genus Ctenophora a condition exists which is similar to that 
in Tanyptera, there being fifteen described species which are very closely 
related and many of which are undoubtedly synonymous. Two forms 
are here recognized, and even these may represent but one species. 
A number of larvae of Ctenophora were found in a decaying tree by 
Johannsen (1910), who reared from them a considerable number of adults 
