THe CrANE-Fiirs or New YorK— Part I 887 
-Rhyphidae, the Trichocerinae are the most generalized, the Mycetobiinae 
the most specialized, of the groups. 
The subfamilies may be separated by the following key: 
1. Two distinct anal veins; radial sector three-branched............ Trichocerinae (p. 887) 
A single distinct anal vein; radial sector two-branched.......................-...... 2 
By (CTT AGG AL Les SOV WSISI SO ss ae ne Rhyphinae (p. 888 
CellbsieMeMackings nce can cauiitc ooo fae telsan code as sala ehh anaalle Mycetobiinae (p. 888) 
SUBFAMILY Trichocerinae 
The subfamily Trichocerinae includes but two genera — Trichocera, 
and Ischnothrix Bigot of Cape Horn. 
Genus Trichocera Meigen 
1800 Petaurista Meig. Nouv. Class. Moueh., p. 15 (nomen nudum). 
1803 Trichocera Meig. Illiger’s Mag., vol. 2, p. 262. 
1911 Paracladura Brun. Rec. Indian Mus., vol. 6, p. 286. 
In the genus Trichocera there are about twenty described species, 
of which the majority are Holarctic in their distribution but a few are 
from India and the antipodes. The species of this genus are in a very 
chaotic condition taxonomically, and it seems difficult to remedy this 
until the European and American forms can be critically studied and 
compared. There can be little doubt that many of the species are 
Holarctic in their distribution and the three or four evident species within 
the limits here considered may be conspecific with the European forms. 
The larvae, so far as known, live in decaying vegetable matter (Johannsen, 
1910). The adult flies are common in autumn and early spring, and appear 
in small swarms on warm, sunny daysin winter. During the winter months 
they are often found in cellars, resting on the windows. ‘They are also to 
be found in mines, and the writer has seen specimens from a Colorado 
silver mine taken at a very considerable depth by Dr. H. B. Hungerford. 
Some of the swarms of these flies number many thousands of individuals. 
The following key divides the local species of Trichocera: 
1. Second anal vein subsinuate; veins long-hairy; ovipositor fleshy. (Subgenus Diazosma 
Bergr.) (Journ. N. Y. Ent. Soc., vol. 24, p. 124-125, pl. 8, fig. 10. 1916.] (Plate XLI, 
GOS) PUMNPR ec teste ory sc hintenichel oiler eucuatleite, nite a) attege reteueksiatedal T. subsinuata Alex. 
Second anal vein short, incurved to the anal angle; veins not long-hairy; ovipositor chitin- 
ized, turned downward, the concavity being on the lower face. (Subgenus TJ'richocera 
TMIGER)) 6 5 0 cna d SRSA aH Fa el ne RR Ee are CAPR eee eo 2 
2. Wings with two brown clouds. [List Dipt. Brit. Mus., vol. 1, p. 84. 1848.] 
T. bimacula Walk. 
Wings unicolorous. [Winter Insects of New York, p.9. 1848.] (Plate XLI, 165.) 
«7. brumalis Fitch 
