o 
244 NEW YORK STATE MUSEUM 
mind in using this key, that I have seen but few species save those 
mentioned in my list or figured in the plates, and other species may 
exhibit characters different from those I attribute to the genus. 
Notwithstanding this, the things found in the species I have seen 
should be suggestive, and should add something to the final work- 
ing out of the system for this group. It is certain that a thorough- 
going study of the antennae, the mouth parts, the legs, or the 
appendages of the abdomen would likewise yield valuable results, 
also, the study of the immature stages, for which I am endeavoring 
to gather material for future use. 
Key to the North American genera of crane flies 
(Based on venational” characters) 
a Rs four branched, the posterior fork more deeply pranehed Oi, bt loybne 
three branched, it is R? and R®*® that are fused. A single anal 
MEUM 2 oi6 sy EAA ae cae IPD WClalOie aR DAE, 
b Rs four branched, M three branched cord deeply indented by first fork 
of M; Scz and cross vein m present ; Idioplasta only.. TANYDERINAE 
bb Rs three branched; M* two branched; cord not indented by the median 
WOOS, SG, Giaal SROSS Wea GW AWSOME. s voccccoccccs PU MCIM OIE TiBIRIIN AUB. 
6M two branched seta eee ee ee ee eee Ptychoptera 
ce. Mone. branched: (sits coer eee eee Bittacomorpha 
aa Rs never four branched; when three branched it is R, and R; that have 
fused (for a few apparent exceptions, all of which have the forks of 
nearly equal length, see p. ante). Two anal veins present (three in 
the fossil “Cladoneura)s 45. Cee Oe eee TIP UILNDANE, 
b Sci: wanting: Re. directed forward and reduced, or wanting: basal de- 
flection of Cu: never extensively fused with M; ........ IMU WILJUN AU 
bb Sc: usually present and joining the costa beyond Sc2, which often 
recedes toward the wing base: sometimes both tips are wanting. 
Cu, usually extensively fused with J/; at its basal deflection, the cross 
vein in m-cu being eliminated thereby.............. LIMNOBIINAE 
c Ry, Rz and Rs extensively fused together from the tips backward in 
a long, straight vein; M skewed forward at its first fork, its base 
being in line with the tip of Cu. Tips of Sc often rudimentary. 
Cross vein m never atrophied: Cylindrotomini 
O} Whey esac) MMi SEOATAIS BE WNDS occ cocvcccvccco00 000000000 Cylindrotoma 
dd M, and M, fused to the wing margin 
e Cross vein m present 
7 Acuenmmeall FOS Swe MMAGIIC. oo 00 00ccog 00009000 000000006 Liogma 
7 Nawal jos suloellolullaie, 5 occ00 ccc v0ccac000000006 Triogma?” 
ee Cross vein m eliminated by fusion of adjacent veins. Phalacrocera 
cc R:, R. and R3 not all fused together into a long, straight tip 
d Rs three branched 
alam not sufficiently acquainted with the genera of this family to attempt a venational 
key for them. I know only those genera figured herewith and Tipula and Pachyrhina , 
Antennal characters seem to have furnished the basis for}most of the genera. 
b Triogma I have not seen. 
