THe CrANE-FLIES oF NEw YorK—Part ] 925 
Genus Dicranota Zetterstedt 
1838 Dicranota Zett. Ins. Lapponica, Dipt., p. 851. 
In the genus Dicranota there are about fifteen known species, restricted 
to the northern Holarctic region. The species are readily distinguished 
from those of Rhaphidolabis by the supernumerary cross-vein in cell R; 
of the wings. The larvae are carnivorous, feeding largely on Tubifex 
worms (Miall, 1893). The local species of Dicranota may be separated 
according to the following key, which is adapted from a key to the 
North American species already published by the author (Alexander, 
1914 b:601). 
eB BV IG MISE MMP P AE) ooo i ajar 5k x cafe tidied ciesSicie meee arc siting ecieie inside om aloe ene daees eee 2 
Croll Jilin [ORES So 016 6 GOT Bb DURE ORO Oe one ECCS oi A ae Og mene 3 
2. Halteres with the knobs darkened; antennae of male much longer than the thorax. [Mon. 
Dip NeeAmersspart 4..p) 2ol—2825 T8698. ces sk as ce oo D. eucera O. 8. 
Halteres pale; antennae of male short. [Proc. Acad. Nat. Sci. Phila., p. 249. 1859.] 
((Eabaiies SCID, INGO) 2 iis ne eeeatel is ese ce a eg ei ee rier Weer EN ti D. rivularis O.S. 
3. Cell ist M2 present; color. of body yellowish. [Proc. Acad. Nat. Sci. Phila., p. 599-600, 
Deeper ee ONAN (PlatesxoT N67). - 2-2. ec cc seine Oe ee D. pallida Alex. 
Cell 1st Mz absent; color of body gray. [Proc. Acad. Nat. Sci. Phila., p. 600. 1914] 
(Plate XLI, 168. y 0:04:06 6 SOIREE RAPES Sin renee pate oth ee Na iad oa D. noveboracensis Alex. 
Genus Rhaphidolabis Osten Sacken 
1869 Rhaphidolabis O.S. Mon. Dipt. N. Amer., part 4, p. 284. 
1869 Plectromyia O.S8. Mon. Dipt. N. Amer., part 4, p. 282. 
The genus Rhaphidolabis includes about fourteen described species 
found in the Holarctic region and in the mountainous sections of the 
Oriental region. The larvae are carnivorous, and live in rich organic 
mud or in the streams near by. Needham (1908:212-214) has given 
a description of the larva of the species R. tenuipes. The following key, 
adapted from a key to the North American species of Rhaphidolabis 
already published by the author (Alexander, 1916:541-542), divides the 
local species of the genus: 
1. Antennae 15-segmented; cross-vein m present. (Subgenus Rhaphidolabina Alex.) [Mon. 
Dipt. N. Amer., part 4, p. 288. 1869.] (Plate XLI, 170.)........... R. flaveola O. Ss 
Antennae 13- segmented; CLOSS=VeIntm: ADSENEe ea me ee te oe ee 
2. Cell M; absent. (Subgenus Plectromyia O.8.) [Plectromyia modesta O. S. Mon. ae 
NeeAmmereaps 264s. F869)]| (Plate Xo, WA) oss coc hoc e R. andra (0.8 ) 
Cell M; present. (Subgenus Rhaphidolabis (OSB) | Seen eee den area Ei Oe de an a re 
3. Cell R2 petiolate. [Mon. Dipt. N. Amer., p. 287. 1869.] (Plate XLI, 171.) 
R. tenuipes O.S. 
WCEP ISCSSILC ee verte syeyelctere ctial Srersveusis a (eters cial'e cekeleiovsalelslererevecieieiiershcvaitrs harsh eleleiersis ee ec 4 
