Tur Crane-Fuirs or New York — Parr II 907 
Genus Rhaphidolabis Osten Sacken (Gr. needle + forceps) 
1869 Rhaphidolabis 0. S. “Mon. Divot. N. Amer., part 4, p. 284-277. 
1911 Claduroides Brun. Rec. Indian Mus., vol. 6, p. 288. 
Rhaphidolabis is a small genus, including about fifteen described species 
ranging thruout the North Temperate Zone. The larvae strongly resemble 
those of Dicranota, and the two genera are undoubtedly very closely 
related. 
Rhaphidolabis tenuipes O. S. | 
1869 Rhaphidolabis tenuipes O.S. Mon. Dipt. N. Amer., part 4, p. 287. 
Needham (1908 a: 212-214) found adult flies of the species Rhaphidolabis 
tenuipes in great numbers in tent traps set over Beaver Meadow Brook 
in the Adirondacks in July and August, 1907. Larvae that almost cer- 
tainly belong here were found among the rounded stones in the creek 
bottom. ; 
Larva.— Length excluding caudal lobes, 8-9 mm. 
Length of caudal lobes, 1 mm. 
Abdominal segments 3 to 7 with prominent fleshy prolongations on ventral surface, these 
eing retractile, unpaired, and widely separated on mid-ventral line, and bearing at tip a 
irclet of outcurved hooklets, with series of smaller hooklets beyond. Spiracular disk with 
he two ventral lobes long and obtuse at tips. (Further details are given by Needham.) 
haphidolabis cayuga Alex. (supposition) 
1916 Rhaphidolabis cayuga Alex. Proc. Acad. Nat. Sci. Phila., p. 543-544. 
Larvae which the writer refers to this species were found in Needham’s 
len, Ithaca, New York, on March 30, 1916. Later in the season, in 
pril and May, adult flies of the species are very numerous in this glen, 
nd these account for the specific reference. 
Larva.— Agreeing very closely with descriptions of both Dicranota and Rhaphidolabis 
nuipes. Spiracles large, lying in a distinct longitudinal groove, by the closing of which they 
re capable of being entirely hidden. Antenna long and slender, tapering to apex, which 
ears numerous short papillae. Mandible with third lateral tooth of ventral cutting 
w very long and acute, much exceeding second tooth; basal tooth shaped like a prun- 
g knife, with the cutting edge sinuate; at prosthecal region of mandible, a small tuft of 
out seven or eight long setae. Maxilla having the two lobes firmly united except on 
ical quarter. 
