Tue CrRANE-Fiies or New York — Part II 771 
The only observations on the adult flies that the writer has ever been 
able to make were in reference to five specimens taken in New York 
State in 1909 (Alexander, 1910:254). These were swept from rich vege- 
tation along the banks of the Sacandaga River in northeastern New York. 
The adult flies have never been recorded from the vicinity of Washington, 
but are regional, since the species ranges thruout the eastern United 
States as far south as Georgia (in the mountains). 
Larva.—Total length, 11.8 mm. 
Length excluding breathing tube, 5.6-6 mm. 
Length of breathing tube alone, 5.8-6.2 mm. 
Length of ninth segment of abdomen (chitinized part of breathing tube), 3.4-3.6 mm. 
Length of anal gills, 2-2.1 mm. 
Diameter of body, 2.8 mm. 
Coloration pure white, head and apical two-thirds of breathing tube pale brown, chitin- 
ized. Intheliving larva there is a transparent, subcircular area on the dorsum of segment 7 
thru which the beating of the heart can be clearly seen, but in preserved specimens this area 
is hard to perceive. (Plate XIII, 5 ) 
Body eucephalous, entirely smooth, shiny, dorsum of segments 2 to 9 each with a trans- 
verse group of tiny points. Thorax with the first segment longer than the succeeding two 
segments taken together, narrowed anteriorly, broader behind; mesothoracie segment about 
half as long as the first and about twice as long as the very narrow metathorax. Abdominal 
segments gradually increasing in length to the seventh; segments 8 and 9 abruptly narrowed 
into a stout, elongate breathing tube which is about equal in length to remainder of body; 
basal, or proximal, part of tube (segment 8) shorter than terminal part (segment 9) and 
not chitinized; segment 9 elongate, chitinized, with a deep transverse constriction a short 
distance before tip; this apical part, and the region just before the constriction, smooth, 
the remainder of the last segment with numerous delicate transverse wrinkles. Spiracular 
disk (Plate XIII, 6) surrounded by five lobes, one dorsal, two lateral, and two ventral 
in position; dorsal lobe the smallest, lateral lobes the broadest; lobes tipped with sharp, 
chitinized spines, which are continued for a short distance down the outer face of each lobe; 
fringes of long hairs along margins of lobes; disk with a brownish tinge around spiracles 
and an elongate-oval median mark between, and slightly below, the spiracular level; inner 
face of ventral lobes with indistinct, tiny, brown punctures. Spiracles large, separated by 
a distance about equal to diameter of one. Anal tracheal gills two, one on either side of 
the base of segment 8, very large and pinnately branched, there being about fifteen branches 
to each gill; each of these branches constricted into four or five lobules; lobes at their tips 
broadly obtuse (Plate XIII, 9). 
Head short and broad, epicranium chitinized. Across ventral face, the sclerite firmly 
united by a narrow transverse band; median part densely punctulate, this area delimited 
laterally and posteriorly by an indistinct curved line. On dorsum, the prefrons conspicuous 
and the clypeus distinct from the labrum. Head ‘and mouth parts provided with numerous 
setiferous punctures, each of which is multisetose (from five to eight setae to each puncture). 
Chaetotaxy of epicranium (Plate XIII, 7) with three lateral groups of long bristles, the 
