The Crane-Flies of 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 flics 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, 2.3 mm. ^ 



Coloration pure white, head and apical two-thirds of breathing tube pale brown, chitin- 

 ized. In the living 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; mesothoracic 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 doHcate 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, v/hich 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 clyptus 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). 

 Chaetota.xy of epicranium (Plate XIII, 7) with three lateral groups of long bristles, the 



