1915.] NATURAL SCIENCES OF PHILADELPHIA. 487 
The insect was common on June 5, 1913, in a woody tract along 
the Stillwater Bayou, Orono, Me., where it occurred with Dicranomyia 
liberta, Erioptera caloptera, E. armata, and Tipula hella. 
The fly was reared from a large aquatic larva found in the Indian 
Spring near Ithaca, Cayuga Lake, N. Y., where it occurred in the 
beds of water-cress (Radicula nasturtium-aqualicum) in company of 
other Tipulid larvae, such as Pedicia albovitta, Limnophiki quadrata, 
Tipula abdominalis and T. hella, as well as a host of the usual aquatic 
organisms. Other larvae of this species, likewise strictly aquatic, 
were found in Coy Glen, Ithaca, N. Y., a rapid-flowing gorge stream. 
Tipula triton sp. n. 
Coloration light yellow; antennae bicolorous; thoracic stripes 
reddish brown; abdomen with a series of about four conspicuous 
rounded brown spots along the sides; male hypopygium with the 
ninth tergite trifid; penis-guard subtended by two very large blade- 
like appendages which are drawn out apically into sharp points. 
Male. — Length, 13.2-13.5 mm.; wing, 13.5-13.6 mm. 
Frontal prolongation of the head rather long and slender, ])ro^vnish 
yellow, the nasus distinct; palpi short, bro^vn. Antennte moderately 
long, the three basal segments dull yellow, the remaining segments 
of the flagellum with a distinct dark brown basal enlargement, the 
apex of the segments brownish yellow, on the terminal three or four 
segments more brownish. Head pale yellowish gray A\dth an indis- 
tinct jjrownish subimpressed median line. 
Thoracic dorsum light yellow -svith three indistinct light reddish 
brown stripes of which the median one is bisected by a narrow 
median ground vitta; the lateral praescutal stripes begin immediately 
behind the prominent pseudosutural foveas; scutum dull light yellow, 
each lobe Avith two reddish brown spots which are approximated; 
scutellum and postnotum dull light yellow. Pleura yellowish^ 
heavily whitish poUinose. Halteres rather short, the stem yellowish, 
the knob brown. Legs with the coxae yellowish, whitish pollinose; 
trochanters yellow; femora yellow, the apex narrowly brown; tibiae 
yellowish brown, the apex narrowly and very indistinctly darker; 
tarsi dark brown. Wings sul^hyaline with a faint brownish tinge, 
the costal cell more yellowish; the stigma large, light brown, indis- 
tinct; a narrow vitreous band before the stigma extending along 
the cord into cell 1st M2. Venation as in Plate XVI, fig. 11. 
Abdominal tergites broAvnish yellow, the segments six and seven 
dark bro\ATi; eight yellowish, the ninth reddish; the apices of the 
segments are very narrowly ringed with silvery; on segments three 
