538 PROCEEDINGS OF THE ACADEMY OF [Oct., 
Tricyphona paludioola sp. n. (Plate XXVIII, fig. 53.) 
Canadian-Transitional life-zone of the northeastern United States, 
as yet known only from New York. It flies in early spring (May 
7-20), and is found in swampy, stagnant localities. 
Tricyphona paludicola sp. n. 
Antennae dark brown throughout ; head and thorax grayish brown, 
the mesonotal praescutum with three dark brown stripes, the middle 
one split by a broad line of the ground-color; abdomen brown, the 
tergites uniform in color; wings almost unicolorous, the dark markings 
reduced to punctiform dots and narrow seams. 
Male. — Length, 7.6-8 mm.; wing, 8.6-8.7 mm. 
Female. — Length, 10.5-10.9 mm.; wing, 10.5-10.8 mm. 
Rostrum and palpi dark brown. Antennae black, the flagellar 
segments shortened and gradually narrowed. Head grayish brown. 
Mesonotal praescutum pale grayish brown Avith three dark brown 
stripes, the middle stripe very broad and more or less bisected by a 
narrow, median vitta of the ground-color, lateral stripes short, 
narrow; scutum gray, the lobes with a rounded dark brown spot; 
scutellum and postnotum light gray. Pleura light gray, the dorso- 
pleural membranes pale brown. Halteres light brown, the knobs 
dark browTi. Legs with the coxae reddish, gray pruinose; trochanters 
brownish yellow; femora dark brown, the fore pair with the basal 
quarter a little brightened, middle pair with the basal third, hind 
pair with about the basal half brightened; tibiai and tarsi dark brown. 
Wings grayish subhyaline, the costal cells more suffused, brownish 
yellow; tiny dark brown dots at Sd, origin of Rs, tip of Sci, cross-vein 
r, above the fork of Rs, cross-vein r-m and a narrow seam along the 
basal deflection of Cui] paler gray clouds underneath the tip of 
R2+3 and near the tip of 2nd A; veins dark brown, Sc more yellowish. 
Venation (Plate XXVIII, fig. 53): distance between Sc2 and the 
origin of the sector about equal to the sector alone; Rs angulated 
and often spurred at origin; r at the tip of Ri; distance between the 
fork of Rs and cross-vein r-m about equal to that cross- vein; petiole 
of cell Rs a little longer than r-m; cell 1st Mi closed, long and narrow; 
cell Ml present, usually longer than its petiole; cross-vein m-cu 
present or barely obliterated by the fusion of the adjacent veins. 
Abdominal tergites dark grayish brown; sternites similar with the 
basal segments indistinctly ringed with paler; hypopygium con- 
colorous with the rest of the abdomen; valves of the ovipositor 
brownish yellow. 
Habitat. — Northeastern United States. 
