538 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Trioyphona paludicola 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. 



Antenna? dark brown throughout; head and thorax grayish brown, 

 the mesonotal prsescutum 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 prsescutum pale grayish brown with 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 brown. 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; tibia} and tarsi dark brown. 

 Wings grayish subhyaline, the costal cells more suffused, brownish 

 yellow; tiny dark brown dots at Sc 2 , origin of Rs, tip of Sc h cross-vein 

 r, above the fork of Rs, cross-vein r-m and a narrow seam along the 

 basal deflection of Cur, paler gray clouds underneath the tip of 

 R 2 +z and near the tip of 2nd A; veins dark brown, Sc more yellowish. 

 Venation (Plate XXVIII, fig. 53): distance between Sc 2 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 # 3 a little longer than r-m; cell 1st M 2 closed, long and narrow; 

 cell Mi 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. 



