125 Canadian Arctic Expedition, 1913-18 
FAMILY TRICHOCERCIDA. 
Trichocerca longiseta (Schrank). 
Rattulus longiseta JENNINGS, Bull U. S. Fish Comm., vol. 22 (for 1902), 
1903, p. 341, pl. 8, figs: 67-72. 
Collected by Jessup in a pond near New Rampart House, at the International 
Boundary and Porcupine river, on June 12, 1911; lakes on Old Crow river 
flats, 40 miles north of New Rampart House, .on July 3, 1911; two lakes on Old 
Crow river flats, 55 miles north of New Rampart House, on July 10, 1911. 
Trichocerca mucosa (Stokes). 
Rattulus mucosus JENNINGS, Bull. U. 8. Fish Comm., vol. 22 (for 1902), 
1903, p. 331, pl. 10, figs. 86-91. 
A few specimens in Jessup’s collections from a slough of Old Crow river, 
near New Rampart House, on August 7, 1912. 
Trichocerca rattus (Miller). 
Rattulus rattus Jennines, Bull. U.S. Fish Comm., vol. 22 (for 1902), 1903, 
p. 333, pl. 11, figs. 100, 101. 
Collected by Jessup from lakes 48 miles north of New Rampart House, on 
July 7, 1911; ponds on Old Crow river flats, 60 miles north of New Rampart 
House, on July 11, 1911; small muddy pool, 25 miles north of New Rampart 
House, on July 17, 1911; it was rare in all of these collections. 
Trichocerca cristata Harring. 
Rattulus carinatus Jennines, Bull. U. 8. Fish Comm., vol. 22 (for 1902), 
1903, p. 332, pl. 11, figs. 95-97. 
A few specimens were collected by Jessup from pools at Fort Yukon, on 
May 24, 1912. 
Trichocerca bicuspes (Pell.). 
Rattulus bicuspes JenNtncs, Bull. U. 8. Fish Comm., vol. 22 (for 1902), 
1903, p. 336, pl. 8, figs. 73-76. 
Rare in Jessup’s collections from lakes on Old Crow river flats, 40 miles 
north of New Rampart House, on July 3, 1911; two lakes on Old Crow river 
flats, 55 miles north of New Rampart House, on July 10, 1911. 
_ Trichocerca scipio (Gosse). 
Rattulus scipio Jmennines, Bull. U. 8. Fish Comm., vol. 22 (for 1902), 
1903, p. 322, pl. 5, figs. 50-52, pl. 13, figs. 111, 112. 
Collected by Jessup from a muskeg lake, 38 miles north of New Rampart 
House, on June 25, 1911. 
Diurella porcellus (Gosse). 
‘ 
Collected by Johansen among algae growing on stones in the river bed 
at Bernard harbour, on August 16, 1915; by Jessup from lakes on Old Crow 
river flats, 40 miles north of New Rampart House, on July 3, 1911; two lakes 
on Old Crow river flats, 55 miles north of New Rampart House, on July 10, 1911. 
Diurella tenuior (Gosse). 
In Jessup’s collections from lakes on Old Crow river flats, 40 miles north 
of New Rampart House, on July 3, 1911. 
