12 E Canadian Arctic Expedition, 1913-18 



FAMILY TRICHOCERCHXE. 

 Trichocerca longiseta (Schrank). 



Rattulus longiseta JENNINGS, Bull U. S. Fish Comm., vol. 2? (for 1902) 

 1903, p. 341, pi. 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 Rampalrt House, on July 10, 1911. 



Trichocerca mucosa (Stokes). 



Rattulus mucosus JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902), 

 1903, p. 331, pi. 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 (Miiller). 



Rattulus rattus JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902), 1903, 

 p. 333, pi. 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 Hairing. 



Rattulus carinatus JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902), 

 1903, p. 332, pi. 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 JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902), 

 1903, p. 336, pi. 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 JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902), 

 1903, p. 322, pi. 5, figs. 50-52, pi. 13, figs. Ill, 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. 



