246 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



border of tergal saucer high and elevated, more or less notched medi- 

 ally. Inner dististyle e\en broader, the outer caudal angle strongly 

 produced. $. L. 15-17 mm.: w. 16-19 mm. 9. L. 23-25 mm.; 

 w. 18-20 nmi. 



(June, July) Arctic and Subarctic North America, southw. to mts. of Ont., Que., 

 N. B.,' N. H., \'t. and N. Y. (Hudsonian, Canadian). 



T. {VestipJex) serrulata Lw. 



1864. Tiqnda serrulata Loew ; Berlin. Ent. Zeitschr., 8 : 58. 



Still known only from the unique type female but apparently rep- 

 resenting a species distinct from either halio'ptera or canadensis, the 

 near allies. ? . L. 25 mm. ; w. 20.5 mm. 



Subarctic North America: Hudson Bay Region. (Hudsonian). 



Subgenus Arctotipula Alexander 

 1938. Arctotipula Alexander; Philippine Journ. Sci., 52:410-411. 



Distinguished from Vestiplex chiefly by the long, pale body 

 vestiture, the unusually glabrous nature of the wing^veins, and the 

 structure of the ovipositor, the cerci being abruptly narrower than 

 the remainder of abdomen, pale and without serrations. 



Nasus present or lacking. Stpiama naked. Male hypopygium 

 with tergite and sternite separate. Tipula dicldnsotii is referred here 

 with some doubt. 



Key to Species 



1. Wings tinged with brown, stigma relatively inconspicuous ; m-cu uniting with 



AI-Mi at or before midlength ; male hypopygium with tergite produced into 



a median lobe (Fig. 27, F) ' dickinsoni 



Wings subliyaline, the stigma dark brown, conspicuous ; m-cu uniting with 

 Mi just beyond base; male hypopygium (unknown in piliceps) with tergite 

 notched medially (Fig. 27, E) ; Arctic and Subarctic species 2 



2. Coloration of praescutum blue-gray, with four darker, in cases nearly black, 



stripes, the intermediate pair tending to be confluent; a median vitta on 

 vertex ; median stripe on abdominal tergites broad ; female with eighth 



tergite not conspicuously expanded ; cerci small besseisi 



Coloration of praescutum dull light gray, with four light brown stripes ; 

 median vitta on vertex indistinct ; median stripe on abdominal tergites 

 narrow ; female with eighth tergite flattened and expanded ; cerci long, 

 pale piliceps 



Tipula {Arctotipula) besseisi O. S. (Fig. 27, E). 

 1876. Tipula besseisi Osten Sackcn: Proc. Boston Soc. Xat. Hist., 

 19 : 42. 



Antennae black throughout. Xasus lacking. Coloration of body 

 blue-gray; lateral borders of abdominal tergites paler. Conspicuous 

 erect pale setae on head, thoracic interspaces, sternopleurite and all 

 coxae. Ninth tergite (Fig. 27, E) : .sketch of type by Nathan Banks. 

 S. L. 11-12 mm.; w. 13-14 mm.; antenna, about 4-4.2 mm. 



(July) Arctic North America, Greenland to Alaska. 



