April, 1920] Crane-Flies of Alaska 201 



Tipula alaska Alexander. 



1918 Tipula alaska Alexander; Can. Ent., Vol. 50, pp. 412-414. 



One male specimen from Katmai, August, 1917. 



Tipula fragilina Alexander. 



1919 Tipula fragilina Alexander; Can. Ent., Vol. 51, pp. 171, 172. 



A few Specimens from Kodiak in September, 1919, (Jas. S.. 

 Hine). Prof. Hine states that the flies of this species were very 

 numerous in the woods during September. 



Tipula taenigaster, sp. n. 



General coloration of the thorax light gray, the prsescutal stripes 

 very ill-defined ; legs dull yellow ; wings subhyaline ; abdomen long and 

 moderately slender; ovipositor with only the tergal valves functional, 

 these short and stout, the outer face flattened and reticulate. 



Female. — Length 20 mm.; wing, 13.5 mm. 



Frontal prolongation of the head dark above, hght gray pruinose; 

 lateral and ventral surfaces obscure brownish yellow ; nasus rather long 

 and very broad at the base; palpi brown. Antenna with the basal seg- 

 ment light brown, pruinose above; flagellum black. Head light gray, 

 the middle of the vertex between the eyes with a brown cloud and a 

 capillary dark brown line. 



Mesonotum clear light gray, the pr^scutum with three very indis- 

 tinct and ill-defined darker gray stripes; a very restricted yellowish 

 triangular area at the humeral region; scutellum brown, more sparsely 

 pruinose than the remainder of the thorax. Pleura light gray, the dorso- 

 pleural membrane and the area immediately ventrad of the base of the 

 halteres dull yellow. Halteres light brown. Legs with the coxse light 

 gray; trochanters dull yellow; remainder of the legs dull yellow with 

 only the distal tarsal segments darkened. Wings comparatively narrow, 

 subhyaline; stigma comparatively large, brown; veins brown. Vena- 

 tion: base of R2 nearly perpendicular at origin; petiole of cell Mi nearly 

 equal to m; cell 1st M2 long and narrow, about as long as cell Mi; 

 m-cu punctiform. 



Abdomen comparatively long and slender; basal tergites pale 

 brown; remaining tergites rather bright yellow; a distinct, slightly 

 interrupted, dorso-median line; lateral margins of the tergites rather 

 broadly grayish buff; basal sternites yellowish; segments five to eight 

 pruinose. Ovipositor and dorsal shield light castaneous; valves of the 

 ovipositor very short and stout, the outer face flattened, microscopically 

 pitted and reticulate and with a narrow ridge down the middle; prox- 

 imal face convex, shiny, provided with pale, erect hairs; sternal valves 

 microscopic. 



Habitat. — Alaska. 



Holotype, 9, Katmai, July, 1917 (Jas. S. Hine). 



