12 c Canadian Arctic Expedition, 1913-18 



neath by a V-shaped notch, beneath the margin of the eighth sternite a small 

 brush of long golden hairs. Eighth sternite unarmed. 



Locality: Holotype, <?, Bernard harbour, Northwest Territories, July 10, 

 1916 (F. Johansen). No. 213. 



Similar to T. aperta Alexander (imperfecta Alexander, preoccupied) of 

 Labrador in the open cell first Af 2 , but distinct in the dark frontal prolongation 

 of the head, the uniformly dark antennae, the blackish trochanters and abdomen, 

 etc. In aperta the tip of R% persists for its entire length and the petiole of cell 

 ilfi is very much longer than in the present species. 



This interesting species is dedicated to the collector, Mr. F. Johansen. 



Tipula diflava, n. sp. 



General colouration grey; antennae black, the second segment abruptly 

 yellow; abdominal tergites orange with three broad black stripes; wings clouded 

 with brown and grey; male hypopygium with the ninth tergite large, the caudal 

 margin deeply notched medially and with a small acute tooth at the base of the 

 notch. 



Male. — Length, 14 mm.; wing, 14-1 mm. 



Female. — Length, 20-22 mm.; wing, 17-2-18-3 mm. 



Palpi black. Frontal prolongation of the head black, the nasus elongate. 

 Antennae (PI. II, fig. 16) with the first scapal segment narrow basally, 

 enlarged distally, black, yellowish at the apex; segment two yellow; flagellum 

 black, the flagellar segments with the basal swelling prominent with about four 

 conspicuous bristles. Head black, dark grey pruinose. 



Thorax grey, the mesonotal praescutum with three broad darker grey stripes, 

 the middle one split by a line of the ground-colour; hairs on the thoracic inter- 

 spaces short, pale, not conspicuous. Halteres yellow, the knobs dark brown, the 

 apices a little brighter. Legs with the coxae dark grey; trochanters brown; 

 femora brownish yellow broadly tipped with black; tibiae and tarsi dark brown. 

 Wings subhyaline, clouded with brown and grey; cells C and Sc yellowish; 

 stigma dark brown; a dark brown spot at the origin of M, origin and end of the 

 sector; apex of the wing brownish grey, interrupted by cell R 5 /s which is nearly 

 hyaline; conspicuous, brownish grey clouds along vein Cu, in the middle and end 

 of cell M and including most of cell Cui; apices of the anal cells largely grey; 

 in the male the pattern is the same but paler; venation (PI. I, fig. 9), pattern 

 omitted. 



Abdomen with the first tergite black; second to sixth orange, with three 

 broad black stripes, a narrow median one, broadening out behind and two sub- 

 lateral stripes; on the caudal margins the black stripes tend to be confluent 

 interrupting the orange; terminal segments largely blackish; lateral margins 

 of the tergite pale yellowish; hypopygium mostly blackish; sternites largely 

 black. Male hypopygium (PI. Ill, fig.' 34) with the ninth tergite (PL III, fig. 33) 

 extensive, the caudal margin with a very deep V-shaped notch, at the base of 

 which is a tiny tooth that sends a carina cephalad onto the dorsum of the sclerite; 

 lateral lobes thin, rounded at their apices. Ninth pleurrte complete, moderately 

 large; outer pleural appendage elongate, flattened-cylindrical, pale, with a dense 

 covering of long hairs ; inner pleural appendage flattened into an extensive blade, 

 the margin with sharp teeth. 



The female is similar but larger; valves of the ovipositor slender, elongate, 

 acicular, not at all like the arctica type where the tergal valves are flattened 

 transversely with the outer margin toothed and the sternal valves are very 

 minute. 



Locality: Holotype, d", Bernard harbour, Northwest Territories, July 12, 

 1915 (F. Johansen). No. 790. Allotype, 9, Herschel island, Yukon Territory, 

 July 1916. No. 838. Paratype, 9, with the allotype. No. 839. 



