12 c Canadian Arctic Expedition, 1913-18 
neath by a V-shaped notch, beneath the margm of the eighth sternite a small 
brush of long golden hairs. Eighth sternite unarmed. 
Locality: Holotype, cf, 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 ilf 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 R2 persists for its entire length and the petiole of cell 
Ml 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 swelhng 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 spht 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 subhyahne, 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 which is nearly 
hyahne; conspicuous, brownish grey clouds along vein Cu, in the middle and end 
of cell M and including most of cell Cih; 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 (PI. Ill, 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 pleurite complete, moderately 
large; outer pleural appendage elongate, flattened-cyUndrical, 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 l)ut 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, cf, Bernard harbour, Northwest Territories, July 12, 
1915 (F. Johansen). No. 790. Allotype, 9, Herscliel island, Yukon Territory, 
July 1916. No. 838. Paratype, 9, with the allotype. No. 839. 
