16 c Canadian Arctic Expedition, 1913-18 



Male. — Length, 12-5 mm.; wing, 14 mm. 



Head discoloured. Antennae broken. 



Pronotal scutum dark, the scutellum dull yellowish. Mesonotal prsescutuih 

 dark coloured, almost black in the type, but badly discoloured, the thoracic 

 stripes, if present normally, being obliterated; normal specimens are almost 

 certain to be very dark grey. Pleura blackish, grey pruinose; dorso-pleural 

 membranes dull yellow. Halteres brown, the knobs darker. Legs with the 

 coxae black, grey pruinose; trochanters brown; femora reddish brown, the, tips 

 narrowly and indistinctly darkened; tibiae brown, the apices blackened; tarsi 

 dark brown. Wings nearly hyahne, the costal and subcostal cells concolourous 

 with the rest of the wing; veins brown; wings in the vicinity of the stigmal 

 region injured; venation: R2 persistent for its entire length; the m-cu crossvein 

 inserted just beyond the fork of M. The fly is full-winged. 



Abdominal tergites reddish brown with a broad, black, median stripe; 

 ninth tergite black; sternites dull brown with an interrupted blackish median 

 stripe. Male hypopygium with the ninth tergite (PI. Ill, fig. 41) very large 

 and prominent, black, chitinized, the caudal margin with an acute, V-shaped^ 

 median notch, finely denticulate, the lateral angles produced far caudad into 

 flattened ears. Ninth pleurite incomplete, the suture indicated beneath, an 

 acute dorso-c'audal arm of the pleurite runs beneath the tergal lobes. Eighth 

 sternite with a broad, shovel-shaped, median lobe extending caudad and dorsad, 

 its caudal margin evenly and gently notched and provided with short, delicate 

 hairs. Eighth tergite completely concealed beneath the seventh tergite. 



Locality: Holotype, &, west of Kongenevik, Camden bay, Alaska, July 4, 

 1914 (F. Johansen). No. 442. 



This interesting new species is related to T. pribilofensis Alexander from 

 the Pribilof islands off the western coast of Alaska. It is an entirely distinct 

 species, being full-winged and the male hypopygium quite differently constructed 

 although both species have the curious spoon-like elongation of the eighth sternite. 

 I have seen another species of the same group from Kamchatka, eastern Siberia 

 tipula kaWichatlcensis Alexander. 



Very recently I have received from Prof. Hine another specimen in much 

 better condition. This specimen may be considered as paratypical and the 

 following additional characters should be noted: 



Male: — Length, 14 mm.; wing, 13 mm. 



Frontal prolongation of the head dark purplish brown above, more yellow 

 laterally. Antennae rather long, the scape a very little paler than the dark 

 brownish black flagellum; flagellar segments rather deeply incised beneath. 

 Head light grey, a small brownish blotch on the disk of the vertex. Eyes small; 

 genae prominent. 



Mesonotal stripes very indistinct, brown, ground-colour of the naesonotum, 

 light grey. Pleura light grey, the dorso-pleuraJ membranes light yellow. 



Paratype, <?, Katmai, Alaska, July, 1917 (J. S. Hine). 



Specimen in the collection of Prof. Hine. 



Family RHYPHID^. 

 Subfamily TRICHOCERIN^. 



Genus Trichocera Meigen. 



Trichocera Meigen; Illiger's. Magazine, vol. 2, p. 262; 1803. 



At the present time this genus of flies offers almost insuperable taxonomic 

 difficulties. Some twenty-five or thirty species have been proposed, but that 

 very many of these are synonyms of others is unquestioned. It seems now that 

 the only hope of straightening this apparently hopeless tangle is for some 



Journal of the New Yovk Entomological Society, vol. 26, p. 72; 1918. 



