Crane-flies 13. c 



Tipula arctica Curtis. 



Tipula arctica Curtis; Description of the insects brought home by Commander J. Clark 

 Ross. Appendix to Ross's "Voyage to the Arctic regions, p. Ixxvii, Plate A, fig. 15; 1831. 



Male.— Length, 13-17 mm.; wing, 13 -5-17 -5 mm. 



Female. — Length, 20-21-5 mm.; wing, 16-17 mm. 



Palpi dark brown. Frontal prolongation of the head rather elongate, 

 blue-grey; nasus stout. Antennae (PI. II, fig. 17) deeply serrate, each segment 

 of the flagellum deeply incised beneath, the apical enlargement being only a little 

 smaller than the basal swelling but not provided with verticils. Head blue- 

 grey. 



■*" Mesonotal praescutum dull grey with three broad blue-grey stripes, the 

 median one often narrowly spUt by a vitta of the ground-colour; these stripes 

 are sometimes narrowly margined with brown; the thoracic interspaces with 

 numerous black setigerous punctures; remainder of the thorax blue-grey includ- 

 ing the coxffi of the legs. Halteres brown, the knobs darker. Legs with the 

 "ffemora reddish yellow broadly tipped with dark brown; tarsi dark brown. 

 Wings subhyaline with conspicuous brown and grey markings, cells C and Sc 

 a little more yellowish; a small brown spot at the origin of Rs; stigma large, 

 sending a cloud down the cord to cell first Mi; greyish brown clouds in the anal 

 cells, at the base of cell Cu, at midlength and at the end of M and in the apex 

 of the wings; venation (PI. I, fig. 10). 



Abdominal tergites in the male with segment one, black; two to four, reddish 

 yellow with broad sublateral stripes and an indistinct median stripe brownish 

 grey; remaining segments dark brownish grey; sternites two to four, reddish 

 yellow, broadly darkened laterally; terminal sternites brownish grey; the 

 segments of the abdomen are very narrowly and indistinctly margined with paler. 

 Male hypopygium with the ninth tergite (PI. Ill, fig. 35) small with a deep and 

 broad rounded caudal notch, the dorsum rounded into a saucer, the lateral 

 lobes with four or five blunt teethi The inner pleural apperidage is illustrated 

 (Plate III, fig. 37). 



The female is similar to the male in most respects, but the abdomen is 

 differently coloured being dull grey with a broad, dark brown, interrupted, dorso- 

 median stripe; the basal tergites a httle brightened on either side of the dorso- 

 median line; abdomen not excessively elongated as in the related T. longi- 

 ventris; dorsal shield jet-black, shiny; tergal valves of the ovipositor brownish 

 black. The ovipositor (PI. Ill, fig. 43) has the dorsal shield elongate, a little 

 longer than the tergal valves of the ovipositor; these tergal valves have about 

 fifteen teeth along the outer lateral margin; the sternal valves are very reduced 

 as in this group of species, acicular, the pair forming a sublyriform organ (PL III, 



fig. 40). 



This was the most abundantly represented species in the collection including 

 nearly one-half of the material, as follows: — 



Locahties: West of Konganevik, Camden bay, Alaska, July 4, 1914 (F. 

 Johansen). Four d-'s, Nos. 196-199. Port Epworth, mouth of Tree river, 

 Coronation gulf, Arctic Canada, July 16, 1915 (J. J. O'Neill). Two d-'s, Nos. 102 

 and 104; one 9, No. 103. Bernard harbour, Northwest Territories, June 21, 

 1915, one &, No. 1328; July 4, 1915, one 9, No. 1076; July 7, 1915, one <?, 

 one 9 Nos. 1233, 1234; July 12, 1915, two 9, Nos. 756, 789, one <?, No. 757; 

 July 19, 1915, cf, 9, Nos. 1266, 1267; July 22, 1915, cT, 9, Nos. 1062, 1063; 

 July-August, 1915, six &, 9, Nos. 829-834; July 1-14, 1916, seven c?, 9, Nos. 

 420, 421, 424, 426, 427, 428, and 430. 



Unless stated otherwise the material was taken by Mr. Johansen. Pupae 

 are pinned with Nos. 197, 199, and 834. ^ 



The immature stages of this interestmg crane-fly will be considered on 

 pages 18 and 19, under the second part of the report, on the immature stages. 



