186 Transactions. — Zoology. 



Genus Tanypus, Meigen, 1803. 



" Antennae 15-jointed. Wings pubescent. Marginal cross- 

 vein and second longitudinal distinct. Fork of the fifth longi- 

 tudinal situated at the base of the posterior cross-vein " 

 (Skuse). 



Key to the Species. 

 Legs unicoloured, except at the articulations. 



Metanotum dark-brown . . . . . . . . T. languidus. 



Metanotum fulvous . . . . . . T. debilis. 



Tibise and metatarsi wkh a dark band in the middle . . T. mains. 



Tanypus languidus, sp. no v. 



Male. — Antennae pale-brown, with brown plumes; eyes 

 and face dark-brown. Thorax pale-yellowish, with a double 

 central brown stripe reaching halfway, and a lateral stripe 

 on each side, commencing a little before the end of the median 

 pair; posterior margin of the mesonotum, and a median line 

 from the posterior margin towards the central stripes dark- 

 brown ; scutellum pale-yellow ; metanotum dark-brown. 

 Abdomen brown, each segment with a square pale-yellow 

 spot on each side, except on the last two segments. Femora 

 pale-yellow, broadly tipped with brown ; tibiae and tarsi tawny. 

 Fore metatarsus about one- half the length of the tibia. 

 Halteres white. Wings hairy, yellowish, with brown spots on 

 all three cross-veins, at the tips of the longitudinal veins, and 

 two each in the first posterior and anal cells ; veins yellow. 

 Auxiliary vein rather indistinct, not reaching the costa. Third 

 longitudinal much curved, meeting the costa at the apex of 

 the wing. Posterior branch of the fifth longitudinal meeting 

 the margin of the wing at right angles. Marginal cross-vein 

 joining the costa. Length, 5 mm. ; wing, 4 mm. 



Female. — Abdomen brown, the anterior portion of each 

 segment pale. Legs pale yellowish-tawny, the tips of the 

 joints brown. Wings broader than in the male, and the 

 marginal cross-vein joining the tip of the first longitudinal. 

 Length, 4^ mm. ; wing, 4 mm. 



Hab. Christchurch (F. W. H.). 



Tanypus debilis, sp. nov. 

 Male. — Head and antennas pale-tawny. Thorax pale 

 greenish-yellow, with a double central brown stripe ending 

 halfway, and a brown spot on each side opposite the ter- 

 mination of the stripe. Scutellum pale-green ; metanotum 

 pale-tawny, with four brown spots. Abdomen green, the 

 anterior half of each segment darker than the posterior half ; 

 the hairs white. Legs pale-tawny, the articulations brown. 

 Fore metatarsus about two-thirds the length of the tibia. 

 Wings hairy ; the anal angle white, the rest brownish, with 

 bluish iridescent spots (in reflected light) in the first, second, 



