218 Trmisactions . — Zoology. 



Suhimago. — Wings pale-grey ; fore wings with a small 

 yellowish spot at the roots of the subcostal nervure ; nervules 

 bordered with dark-brown, their borders confluent here and 

 there into spots, producing an irregular chequered appearance. 

 Length of setae, J 13 mm., J 11 mm. 



Locality. — Christchurch. 



Easily distinguished from C. humeralis by the dark- 

 bordered nervules forming here and there irregular blots, by 

 the smaller extent of yellow at the base of the wings, and by 

 the banded femora. 



Genus Oniscigastek, McLachlan (1873). 



Imago. — Legs all functional ; hind tibiae shorter than the 

 femur, but longer than the tarsus ; ungues dissimilar in each 

 tarsus. Hind wings well developed, obtusely subovate, the 

 dilatation of the marginal area obtuse in front ; axillar region 

 well developed, largely occupied by numerous long anasto- 

 mosing nervules from the inner margin. Median caudal seta 

 shorter than the outer pair. Abdomen very robust ; the sixth 

 to ninth segments winged on each side. 



Distribution. — New Zealand. 



Easily recognised by the terminal segments of the abdomen 

 being produced on each side into horny wings with sharp 

 points directed backwards. 



Oniscigaster wakefleldi. 



Oniscigaster ivakeficldi, McLachlan, Ent. Mo. Mag., vol. 10, 

 p. 108 (1873) ; Journ. Linn. Soc, vol. 12, p. 139, pi. 5, 

 figs. 1-5; Eaton, Trans. Linn. Soc, 2nd series, Zool., 

 vol. iii., p. 224, pi. 21, fig. 36 ; Sharp, in Cambridge 

 Natural History, vol. v.. Insects, p. 442, fig. 284. 



Imago. — Dark-brown, rather lighter in the male. Wings 

 vitreous, faintly tinged with light-brown ; nervules dark-edged. 

 Legs light-brown, banded with darker. Length, 16-21 mm. ; 

 wing, 3 16 mm., $ 19-21 mm. ; setae, 17 and 5 mm. Ex- 

 panse of the wings, 3 35 mm., 5 40 mm. 



Subimago. — Body greyish. Wings subopaque, smoky 

 grey ; nervules of the anterior portion of the fore wing 

 broadly edged with dark-brown. Length of the setge, 13 and 

 7 mm. 



Locality. — Canterbury and Nelson. 



In 1874 this insect was common in the neighbourhood of 

 Christchurch. I have lived there during the last nineteen 

 years without seeing a single specimen. Whether they have 

 been killed off by the trout or by the sparrows I cannot 

 say. 



