246 Transactions. — Zoology. 



Genus Hydeobiosis, McLachlau (1870). 



Antennae slender, the basal joint shorter than the head, 

 and stout. Maxillary palpi long and pubescent, the two basal 

 joints short and stouter than the others, fifth not so long as 

 the third and fourth together. Anterior wings elongate, the 

 costal and dorsal margins nearly parallel ; the apex longly 

 elliptical, clothed with woolly pubescence and longer hairs on 

 the veins ; fringes short ; neuration not very distinct. Pos- 

 terior wings shorter and broader, folded, rounded at the apex ; 

 fringes long on the dorsal margin ; pubescence slight ; no 

 closed discoidal cell ; a transverse vein unites the upper 

 branch of the sector with the radius ; a second unites the 

 lower branch of the sector with the superior cubitus, and a 

 third is placed below this, much nearer the base of the 

 wing. Spurs 2.4.4; those on the anterior tibiae small, on 

 the others long and straight. 



Distribution. — New Zealand. 



Hydrolbiosis frater. 



Hydrobiosis frater, McLachlan, Journ. Linn. Soc, vol. 10, 

 p. 207, pi. 2, figs. 9a, 9b (1870). 



Brown ; antennae brown with narrow yellowish rings ; 

 vertex blackish, with dark-grey hairs ; oceUi large, yellowish. 

 Anterior wings with long woolly black and grey hairs ; ptero- 

 stigma elongate, brown ; a space on the middle of the dorsal 

 margin pale-grey, tufts of longer black hairs along the dorsal 

 margin of the male only. Posterior wings subhyaline, the 

 fringes blackish. Legs dull-red; anterior and intermediate 

 tibiae with a narrow median pale ring. Abdomen brown, 

 yellowish beneath ; the male with three ventral teeth. Length 

 of the body, <? 5 mm., ? 7 mm. ; expanse of the wings, 

 ^ 18 mm., ? 23 mm. 



Locality. — Christchurch. 



Hydrobiosis umbripennis. 



Hydrobiosis umbripennis, McLachlan, Journ. Linn. Soc, 

 vol. 10, p. 208, pi. 2, figs. 9c, 9d (1870). 



Brown ; antennae yellow, with indistinct brown rings ; 

 ocelli large and conspicuous, yellow. Anterior wings brown, 

 with blackish and whitish hairs ; pterostigma darker, elon- 

 gate ; neuration pale yellowish-testaceous, apical fringe with 

 yellowish dots and tufts of black hairs along the cubitus 

 near the base. Legs pale - testaceous ; the anterior tibiae 

 and tarsi rather brownish externally, with paler rings. Ab- 

 domen brown above, yellowish beneath ; the male with but 



