Wings.—Forewing black in life, fading to deep fuscous in the dried specimen; scattered over wing, but especially on apical half, are numerous small rounded spots of a slightly paler colour, not at all prominently marked, and a more conspicuous pale-yellowish patch on posterior margin at end of Cu2 and 1A. Cu1 a stout vein, strongly marked in black. Hindwing dull fuscous, partially transparent, with darker venation. Text-Fig. 16.—Hydropsyche philpotti n. sp., ♂. Appendages (× 45). Note the vertically upstanding gonapophyses and the remarkable penis. (10 per cent. KOH preparation.) Text-fig. 16 shows the very characteristic genital appendages of this species, in which the gonapophyses are held vertically upright, while the remarkably shaped penis projects outwards horizontally, carrying a strong terminal lobe from which projects a slender bifid spine. ♀. Unknown. Types.—Holotype male and three paratype males, Dun Mountain, Nelson, 3,000 ft. (8th January, 1922, A. Philpott); all in Cawthron Institute collection. Evidently allied to H. occulta (Hare), but easily distinguished by its black coloration and the form of its appendages. Family Calamoceratidae. Up to the present no representative of this family has been recognized in New Zealand, though in Australia several species of the genus Anisocentropus are known, one of which extends as far south as Tasmania. I am now able to show that the very remarkable genus Philorheithrus Hare belongs to this family. This genus was proposed by Hare in 1910 for Hudson's species “? agilis,” placed by that author in the family Sericostomatidae, between the genera Pseudoeconesus and Olinga. Even a cursory examination of so large an insect would show that the maxillary palpi of the male were five-segmented, a character which at once puts it out of the family Sericostomatidae. Hare, in the diagnosis of his new genus, correctly states the structure of the maxillary palpi; but he does not attempt to place the insect in any family, nor are his generic characters selected in such a way that it is possible to do so without a complete re-study of the insect itself. The characters on which the genus Philorheithrus finds its place in the family Calamoceratidae are as follows: Maxillary palpi five-segmented