CADDIS-FLIES. 81 



Sub Family 3— HYDROPSYCHIDES. 



"•Maxillary palpi 5-jointed in both sexes, long, more or less deflexed, the 

 last joint whip-shaped, and composed of numerous minute jointlets, slightly 

 pubescent. Wings pubescent. Antennas variable. Larvae without any 

 prominent hump on the first abdominal segment, external respiratory fila- 

 ments present or absent, when present usually fasciculate " (Hutton). 



" An extensive group in which the larvae are believed 

 to be chiefly of carnivorous habits. They vary, according 

 to the species, as to the nature of the respiratory fila- 

 ments, and live in fixed abodes ; these are less tubular 

 than is the rule in the portable cases, and are formed from 

 pieces of sand and stone, spun together and fixed to 

 large" stones under water. Sometimes several larvae live 

 together in loosely compacted structures of this kind, and 

 only form true cases when about to undergo their meta- 

 morphosis " (Sharp). 



Genus HYDKOPSYCHE, Pictet (1834). 



■' Antennae very slender, the basal joint short and bulbose, the others 

 after the second elongate, each slightly thickened within. Maxillary palpi 

 with the second joint long, the third and fourth shorter, almost triangular, 

 the fifth as long as the others united. Anterior wings narrow and elongate, 

 obliquely truncated at the apex ; anal lobe scarcely indicated ; discoidal cell 

 closed. Posterior wings much shorter, broader, folded, obtuse, usually with 

 a long closed median cell. 



" Distribution. — Cosmopolitan." 



HYDROPSYCHE FIMBRIATA. 



Hydropst/che fimbriata, McLachlan, Trans. Ent. Soc. 

 London, 1862, p. 9. 



This species has been found at Wellington, and at 

 Auckland. 



The expansion of the wings of the male is about j£ inch, of the female 

 from 1| to 1J inches. " Antennae pale-ochreous, annulated with dark 

 brown ; eyes varied with brown and black. Head and thorax reddish- 

 brown. Abdomen blackish above. Legs ochreous. Anterior wings tawny- 

 ochreous, much darker towards the apex, with numerous small pale spots ; 

 several of these are larger towards the base ; on the inner margin elongate 

 pale spots alternate with the dark ground-colour; fringe of the apical margin 

 conspicuously yellowish-white. Posterior wings clothed with clay-coloured 

 hairs. Inferior anal appendages in the male with very long terminal joints, 

 which are pointed and curved upwards, approximating at the tips. Penis 

 pale, with a callosity before the apex beneath; apex dark-red, tumid. 

 Length of the body, 8 mm. ; expanse of the wings, 22 mm." (Hutton). 



This insect has a deceptive resemblance to OEconesus maori, but, apart 

 from special structural characters, may be distinguished by its slightly 

 excised wings. 



7 



