MR. B. M'LAOllIiAN ON NEW-ZEA.LA.ND TUtCHOPXEIl/V. 201 



more elevated and separated, and the exterior surface covered with 

 coarser sand-grains, giving it an irregular appearance, 



I have not adopted the generally followed practice of describing 

 in detail and naming these forms, as the name given to the insect 

 must always take precedence of that bestowed upon the case of 

 its larva. 



I know no insect from New Zealand sufficiently allied to H. 

 borealis, Hagen, from North America (the only species yet bred 

 from an heliciform case), to be considered generically identical 

 therewith. Supposing these curious cases to be the work of several 

 genera of Sericostomidce, it then seems probable that the species 

 of my genus Pycnocentria may manufacture the New-Zealand 

 forms ; but this is mere conjecture. 



As the European H. Shuttleworthii, of Bremi, was the original 

 type of Uelicopsyche, it follows that that generic term should be 

 retained for the insect (should it not have been described) con- 

 structing that case, and that the species from America and other 

 parts of the world, if generically differing from the European, must 

 receive new names. 



Eamily LEPTOCERID^. 

 Grenus TethA-Centbon, Brauer^ 



Tetracentkon amabile, n. sp. 



Fuscus, griseo-hirsutus ; antennae fuscae, anguste albido-annulatre : ahe 

 anticaj elongatae, angustatse, ad apicem oblique tiuncata;, albido- 

 cinereaj, fusco nebulosa; et irrorataj ; posticaj latae, subhyalinse, griseo- 

 flavo pubcscentes : pedes albido-cinerea; ; tarsis tibiisque anterioribus 

 fuscesceutibus : abdomen fuscum ; maris appendicibus superioribus 

 triangularibus, fimbriatis ; iuferioribus crassis, sursum directis. 



Long. Corp. 4-6'"; exp. alar. 12-13"'. 



Head — antennee very slender, longer in the cf than in the $ , fuscous, 

 the base of each joint heyond the basal with a narrow whitish ring; 

 basal joint wholly fuscous, with grey hairs ; vertex fuscous, clothed 

 with grey hairs ; face very densely clothed with grey hairs ; palpi 

 fuscous, with grey hairs ; the maxillary very long, first and fourth 

 joints nearly equal in length, second very long, third longer than tlie 

 first or fourth, but much shorter than the second, fifth very slender, 

 and about as long as the third ; eyes fuscous, slightly brassy. 



Thorax pale fuscous ; mesothorax very long, a broad depressed channel 

 in the centre, on each side of which is a raised longitudinal line, 

 posteriorly with a large round raised lobe, flattened on the top, scu- 

 tcllum triangulai', almost hairless, there being only a few long greyish 



