200 M«. n. M'lACHLAN on NISW-ZKALAND TfilClIOrTEUA. 



. men is truncated, containing a nearly circular cavity. ( c? § .) (Plate II. 



fig. 3.) 

 Christchurchj Canterbury (Fereday); 3 (S,l 2- 



Pycnocentria aureola, n. sp. 



P. evectce affinis, sed abdomen maris baud lobatum. 



Long. Corp. \%-2^" ; exp. alar. 6-9"'. 



Head — antennce yellow, witb fuscous annulations ; the basal clothed 

 above with pale primrose-yellow hairs, beneath with black hairs ; 

 vertex blackish, clothed with pale primrose-yellow hairs springing 

 from a rounded flattened tubercle placed on each side, the hairs from 

 each being directed inwards ; maxillary palpi clothed with golden- 

 yellow hairs ; labial palpi fuscescent ; eyes blackish brown. 



Thorax — prothorax with few pale-yellow hairs; meso- and metathorax 

 blackish fuscous, hairless. 



Wings — anterior wings grey, clothed with golden-yellow hairs, but with 

 two or three hairless spaces (perhaps accidentally i-ubbed) on the disk 

 and apical portion, which appear darker than the clothed parts ; the 

 longitudinal impressed fold absent or scarcely evident ; fringes black- 

 ish and yellow intermingled : posterior wings dark smoky grey, with 

 dense blackish-grey hairs ; the subcostal fold evident, but not con- 

 spicuous ; fringes grey. 



Legs yellow , the tibia; and tarsi with adpressed blackish hairs. 



Abdomen fuscous above, reddish fuscous beneath. In the c? there is 

 no ventral or dorsal lobe; app. sup. long, narrow, the apex being 

 obtuse, slightly dilated and turned downwards, yellow ; app. inf. 

 more slender, and equal in length to the app. sup., curved strongly 

 inwards ; penis long, reddish testaceous, on each side with a needle- 

 shaped sheath, the points of which approximate. (J.) (Plate II. 

 figs. 4 & 4a.) 



Christchurch, Canterbury (Fereday); Auckland (Edwards), 3(S. 1 ?; 

 the latter in bad pondition and without abdomen. 



This species bears much resemblance to P. evecta, but may be 

 at once distinguished by the appendices. 



Heltcopstche. 



In the collection of the British Museum are three types of 

 heliciform cases of Trichoptera from New Zealand, in numerous 

 examples. One of these forms is remarkable for its minute size 

 and greatly depressed whorls ; it is composed of very fine grains 

 of sand, cemented together so neatly that the exterior surface is 

 nearly smooth ; another (possibly a more mature form of the 

 first) is much larger, witli the whorls rather more prominent, 

 construetpd iti tlie same manner; a third is still In i-ger, tlie whorls 



