30 Transactions. 



tinct series, tlie grey markings about the veinlets of each series being con- 

 fluent and not in the form of distinct spots. Hindwings : Veins 7 and 9 

 furcate. Legs reddish-brown, almost unicolorous. 



Length, 8 mm. Expanse of wings, 19 mm. 



Hah. — New Zealand. 



Leptoperla hudsoni, n. sp. 



^ . Fuscous. Antennae shorter than forewings, dark fuscous. Head 

 and thorax blackish-fuscous ; abdomen rather paler. Forewings greyish- 

 fuscous ; posterior veinlets very distinct, outlined with dark fuscous ; 1st 

 sector terminally furcate. Hindwings greyish - fuscous. Legs reddish - 

 brown ; tibiae paler and rather slender. Caudal setse slender, as long as- 

 abdomen, fuscous. 



Length, 8 mm. Expanse of wings, 17 mm. 



Hab. — Karori, Wellington. 



*t^' 



The New Zealand species of Leptoperla may readily be identified by 

 the following artificial key : — 



, f First sector of forewings terminally furcate 



( First sector of forewings simple 

 2 f Posterior veinlets of forewings surrounded by grey spots 



( Posterior veinlets of forewings merely ,outliiied . . 

 o J Reddish-brown 



I Blackish-fuscous 



2 

 3 



L. confnsa. 

 L. hudsoni. 

 L. fiilvescens. 

 L. macidata. 



The characters afforded by the neuration seem to separate the genus into- 

 two natural divisions, but such a schism is inadvisable in practice in the 

 present state of our knowledge. 



The Tasmanian species {L. opposita, Wlk.) has the posterior veinlets of 

 the forewings very numerous and distinct, and not surrounded by spots ; 

 and while the posterior femora have a distinct paler band, the knees are 

 dark fuscous. It is also a larger insect than either L. confusa or L, 

 macidata. 



Genus Heteroperla, gen. nov. 



Antennae strong, 1st joint large and cylindrical, 2nd practically uniform" 

 with its successors. Labial palpi very short ; 1st and 2nd joints minute ; 

 3rd and 4th equal, ovate ; 5th very small and rounded. Prothorax sub- 

 quadrate, rather broader than head. Forewings : Upper branch of 1st 

 sector and lower branch of 2nd sector furcate, cubital furcate at J. the 

 posterior half of the forewings Avith 7 parallel veins ; subcostal veinlets 

 numerous. Hindwings broad, subtriangular ; 1st cubital vein furcate, 

 others simple. Caudal setae short, incurved. 



Distribution : New Zealand. 



Type, Heteroperla cyrene {Chloroperla cyrene, Newm. ; Perla (?) cyrene, 

 Wlk. et McL. ; Stenoperla (?) cyrene, Hutton). 



This genus would, no doubt, have been created long ago but for the 

 fact that there were no specimens available which were sufficiently well 

 preserved for detailed examination. It seems to have no affinities with 

 any other existing genus of Perlidce, except perhaps with Stenoperla, McL., 

 with which, however, it is only very remotely connected. 



