40 Mr. R. M'Lachlan 07i the Neuropterous 



28. Pycnocentria evecta^ M'Lachlan. 

 rycnocentria evcda, M'Lachl. Journ. Linn. Soc, Zool. vol. x. p. 199 

 pi. ii. fig. 3 (details).* 



29. Pycnocentria aureola^ M'Lachlan. 

 Pycnocentria aureola, M'Lachl. Journ. Linn. Soc, Zool. vol, x. p. 200, 



pi. ii. figs. 4 & 4 a (details).* 



Helicopsyche. 



This term was applied to certain cases of the larvae of Tri- 

 choptera found in Europe, which depart from the usual forms 

 and assume a spiral condition, thus resembling small Helices, 

 formed of sand grains neatly cemented together ; and this re- 

 semblance has often deceived conchologists, who have described 

 them as shells. They have since been found in streams almost 

 all over the world, and their real nature has long been known. 

 Recently in North America the perfect insect of one species 

 has been bred. Three forms occur in New Zealand {cf. 

 M'Lachlan, Journ. Linn. Soc, Zool. vol. x. p. 200). There is 

 yet much mystery about the species that form them ; and it 

 is possible that they are the work of more than one genus of 

 Sericostomatidas. The European forms have not been referred 

 to any particular insects ; and in Europe no insect has been 

 discovered that absolutely agrees generically with that bred in 

 America. The same remark applies to those from New Zea- 

 land ; and I have a suspicion that they may be the work of 

 species of Pycnocentria. It is much to be desired that colonial 

 entomologists will investigate this matter ; the cases are pro- 

 bably found attached to stones in streams. 



Leptoceridae. 



Genus Tetracentron, Brauer. 



30. Tetracentron sarothropus^ Brauer. 



Tetracentron sarothropus, Brauer, Verb, zool.-bot. Ges. in Wien, 1805, 

 p. 418 ; id. Eeise der ' Novara,' Neurop. p. 12, t, i. fig. 5 (details).* 

 Pseudonema obsoleta, M'Lachl. Trans. Ent. Soc. Loud. ser. 3, vol. i. 

 p. 305 (cf. M'Lachl. Journ. Linn. Soc, Zool. vol. xi. p. 128). 



31. Tetracentron amabile, M'Lachlan. 



Tetracentron amabile, M'Lachl. Journ. Linn. Soc, Zool. vol. x. p. 201, 

 pi. ii. figs. 5-5 d (details).* 



Genus Notanatolica, M'Lachlan. 



32. Notanatolica cognata^ M'Lachlan. 



Leptocern^'i cor/naixs, M'Lachl. Trans. Ent. Soc. Lond. ser. 3, vol. i. 

 p. '}06.* Notanatnltca cognata, M'Lachl. Inc. cit. vol. v. p. 258. 



