36 Mr. R. M'Lachlan 07i the Nenropterous Genus 



vanishes in some species, showing a good transition between 

 Corydalis and Cliauliodes^ the wings having the numerous 

 transverse nervules of the former. Authors have variously- 

 adopted these several terms. Walker, in his British-Museum 

 Catalogue, uses Corydalis^ Chauliodes^ and Hermes^ placing 

 in the latter Rambur's most tjjiical forms of Neuromus and 

 many species of Chauliodes ; and the two species described in 

 his paper in the Trans. Ent. Soc. London, new series, vol. v. 

 should both be referred to Neuromus. Hagen, in his North- 

 American Synopsis, adopts only Corydalis and Chauliodes^ 

 placing in the former the typical species of Neuromus ; and in 

 this he was for the most part followed by me in my revision 

 of Walker's species in the ' Journal of the Linnean Society, 

 Zoology,' vol. ix. Brauer, in the first part of his elaborate 

 Catalogue of Neuroptera, has Corydalis^ Chauliodes^ and Neu- 

 romus • and though the list of the species he proposes to place 

 under each is not yet published, I opine that he views the ge- 

 nera in the same light as I now do. The three genera may 

 be briefly diagnosed thus : — 



COEYDALIS. 



Alae venulis transversalibus plurimis. Antennae maris simplices vel 

 denticulatae. Mandibulae maris elougata? vel breves. Capitis 

 augulis posticis dente acuto instructis. Forma valde robusta. 

 Celor plus miuusve fuseescens. 



Neuromus. 



Ala; venulis transversalibus plurimis. Antennae maris simplices. 

 Mandibulae J $ breves, sequales. Capitis angulis posticis dente 

 evidenter vel obsolete instructis. Forma minus robusta. Color 

 plus minusve pallidus. 



Chauliodes. 



Ala5 venulis transversalibus paucis. Antennae maris pectinatae, 

 foliacea;, serratae, vel simplices (interdum in foemina serratae). 

 Mtindibulae S $ breves, aequales. Capitis angulis posticis iner- 

 mibus. 



In Neuromus, N. grandis and N. infectus approach more 

 nearly to Chauliodes, as they want the tooth on the hinder 

 angles of the head ; yet they possess the numerous transverse 

 nervules and the general appearance of N. testacea. The spe- 

 cies of this genus much resemble each other, even to the fre- 

 quent presence of a black line, or spots, on each side of the 

 thorax. 



1 conclude this paper by noticing some synonymic correc- 

 tions, by describing some new species, and by giving a list of 

 the s]K^cies 1 propose to ])lace under Chauliodes and Neuromus, 



