36 Mr. R. M'Lachlan on the Neuropterous Genus 



vanishes in some species, showing a good transition between 

 Corydalis and Chauliodes, 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 typical 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 Chaidiodes^ 

 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 : — 



Corydalis. 



Alse venulis transversalibus plurimis. Antennae maris simplices vel 

 denticulatse. Mandibulse maris elougatse vel breves. Capitis 

 angulis posticis dente acuto instructis. Porma valde robusta. 

 Color plus minusve fuscescens. 



Neuromus. 



Alae venulis transversalibus plurimis. Antennae maris simplices. 

 Mandibulse S $ breves, sequales. Capitis angulis posticis dente 

 evidenter vel obsolete instructis. Forma minus robusta. Color 

 plus minusve pallidus, 



Chauliodes. 



Alae venulis transversalibus paucis. Antennae maris pectinatae, 

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

 Mandibulae 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. 



I conclude this paper by noticing some synonymic correc- 

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

 the species I propose to place under Chauliodes and Neuromus. 



