212 • [August. 



PASTOR WALLENGREN'S CLASSIFICATION OF SCANDINAVIAN 



TRICHOPTERA. 



BY ROBERT McLACHLAN, F.R.S., &c. 



An annotated List of Scandinavian Trichoptera, by my old and 

 nnicb-valued correspondent, Pastor Wallengren, has been in course of 

 publication in the " Entomologisk Tidskrift " since 18S0, and bas just 

 been completed. The first part appeared in Vol. i, pp. 64—75 (1880), 

 and included the PhryganeidcB ; the second in Vol. v, pp. 115 — 129 

 (1884), enumerated the Limnophilid(S, Apa'taniidce, and Sericostomatidce . 

 This was followed in Vol. vii, pp. 73 — 80 (1886), by a special paper on 

 the newly-erected Family ApataniidcB. The concluding part is in 

 Vol. si, pp. 1 — 10 (1890), and includes the "^quijjnlpina.'" 



The sequence followed throughout is practically that of my 

 "Revision and S3mopsis." But Pastor Wallengren in all his entomo- 

 logical writings has always showed distinct independence and originality 

 —traits observable in this List, — and as his work is perhaps not ac- 

 cessible to all our readers, I think it may be useful to give a brief 

 analysis. About 160 species are given as Scandinavian. 



As he has taken my " Revision " as a basis, I proceed to remark 

 on the deviations : — 



Firstly, as to Far.ilies The Phryganeid<s remain intact. The 

 LimnopliiJidcp are split into LimiiojMlidcB and ApataniidcB. The Seri- 

 cosfomatidip remain undivided. The LeptoceridcB are divided into 

 Molannidce, LeptoceridcB, and BercsidcB. The Hydropsy chides into 

 Hy dropsy cJi idee, Philopotamidce, and Psycliomidce Pliyacoplnlidce and 

 HydroptilidcB are undivided. No special Family characters are given, 

 save for ApataniidcB, and AVallengren has evidently largely acted on 

 my often repeated suggestions that several of my " Sections " would, 

 no doubt, hereafter be elevated to the rank of Families. I hesitated 

 to take the bolder course, until more had been published on the 

 Trichoptera as a whole. In all his writings, Pastor Wallengren relies 

 largely ou neuration, and, on this point especially, I am rather sur- 

 prised (but not sorry) to find the Sericostomatidcs remaining intact. 



Secondly, as to Genera. The chief divergences from my own 

 plan are in the Phryyaneidce, w'here we find Neuronia subdivided into 

 Neuronia, Oiigostomis, and HoJostomis (all old terms wdth somewhat 

 new applications), and Phryganea into Phryganea, Dasystegin, and 

 Trichostegin (to which almost the same remark applies) ; these changes 

 were commented upon, and to some extent adopted, in my " First 

 Additional Supplement " (1884). The only other generic change is 

 in Apatania, in which the original name is retained for A. WaUengreni 



