1895.1 139 



$ Orthezia we have here (I enclose eppcimens of both sexes). I have bred these 

 males from colonies of the Orthezia, and have observed them in all stages, from the 

 time of the larval form, when the two sexes were undistinguishable. The males 

 appeared in countless numbers last year in the Botanical Gardens here, hovering over 

 the bushes infested with the Orthezia. Previously only females occurred, so it is 

 probable that the male broods occur only periodically. 



" Dactt/lopius is a very common insect in plant-houses, and it seems probable 

 that the males of that Coccid may have been on the wing in the neighbourhood of 

 the Orthezia, $ ." 



The ? , according to Mr. Green's description and figure, and also 

 the specimens forwarded, being the same as my species, it seems to me 

 to be conclusive that he has found the true <^, and that the ^ I 

 described and figured has nothing to do with O. insignis. It is very 

 curious, however, that both in England and America a synchronous, 

 yet not cognate, ^ Coccid should have erroneously been placed in the 

 same position, and I am very glad the mistake has been found out. 



The synonymy will, therefore, be : — 



Orthezia insignis, $ , Doug., Green, Lounsb. 

 „ j> cJ > Green, nee Doug., Lounsb. 



153, Lowisham Eoad, S.E. : 



April loth, 1895. 



STENOPHYLAX CONCENTRICUS, AUCT. (nee ZETT.), RENAMED 

 .S. PERMISTUS. 



BY ROBERT McLACHLAN, F.R.S., <fec. 



The Trichopteron commonly known in collections as 8. concentricus 

 is an insect of large size, widely distributed, and familiar to most 

 students of Trichoptera, but nevertheless belonging to a group of 

 species having much external resemblance one to another, although in 

 some cases pertaining to distinct genera. As a consequence very great 

 confusion in nomenclature has resulted. 



When writing my " Monographic Revision and Synopsis," I gave 

 (p. 134) a long and complex list of synonyms and bibliography for the 

 insect now under consideration, due almost entirely to the existing 

 confusion, and stated that I adopted the only name {coiicentricus, Zett.) 

 which, according to an examination by the late Pastor AV^alleugren of 

 Zetterstedt's type, appeared to be free from objection ; it was hoped 

 the nomenclature was finally settled. But it would appear that the 

 unfortunate species is still without a name "free from objection." 



Dr. C. G. Thomson, the well known entomologist of Lund, in the 

 Museum of which town Zetterstedt's types are deposited, has stated 



