118 Mr. J. E. Collin on D'lptera from 



Circle; even from Spitsbergen alone some dozen supposed 

 species have been described or recorded by Bohemaii and 

 Holmgren. These early writers failed to describe the im- 

 portant chfetotactic characters by wliich the different species 

 may be best recognized, and this omission, coupled witli tiie 

 fact that specimens from the Arctic region are seldom brouglit 

 home in good condition, has been the cause of great confusion 

 in connection with the species concerned. 



In Kertesz's * Katalog ' the Spitsbergen species stand as 

 follows : — 



1. Limnophora denudata^ Holmgr., ^ ? . 



ranunculi, Holmgr.; $ . 



2. L, dorsata, Zett., (^ ? . 



lu/perborea, Boliera., ^ 2 • 

 labiosa, Boliem., $ . 

 megastoma, Boliem.^ p.p. 



3. L, fidig'inosaj Holmgr., (^ . 



4. jL. ^7/o^a, Holmgr., (^ . 



5. L. megastoma^ Bohem., c^ ? . 



ludihunda, HolmoT,, cT . 



triangulifera, Bobem. (1865), iiec Zett. 



P conspurcata, Holmgr., ,5 5 • 



6. L. 2jauxillaj Holmgr., ^ ? . 



7. L. vhticolUs, Zett., c? $ . 



Ringdahl, who has done much to clear up the Swedish 

 species of Limnophora, gives (after an examination of Zetter- 

 stedt's types) vitticollis, Zett., as a synonym of triangidifera, 

 Zett., but it is not certain that this applies to Holmgren's viU'i- 

 collis. More recently (1917) Lundbeck has varied the syno- 

 nymy of some of the Spitsbergen species by quoting denudata, 

 Holmgr., as a synonym of contractifrons^ Zett. & Stein, and 

 the above dorsata of" Holmgren (NOT of Zetterstedr) as a 

 synonym of triungidifera, Zett. & Stein, with paiuvilla, 

 Holmgr., and ranunculi^ Holmgr., as doubtful synonyms. I 

 very much doubt the correctness of this latter synonymy of 

 Lundbeck's. L. triangidifera, Zett., has clear wings, while 

 Holmgren's dorsata was described as having: — "Al?e... 

 costam versus prgesertim infuscatse, areis basalibus quibus- 

 dam et macula ad apicem nervi auxiliaris ut plurimum fuscis ; 

 nervo transverso ordinario umbra fusca, plus minusve 

 distincta."'' 



