422 [November, 



and in three of the specimens the general appearance is the same, save 

 that the spines of the legs are darker, almost blackish in certain lights. 

 But one J 1 is an extraordinary melanic colour-variety. In this the 

 anterior-wings may be described as black, with black neuration ; the 

 costal margin (costal and sub-costal areas) is whitish as far as the 

 pterostigmatic region ; there is a small, oblique, whitish, fenestrated 

 spot, and an irregular, whitish, anastomosal space divided into six or 

 seven spots by the dark veins of the anastomosis ; furthermore, there 

 are a number of minute whitish dots scattered over the dark ground. 

 In the posterior-wings the neuration is black, and the line on the 4th 

 apical sector is deep black. I now think it highly probable that 

 Zetterstedt's interrogationis from Greenland was founded on a some- 

 what similar melanic form. 



N.B. — Hagen (Yerhand. zool.-bot. Wien, 1873, p. 449) indicates a species from 

 Iceland (without name), in the Berlin Museum, allied to G. nitidus, Mull., but 

 smaller. Brauer (Neurop. Europ., 1876) gives Iceland, doubtfully, as a locality for 

 nitidus. 



Limnophilus picturatus, McLach. Krisuvik, 4^,1 $ , Hengill Moun- 

 tain, 1100 ft., 1 ? . 

 The species was founded by me (Revis. and Synop., p. 78) on the 

 $ only, from northern Europe. Subsequently the £ , from Iceland 

 (Standing er), was described by me as L. exulans (Suppl., p. vi). 

 Eventually it was found that both were the sexes of one species 

 (Suppl., p. xxi), which has a wide range from Iceland over northern 

 Europe and Asia to the eastern Amur. Only one (that from Hengill) 

 of the Icelandic examples now before me in any way resembles the 

 highly-marked form of the ? from which jncturatus-waa first described. 



Limnophilus flffinis, Curtis. Reykjavik, 3 $ , 3 $ . 



The Icelandic examples quite resemble the common English form 

 of this wide-spread species. 



Limnophilus qriseus, L. Reykjavik, Krisuvik, and Hengill, 77 examples 

 in both sexes. 

 This is evidently the common Trichopteron of Iceland. The long 

 series naturally shows extreme variability both in size and colour. The 

 small common English pale form of the $ occurs in both sexes, chiefly 

 from Hengill and Krisuvik ; in these the wings have scarcely any 

 markings, except the dark pterostigma. A larger pale form is repre- 

 sented in quantity from Reykjavik, together with some specimens 

 approaching the highly-variegated form of the ? (rarely of <$) common 



