314 BRITISH LEPIDOPTERA. 



Vosges, Niederwald (Peyerimhoff), Burgundy (Constant coll.), Munich (Hartmann). 

 Italy: Lombardy — Brianza (Turati). Boumania : Slanic (Caradja). Bussla : 

 Wolmar (Lutzau), Baltic Provinces, Schlock, Dubbeln (Teich). Scandinavia: Nor- 

 way, Christiania (Esmark), Aker, Asker (Sparre-Schneider). Spain : Teruel (Zapater 

 and Korb), Bogatell, Saragossa, Barcelona, San Gervasio, Sarria, San Genis, Coll 

 (Cuni y Martorell). Switzerland: Locarno, Fusio (Chapman), Bergiin (Zell. coll.). 



Masonia mitfordella,* Chapman. 



Original description. — These look very like ordinary nitidella, but 

 have 19 joints to the antennae, usually only present in larger forms, 

 and, what is more distinctive and important, the length of the tibial 

 spur approaches that of crassiorella, viz., -70. The female (in Clark's 

 collection) with these specimens, is of the casta not the crassiorella type. 

 This form may be provisionally called var. mitfordella [Chapman, Proc. 

 Ent. Soc. London, 1899, p. xxvi (1900)] . 



Note on M. mitfordella. — The specimens on which this species 

 is founded are in the collections of Mr. Clark (2) and Dr. 

 Mason (3). All these were collected by Mr. K. Mitford, those in Mr. 

 Clark's collection having been labelled by Mitford, " n. sp.," but 

 without indication of where he obtained the specimens or on what 

 ground he considered them to be new and distinct. The specimens are 

 faded and not in the finest condition. In general aspect they are very 

 like the small (nitidella) form of F. casta with an expanse of about 

 11mm. The form of the wing seems to differ a little from typical 

 F. casta, the base of the inner margin being much less produced in a 

 rounded curve, the base of the wing being consequently narrow and the 

 costa and inner margin are less nearly parallel, but diverge at a wider 

 angle. The antennae are 19- or 18-jointed (specimens not mounted) 

 and the length of the tibial spur is -70--71 (the lowest figure yet met 

 with in casta is -77). The wing form is so dependent on accidental 

 circumstances of setting that it is difficult to place much reliance on it. 

 These examples might be regarded as very small M. crassiorella if one 

 could assume a range of variation in the latter species so great as to 

 allow a race of 11mm. and at the same time allow the antennal joints 

 to diminish to 19 or 18 (Chapman, in litt., December 15th, 1899). 



Masonia HiBERNicELLAf, Chapman. 

 Original description. — M. hibernicella, in coll. Fletcher, expanse 

 14mm., 19 antennal joints, spur length *67, with very much the 

 aspect of a large F. casta, tips more rounded than in F. scotica, which 

 it otherwise a good deal resembles ; the colour is a brownish mouse 

 colour, with the nervures that reach the margin very distinctly darker 

 lined. This is a feature observed in many F. casta, and seems to be 

 due to a certain amount of depression at the nervures, resulting from 

 folding in drying making the scales there thicker (Chapman, in litt., 

 January 21st, 1900). 



Pal^arctic species of Masonia not yet recognised as British. 

 Masonia saxicolella, Bruand. — Original description. Psyche saxico- 

 lella, Bruand, " Cat. du Doubs," no. 1178. ? Comitellaev&Y. Envergure du male, 



* We suspect this is the species which Mitford exhibited at the meeting of the 

 Ent. Soc. of London, March 4th, 1861, and noted as : " Psyche, sp. ? Apparently 

 a very distinct species allied to P. roboricolella, but the wings more rounded as in 

 P. radiella " (Zoologist, 1861, p. 7453). 



f The specimens of this species are united with those of F. scotica in the Proc. 

 Ent. Soc. London, 1899, p. xxvi. 



