* unrecognised European Lycaena. 673 



as has yet to be gathered, we may summarise the following 

 points, of which the first four are very definite structural 

 ones, of distinction between thersites and icarus. 



1. Male appendages belong in thersites to genus Agriades. 

 Male appendages belong in icarus to genus Polyom- 



matus. 



2. Very marked differences in the female appendages. 



3. Forms of ordinary scales upper side of wings differ. 



4. Androconia have different forms and ribbing. 



5. Basal spots forewing always absent in thersites, rarely 



(ab. icarinus) in icarus. 



6. Advanced position of apical spot hindwing in thersites 



constant, rare in icarus. 



7. Different alignment of tornal spots forewing. 



The series of icarus from the Tutt collection, which had 

 been inaccessible for a couple of years, throws a good deal 

 of light on the distribution of thersites, and enables one to 

 recognise as referring to thersites a number of the locali- 

 ties noted under icariis ab. icarinus in Tutt's " British 

 Butterflies," vol. iv, p. 168 et seq. 



This circumstance illustrates the great value of Tutt's 

 practice of taking and preserving long series from as 

 many localities as possible, a practice which he always 

 endeavoured to impress on others as one that ought to be 

 adopted. 



The Tutt series contains specimens of thersites from all 

 the localities I have referred to above. In addition, there 

 are specimens of the spring brood from Digne in April. 

 These specimens are remarkably small and pale in coloration, 

 very like some small weakly coloured icarus. A specimen 

 from Draguignan in May is much smaller than var. centra, 

 but of average coloration. These appear to be the only 

 examples of the first brood. The other examples are 

 almost all taken in August : Via Mala, OUon, Santa Maria 

 (Miinster Thai), Barcelonnette, Stalden, Pfynwald, La 

 Batiaz, Alios (the last four localities $ $ only), Albarracin, 

 Tragacete (of my capturing), Fontainebleau (one specimen 

 only), Digne (a full-sized and normally coloured example), 

 Lans-le-Bourg, Susa. Trelex (near Lausanne) provided 

 some large specimens similar to var. centra. 



Specimens I have from other sources include Siena, 

 identical in general appearance and size with an icarus 



