D1SC0GL0SSUS. 131 



poral spot larger, and the inner metatarsal tubercle 

 smaller. But a male specimen from Algiers, collected 

 by Mr. Sclater, has the tympanum completely con- 

 cealed ; and, on the other hand, the organ is perfectly 

 distinct in a male from Corunna and in another col- 

 lected by M. Bosca on the Sierra Morena ; whilst a 

 number of specimens from Europe and Africa are in- 

 termediate between the two extremes. I have now 

 before me a large number of living specimens from 

 Oram In some the tympanum is very apparent, whilst 

 in others its presence can hardly be detected. The 

 shape and extent of the dark temporal band and the 

 size of the metatarsal tubercle are subject to variation 

 in specimens from the same locality, and I have failed 

 to find any constancy in the other very trivial distinc- 

 tive characters pointed out by Heron-Royer. Dr. 

 Anderson, who has collected specimens in Algeria, 

 some of which show no trace of a tympanum exter- 

 nally, concurs with me in rejecting I). auritus even as 

 a local form. 



Specimens from Sardinia, Corsica, Montecristo, and 

 Giglio, it has been observed, never show the striped 

 form so frequent in Spain and Africa ; but neither do 

 the Maltese specimens, which are referred by Camerano 

 to J), j) ictus. 



Measurements (in millimetres). 



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