LEPIDOPTERA AT ALBARRACIN. 283 



the box, could be the cause of this change. I made an experi- 

 ment with other imagines, but unfortunately the same result did 

 not follow. All the same I am of the opinion that the vapour of 

 the benzine dissolved the yellow pigment of the paper, and 

 deposited it again on the fresh (i. e. recently caught) imagines. 

 Experiments with older examples failed, and they remained 

 white. The yellow examples are in my collection, and were 

 exhibited by me at a meeting of our Entomological Society. 



" Franz Bandermann, 



" Halle a/ Saale." 



It is, perhaps, possible that freshly emerged examples of 

 Pieridae may be tinted yellow by exposing them to the vapour of 

 benzine, the wing membranes containing certain fluids which are 

 not affected by this chemical when they have become hardened. 



LEPIDOPTERA AT ALBARRACIN IN MAY AND 

 JUNE, 1913. 



By W. G. Sheldon, F.E.S. 

 (Plate XII.) * 



Albarracin and its sierra are fairly well known to British 

 lepidopterists, several of whom have visited them during the past 

 twenty years ; but these visits have been made exclusively in 

 the months of July and August, when certain very local and 

 interesting butterflies are to be found in abundance, and so far 

 as I am aware no one has ever observed the spring and early 

 summer species occurring in this district. 



It was this fact that chiefly induced me to undertake an 

 expedition to this most picturesque of Spanish towns last spring. 

 A companion during a somewhat prolonged excursion of this 

 description is a very desirable adjunct, and I was fortunate in 

 persuading my friend Mr. A. H. Jones to accompany me, and all 

 who know the genial Treasurer of the Entomological Society will 

 realize the charm of his companionship and the value of his 

 assistance. 



Albarracin is totally unknown to the foreign tourist. 

 Baedeker does not mention it, and except during the months of 

 August and September, when the inhabitants of Valencia and 

 Saragossa visit the sierra in some numbers, attracted by its com- 

 parative coolness and by the curing mineral springs which are 

 found in certain parts, the district is left to those who dwell there 

 permanently. 



There are nowadays numbers of books written in English on 



* Plate xii. will appear with the November instalment. 



