Introduction. 



The plate illustrating the characters of the wings has been 

 drawn for me by my friend Mr. C. H. Collinge, of London, from 

 the Swallow-tail butterfly, Papilio Machaon, L., which is the only 

 English butterfly that posesses typical neuration. The drawing is 

 twice the size of the original, so that the costal nervures and sub- 

 costal nervules may be easier made out ; and of the under side of 

 the wing, because on the upper aspect the precostal nervure {k) on 

 the hind wing in not visible; and for identification, the under side is 

 clearer. As every character has been verified under the microscope, 

 I feel this addition to the label list will be valued by the student. 



I have to thank Mr. Charles G. Clark, F.E.S., of London, and 

 Mr. S. L. Mosley, F.E.S., of Huddersfield, for their general criticisms 

 on the doubtful types. From these, and personal and other observa- 

 tions the few remarks below on the distribution, have been drawn 

 up ; they are of necessity very brief, but I think essential to the list. 



Papilio Fodalirius, L. Not British, no certainty it ever was. 

 Continental form, 



Parnassius Apollo, L. Probably introduced, no specimens taken 

 in Great Britain. Alps and Pyrenees. 



Pieris Napi, var. Sabellicce, Steph. A variety with black nervures, 

 and rare. Var. Napetz, Steph., a slightly larger form, no 

 characteristic value. 



Pieris Papcs, L. Commonest English butterfly. Vars. Metra, Steph. 

 and Mera, Steph. as variety names are worthless. Var. 

 NovanglicB, Scudd., kindly shewn me at the Natural History 

 Museum, South Kensington, by Mr. A. G. Butler, F.L.S., is 

 the yellow variety, which, though somewhat rare in Europe, 

 is very common in America. 



P. BrassiccB, var. Charidea, Steph. Is a small form, not separable 

 from type. 



Aporia Cratctgi, L. Now believed to be extinct. 

 Colias Hyale, L. In some years very rare. 



C. Edusa, Fabr. Common in 1877, rare since. Var. Helice, Hiibn. 

 is a white form of the female. 



