THE CANADIAN ENTOMOLOGIST. 



47 



THE GENERA PIERIS, SCHRK., AND EUCHLOE, HB. 



BY J. W. TUTT, LONDON, ENGLAND. 



In the Ent. Am., 1889, pp. 33-34, is a note by Mr. T. D. A. 

 Cockerell, F. Z. S., " On the origin of the genus Antkocharis. Bdv., (= 

 Euchloc, Hb.)," and from his remarks on p. 34, it would appear that the 

 larva of Pieris protodice and that of Antkocharis ausonides are practically 

 identical, Mr. Cockerell's assumption being based on a letter received 

 from Mr. W. H. Edwards. I am not at all certain as to the characters of 

 the American species included in Antkocharis, or whether the American 

 Anthocharids are co-generic with our species placed in Euckloc, Hb. 

 Kirby separates the genera and includes our common British species, 

 cardamines, in Euck/oe, the American species in Antkockaris. I am 

 anxious to learn whether our species of Euckloe are co-generic with the 

 American species of Antkockaris. 



In spite of the similarity of the larva of Pieris to that of Antkockaris 

 as mentioned by Mr. Cockerell, an unfailing (I believe) point of distinc- 

 tion occurs between Pieris and Euckloe, the larva of the latter having 

 distinctly 7 subsegraents to each segment, the larva of Pieris but 6. But 

 a still more constant character exists in the neuration. In Pieris, the 

 neuration (Fig. 2) is as follows: — 



i.e. — Nervure 3 is absent, as also is 9, 

 but 8 gives off a small branch at 

 apex — 8a. Pieris brassicce, rapce, 

 napi, callidice, dapklidice and bellidice 

 are identical in this respect. 

 But EucJiloc 

 Fig. 2. has a different 



type (Fig 3). It is as follows :■ — 



By comparing the diagrams above it 

 will be noticed that in Euckloe, 7 starts on 

 8 much nearer the discoidal cell than in Pieris. 

 8a, is much larger in Euckloe, and 9 is an 

 extra nervure in Euckloe not found in Pieris ; 10 starts nearer the end of 

 the cell in Pieris than Euckloe; whilst 6 is nearer to the base of 7 in 

 Pieris. 



Our Aporia is like Pieris, except that 7 starts nearly from the base of 

 8 (near the apex of cell), as in Euckloe, whilst 8a also is arranged as in 

 Euckloe \ 9 is absent as in Pieris. 



Fig. 3. 



