408 Dr. T. A. Chapman on Latiorina pyrenaica. 



very satisfactory examples of the larval skin. In the case 

 of the first one, whose condition was not recognised till 

 rather late, the cocoon of the parasite was so far advanced 

 as to show the zonal dark colouring described by Morley 

 (/. c). The one that emerged (No. 3) did so by gnawing 

 a hole in much the same way as the Rliogas did in the 

 case of eros, but instead of being at the posterior end 

 of the butterfly larva it is in front, quite to one side of 

 the middle line. In eros the dead larva is attached by the 

 head, in fyrenaica by the claspers. 



Though I did not desire to rear L. pyrenaica Avith the 

 object of strengthening its claim to be distinct from L. 

 orbituhis, since I considered that to be already abundantly 

 established, I was much interested to discover the points 

 in which they differed in their early stages, and in simple 

 fact found many items showing how distinct the two species 

 are. I have described the very great differences in the two 

 eggs, and in the first-stage larvae ; they are, as I have above 

 described, so different that, considering the trifling points 

 that distinguish many of the species of the Pohjominatus- 

 Agrindes group at this stage, one would, with only these 

 first-stage larvae before us, say that they probably belonged 

 to two quite distinct genera. The larva in the autumn in 

 2nd and 3rd instars is extremely dark and very difierent 

 from that of orbitidus at this stage. The young larva of 

 orhiiulus has much of the bright colouring of the full-grown 

 larva. This great divergence between the two species — 

 in the egg and in the structure and colour of the young 

 larva — is very remarkable, in view of the great similarity 

 of the full-grown larva, of the pupa and the imago. 



The colouring of the full-grown larvae is very close, but 

 certain areas in orhitulus are quite white, which are only 

 slightly paler than the ground-colour in jnjrenaica. Both 

 larvae are without honey-gland, and both feed on primu- 

 la ceous plants, though pyrennica will starve rather than eat 

 those species affected by orbitidus. 



Though the pupae are otherwise so much alike it is 

 remarkable that L. orbitidus has abundant anchor-ended 

 hooks of normal type over the cremastral area, whereas 

 L. pyrevaica is without hooks of any sort. 



