MUSEUM OF COMPARATIVE ZOOLOGY. 13 



The specimens from Charles Island, most numerous in the collections, aver- 

 age a little smaller than those previously mentioned, but agree on the whole 

 better with them than with those from any other island. The maculation of the 

 tegmina, however, is still less conspicuous than in the specimens from Inde- 

 fatigable Island, least so of all the Galapagos specimens ; Albemarle specimens 

 approach them in this particular most closely, and indeed very closely, but the 

 ground color of the Charles Island specimens is usually darker, owing to a 

 generally deeper and broader infuscation of the principal veins and their 

 branches, like that common in the specimens from Indefatigable Island. The 

 contrast between the lighter metazona and the darker prozona is only rarely as 

 marked as in the specimens from Indefatigable Island, from which they further 

 differ uniformly in the possession of the bright quadrate patch on the upper 

 portion of the lateral lobes on the prozona. The infumation of the humeral 

 and axillary areas of the hind wings is almost confined to the apical half and is 

 there on the whole not so deep as in the Indefatigable Island specimens, while 

 the principal rays of the anal area are rarely conspicuous, and, apart from the 

 veins, the apical half of the anal area is rarely, and then but very faintly, 

 infu mated. 



The Albemarle type may next be mentioned. The average specimens from 

 that island are distinctly smaller than those already mentioned, though the 

 largest are larger than the smallest (in each sex) on both Indefatigable and 

 Charles Islands, and the smallest are among the smallest found anywhere. 

 The maculation of the elytra is more subdued than in specimens from any of 

 the islands excepting Charles, though this feature shows not a little varia- 

 tion, and, while distinct enough in some, in others is very feeble indeed ; the 

 general infuscation of the ground due to the obscurity of the veins is less in 

 specimens from this island than in those of any other but Duncan Island, for 

 the reticulation of the proximal half of the tegmina is almost entirely light 

 colored ; occasional specimens however are almost as dark as the average from 

 Indefatigable Island. In the bipartite coloring of the pronotum and in the 

 quadrate patch, the specimens from this island agree wholly with those from 

 Charles Island, varying to just about the same degree. As to the wings, any 

 infumation which exists — and it is sometimes entirely absent from the veins 

 — is altogether confined to the apical half of the humeral and axillary areas 

 and to the extreme border of the upper half of the anal area, while the thick- 

 ened costal margin is generally completely luteous, with but slight infuscation 

 except at the tip; while in the forms from the previously considered islands it 

 is generally infuscated throughout, sometimes to a considerable degree. 



Duncan Island, better than any of the other islands, possesses a type which 

 might perhaps be regarded as a race, and since the specimen before mentioned 

 as credited to Indefatigable Island agrees completely (with a single slight de- 

 parture which will be noted) it is considered here. The most striking feature 

 in the specimens is the decided and clearly delimited maculation of the teg- 

 mina, — in reality only an exaggeration of that found in specimens from all the 



