436 SNODGRASS 



Variations (18 specimens). — In color the Abingdon specimens 

 differ decidedly from any others so far described in having the yellow 

 color of the head and thorax predominant over the black, and the red 

 of the posterior femora predominant over the black there. In many 

 there are distinct indications of black markings as in the type^ but 

 in others the color is a uniform dark reddish- or yellowish-brown 

 with scarcely any indication of yellow and black. There is no con- 

 trast at all between the prozona and the metazona. Those that have 

 the prozona darkest have a well-developed yellow spot at the angle of 

 the scutum on each side. The wings of the darkest specimens are 

 darker than the wings of those with pale colored bodies, but in all the 

 maculation of the fore wings is well marked and closely resembles the 

 maculation of the tegmina of the Duncan Island specimens, being in 

 most cases better marked than in the type figured. 



Length of tegmina of the Abingdon specimens, male^ 36, 36, 38, 

 37» 35 = 36-4 mm. ; female , 47, 47, 47, 48 = 47.25 mm. 



The Bindloe specimens differ in no way from those on Abingdon 

 and it is apparent that those from the two islands represent but a single 

 species. Although the specimens present numerous variations amongst 

 themselves yet they are as a whole distinctly separated from any other 

 race. 



Length of tegmina of the Bindloe specimens, niale^ 37, 35, 43, 37 = 

 38 mm. \ female^ 47, 50, 49, 50, 49 = 45 mm. 



From the above descriptions it is easily seen that the Abingdon- 

 Bindloe race certainly resembles most the intermediately-colored indi- 

 viduals on Duncan Island. 



Genus Sphingonotus. 



GENERAL REMARKS. 



This genus inhabits the central and southern islands of the archi- 

 pelago, being known only from Albemarle, Indefatigable, Barrington, 

 Chatham, Hood and Charles. Furthermore, it is for the most part, 

 found only in the dryer parts of these islands. For example, on 

 Albemarle it is present on the arid region about Tagus Cove, but is 

 absent in the humid district about Iguana Cove. 



The seven races, into which the Galapagos specimens may be sepa- 

 rated, form two groups that appear to constitute two closely related 

 species. One group inhabits Chatham, Albemarle and Indefatigable ; 

 the other inhabits Barrington, Hood, Charles and Indefatigable. The 

 occurrence of two races on Indefatigable may be regarded as evidence 

 of the presence of two species. 



