SCHISTOCERCA, SPHINGONOTUS AND HALMENUS 437 



Since Stal described S. fusco-irroratus from Puna Island and from 

 the Galapagos without naming a type locality, I shall restrict the name 

 fusco-irroratus to the Pudn individuals, and call the two Galapagos 

 species S. trinesiotis and S. tetranesiotis. This nomenclature 

 would, of course, not hold in case the Puna specimens should turn 

 out to be identical with any of the Galapagos races. 



DIAGNOSIS OF SpMngOnotuS RACES. 



The following are diagnostic descriptions of the races of Sphingo- 

 notus. Detailed descriptions follow on pages 439-447. 



Sphingonotus trinesiotis chathaniensis. — General color pale green- 

 ish clay-color. Gente of same color as rest of head but paler ; post- 

 ocular and lateral prozonal stripes present ; pale diverging stripes along 

 angles of metazona, tegminal maculations confined to sloping surfaces 

 of closed wings ; no dark vertical stripe on hind femur ; lower three 

 fourths of hind tibia dusky. 



From Chatham Island. 



Sphingonotus trinesiotis indefatigabilensis. — A very distinct race. 

 Genffi distinctly paler than rest of the head and of a slaty tone ; 

 post-ocular and lateral thoracic markings very distinct and strongly 

 resembling those of chathamensis ; pale diverging bands on angles of 

 metanotum present as in the Chatham race but less distinct ; a pale, 

 line along the angles of the closed tegmina ; maculations of the tegmina 

 confined to the sloping surfaces. 



Resembles the Chatham race in the bands of the head and thorax, 

 and the Albemarle race in the slaty coloration of the genae. 



From Indefatigable Island. 



Sphingo7totus trinesiotis albemarlensis. — Genae distinctly differ- 

 entiated from rest of head, being paler and having a slaty color ; tho- 

 racic markings as in the other two trinesiotic forms, but less distinct ; 

 tegminal maculations forming complete cross-bands as in the Charles 

 and Barrington races of 6". tetranesiotis. 



From Tagus Cove, Albemarle Island. 



Sphingonotus tetranesiotis charlesensis. — Head and thorax pale 

 rusty-brown, head paler than thorax, no bands on either; tegminal 

 maculations form complete cross-bars ; lower surface of hind femur 

 with a dusky longitudinal band. 



From Charles Island. 



Sphingonotus tetranesiotis barringtonensis . — Very similar to the 

 Charles form. Head and thorax uniform reddish-brown ; tegminal 

 maculations forming complete cross-bands ; lower thi-ee fourths of 



Proc. Wash. Acad. Sci., August, 1902. 



