4 BULLETLX OF THE 



chance, because it would have less inclination to attempt to leave the 

 drift wood or what-not, which kept it above the waters, and thus the 

 exceptional proportion of subapterous forms may readily be explained. 



At the same time, there can be little reason to question that a few of 

 the species may be supposed to have reached the islands by fUght. One 

 of tliem, the Sphingonotus, is strong-winged, and is said by Stal to occur 

 also in the island of Puna in the Uay of Guayaquil ; this genus contains 

 species wliich are among tlie exceedingly few Orthoptera believed to be 

 common to the Old and New Worlds. Two others fiill in the same 

 restricted genus, Schistocerca, to which belongs S. 2)<^'>'<'[/'>'i>i(i Oliv., a 

 species which has with little doubt crossed the Atlantic from South 

 America to Africa, being found on both continents and being the only 

 species of this numerous genus which has been found outside of America. 

 Moreover, Walker — not the best authority, it is true — identifies speci- 

 mens in the British Museum from the west coast of South America with 

 ^^. menalocera from the Galapagos ; and I have in my collection a new 

 species of Schistocerca, the largest known to me,* which was taken at 

 sea two hundred miles off the west coast of South America, or nearly 

 half-way to the Galapagos. 



* As tliis seems a fitting occasion, I append a description of the species, which 

 will doubtless be found at home on the west coast of South America. 



Schistocerca exsul, sp. nov. A species of tlie largest size, larger than any other 

 tliat I have seen, allied to -b'. americuna. Frontal costa of head very broad, nar- 

 rowed slightly at summit, where it scarcely equals the width of tlie vertex between 

 the eyes. Prozona of thorax compressed somewhat, but equally, the dorsum tec- 

 tiform and slightly carinate ; metazona very obtusely angulate behind. Anal area of 

 the tegmina narrow, slightly narrower tlian tiie costal. Prosternal spine erect, com- 

 pressed, the anterior face arcuate, the posterior straight, giving it a retrorse appear- 

 ance. Head pale cinereous, the lower half obscurely infuscate, the frontal costa 

 laterally infuscate above and the vertex marked irregularl}- with fuscous. Thorax 

 blackish fuscous on the subrugose prozona, the lateral lobes more or less embrowned 

 below, with an upper broad and lower slender pallid vitta ; metazona punctate, 

 fusco-castaneous, the dorsum anteriorly streaked longtitudinally with fuscous. 

 Tegmina cinereous, sparsely and irregularly maculate with fuscous on the basal half 

 in the vicinity of the principal veins, and on the apical half marked with blackish 

 fuscous linear dashes upon the nervules, ranged in irregularly parallel obliquely 

 transverse series, diminishing in importance outwardly. Wings hyaline with black 

 veins becoming luteous toward the base in the anal area, giving this a slightly 

 flavescent tone ; a few subajiical cells are infumateil. Hind femora pallid cinereous, 

 above feebly trifasciate with obscure fuscous , hind tibial spines yellow at base, red 

 mesially, black apically. 



Length of body GG nun ; tegmina 77 mm.; hind femora 35 mm One female, 

 taken two hundred and fifty miles off the west coast of South America. 



