412 SNODGRASS 



that it occurs also on the island of Puna near Guayaquil, 

 Ecuador. Likewise, only one species of Uahnenus, H, 

 robustus Scudder, has heretofore been recorded. The material 

 here reported on, however, shows that there are on the Gala- 

 pagos at least two species including seven races of Sphingo- 

 notus^ and three if not four species of Uahnenus. 



Genus Schistocerca. 



GENERAL REMARKS. 



Two Galapagos species of Schistocei'ca have been described, viz. 

 S. melaiiocera (Stal) and 6". literosa (Walker). In neither case is 

 it recorded from which island the type came, but all subsequent re- 

 searches have shown that 6". viela?zocera occurs on Charles, Barring- 

 ton, Indefatigable, Jervis, James, Albemarle and Narboro, and that 6". 

 literosa occurs on Chatham, Hood and Tower. Scudder reports that 

 one female of ^S. 7nelanocera was collected on Chatham by Baur, and 

 Butler accredits two specimens of 6*, literosa., collected by Darwin, to 

 Charles Island. It is doubtful, however, whether both forms ever 

 occur normally on the same island. It is well known that Darwin 

 did not always keep his specimens from the various islands well sep- 

 arated. We saw neither S. vielanocera on Chatham nor S. literosa 

 on Charles, but in each case found the other species very abundant. 



Both Wolf and Agassiz have stated that S. melanocera inhabits only 

 the higher parts of the islands and 6". literosa the lower. My own 

 observations are wholly at variance with these statements. In both 

 December and June S. ?ttelanocera was found in enormous numbers 

 along the very edge of the shore at Iguana Cove, Albemarle, and was 

 common up to i,ooo feet. Above this almost none were seen. The 

 same w^as true at Tagus Cove, Albemarle. The grasshoppers were 

 everywhere numerous on the low hills about the cove and at the base of 

 the mountain two miles inland. On the sides of this mountain they 

 were scarce, but a few were found all the way to the top, 4,000 feet. 

 On Charles Island during May the species was abundant close to the 

 shore at Black Beach, but was much less numerous in the upper parts 

 »of the island. Barrington is a low island, below 1,000 feet, and the 

 species on it was just as abundant near the shore as farther inland. 

 On Chatham S. literosa was common from the shore up to at least 

 1,500 feet. Hood Island has an elevation of only 650 feet, but the 

 grasshoppers were just as abundant in the higher parts as near the 

 shore. Tower Island is all low and flat. 



