GUANACASTE—PUNTARENAS TO LIBERIA 435 



were abundant in this road. They were chiefly of two spe- 

 cies, Osmilia tolteca and an Ahracris (or Omalotettix) . The 

 former was the more abundant; the males have the body 

 one inch long, the total length to the tips of the folded wings 

 being one and one-quarter inches, while the corresponding 

 figures for the females are one and one-quarter and one and 

 five-eighths inches. The general color is a pale ochre brown, 

 relieved by a rather conspicuous and relatively broad, dark 

 grayish-brown stripe extending lengthwise on the middle of 

 the outer surface of the thigh (or femur) of the third leg. 

 This stripe tapers to a point near the articulation of the fe- 

 mur with the tibia or shank; above and below this stripe 

 the edges of the femur are a pale reddish-yellow. The hind 

 wings are bluish- to greenish-yellow, paling toward the 

 edges. Osmilia is a very characteristic tropical American 

 grasshopper; we also have specimens of 0. tolteca from 

 localities so different in character from Guachipelin as Gua- 

 cimo and Peralta. 



The female of the Abracris, the only sex represented in our 

 collection, has almost the same dimensions as the male of 

 0. tolteca. It is likewise of an ochreous color, but the femur 

 of the third leg has two darker brown spots extending from 

 its upper edge halfway across its outer surface, dividing the 

 femur into approximately equal thirds. The hind wings are 

 almost colorless, very pale greenish at the base. The angle 

 formed in profile view by the front and upper surfaces of 

 the head is decidedly more oblique (less than a right angle) 

 than in 0. tolteca. 



In the afternoon we went to our ablution brook, which 

 unites with the Colorado, and while Professor Tristan went 

 downstream I went up. It was like the Rio Blanco in minia- 

 ture but its water was warmer because shallower and its 

 source was much lower down. Along its banks there were 

 many tree-ferns seven to eight feet high, which were very 



