TURRIALBA AND PERALTA 249 



green or, when mature, rich brown, and six to eight inches 

 long. 



On October 2, A, and P. revisited Turrialba and these 

 potreros, when we had a good view of one of the grotesque 

 basilisk lizards. This particular basilisk was on the ground, 

 but on our approach ran ten or twelve feet up a tree and re- 

 mained on the far side even when we walked around the tree. 

 Its body was bright grass green, except that the tail was cross- 

 barred with black. The lizard remained quiet as long as we 

 stood still, but a cautious move preparatory to photograph- 

 ing it caused it to dart instantly to the opposite side of a 

 branch over which it peeped at us warily. 



On July 27 Professor Tristan and P. walked northeastward 

 along the railroad track, crossing the Rio Turrialba and the 

 Rio Aquiares by the railroad bridges, until we came to a 

 third bridge over the Rio Azul. All three rivers lie in gorges 

 more than fifty feet below the general level of the country 

 and in places the sides of these gorges are steep, in others 

 more gradual. The Rio Azul is much less rocky than the 

 Rio Turrialba, the vegetation reached to the water's edge 

 and the scene was much prettier. We turned to the right 

 into a charral and across it into the woods which immediately 

 border the stream, but there was not a great variety of ani- 

 mals of the groups in which we were interested. Among 

 other things we looked for fresh-water planarians but found 

 only three, representing possibly two species, one with little 

 earlike lobes on the head. 



On the morning of July 25 we walked in a general easterly 

 direction from Turrialba along a road which led to the Rio 

 Reventazon and across it to San Francisco de Tuis, but did 

 not go as far as the river. We passed a field of yuca; most 

 of the way the road ran through pasture land but finally 

 entered forest, into which we turned aside for a short dis- 

 tance. We saw three snakes this morning, more than we 



