JUAN FIN AS— THE WATERFALLS 207 



wing, we were interested in the general similarity in color 

 pattern and in manner of flight shown by two widely dif- 

 ferent dragonflies — Epigomphus subobtusus and Brechmor- 

 hoga rapax crocosema — flying over the same brook. They 

 were of approximately equal size (two inches long), each 

 had the abdomen widened at or near the hind end, the 

 seventh segment thereof bore the most conspicuous pale 

 marking of the entire body (which was in general dark 

 brown with bluish or greenish stripes) and the eyes were 

 blue or bluish-green. Many differences in detail there 

 were but the general resemblance was of the kind that has 

 been called mimicry. There was nothing in this case, how- 

 ever, to suggest that the resemblance offered a means of 

 defense to either species against enemies. 



As we ate lunch on the steps of the unoccupied Hacienda 

 Maria, we watched a lizard, nearly a foot long, hunting in- 

 sects on the ground below us. Occasionally he would cau- 

 tiously approach a blue dragonfly {Argia extranea) several 

 of which were here and there on the ground, but unsuccess- 

 fully as far as we saw. There were two lines of leaf-cutting 

 ants crossing the range of the lizard's activities but these he 

 did not molest. Finally we saw him with a fat cricket or 

 katydid in his jaws, nearly choking him, but needless to say 

 it eventually disappeared down his throat. 



On February 14, 1910, P. went again to Quebrada Honda. 

 Insects of all kinds were scarce, especially dragonflies and 

 butterflies. The exception was Rhipipteryx biolleyi, plenti- 

 ful at the waterfalls and often along the tracks, and a few 

 of the black species {R. limbata) were also in evidence. 

 Leaf-cutting ants were at work again where we had seen 

 their paths on previous visits. Water was standing in the 

 ditches at the sides of the roadbed and flowing in the small 

 streams. The vegetation on the hillsides was everywhere 

 green, in striking and well-known contrast to the condi- 



