54 Rio Agua Dulce April 7 At about 2.6 mi. SE there is a rather sudden change to good cliopensis dolutat with abundant lulls occupying every suitable area so that nigicaud- alus stops rather suddenly. (Must show similarity of habitat between nigicandatus cliopensis to prove this point.) In other words the two compete & nigicaudatu excluded from the Tonala' region completely although it is able to push through the Decilapa Valley, crossing the drier portions & reaching abundance in it along the several small rivers where there is evergreen vegetation (the probably important) but of a less rich & extensive sort suitable for good population of cliopensis. Nigicandatus perhaps is able to occupy smaller trees along the rivers than can cliopensis. There seems little doubt that cliopensis requires large tree - amotes or mangos - this is evident at the edge of its range where it occurs around farms almost exclusively: The fact that the two are similar in color & markings makes sense if they have similar habitat tolerances. - probably both adapted to broad-leaved evergreen situations where there is considerable shade thrown by the large leaves - in other words rather dark situations where large patches solid color would provide better concealment that a variegated flight pattern such as possessed by humilus.