1908. 



NATURAL SCIENCES OF THILADELPHIA. 



485 



Table 11.— Distribution of the Species, etc., op Odonata of Mexico 

 AND Central America by Slopes and (in Mexico) 



THE Central Plateau. 

 Atlantic, P = Pacific, slope;" C = Central Mexican plateau.) 



(A 



11 species are now recorded, for Acapulco 19. In Pacific Guatemala 

 the highest number recorded for one locality is 26 at Santa Lucia, 

 which is exceeded at various stations on the Atlantic slope, but this 

 latter has received much more attention from the collectors whose 

 material is accessible. 



Generally we may conclude that the hot moist areas of Mexico and 

 Central America are tenanted by the greatest number of forms of 

 Odonata, present information pointing to the richest areas as lying 

 in temperature zone III and the higher parts of zone II, on the Atlantic 

 slope, from the centre of the State of Vera Cruz southward, these 

 areas having a heavy annual rainfall. 



In this connection may be mentioned the suggestion of a possible 



3' The terms "Atlantic" and "Pacific slopes" are here used in the wide sense 

 as embracing : (a) in Mexico all the descending lands from the outUnes of tfie 

 plateau, as sho^Ti on our map (Plate XXVI), to the Gulf of Mexico on the one side 

 and to the Pacific Ocean and Gulf of Cahfornia on the other; (6) m Mexico 

 south of the plateau and in Central America, as corresponding to the Atlantic 

 and Pacific drainage areas respectively. 



