472 



PROCEEDINGS OF THE ACADEMY OF 



[Oct. 



Mexico, Guatemala and Costa Rica, respectively. In each table the 

 States or Departments are arranged in vertical columns corresponding 

 to their position on the Atlantic or Pacific slopes, and in the case of 

 Mexico also on the Central Plateau. In each vertical column the 

 names stand in order from north to south, and the States or Depart- 

 ments whose names are on the same horizontal line, in reading across 

 these tables, are, in part at least, in the same latitude. These three 

 tables exhibit the scantiness of our knowledge, however, rather than 

 actual differences in the faunas,^® 



Table 7. — Number of Species, etc., op Odonata Recorded from the 

 Departments of Guatemala, and op the Localities at 



WHICH they were COLLECTED. 



(See explanation in the text.) 



Pacific (Western) Slope. 



Atlantic (Eastern) Slope. 



Department. 



Locali- 

 ties. 



Spe- 

 cies, 

 etc. 



Department. 



Locali- ?.P^" 



ties. "f ' 

 etc. 



San Marcos 



Quezaltenango 



Retalhuleu 



Suchitepequez 



Solola 



Sacatepequez 



Amatitlan 



Escuintla 



Santa Rosa 



Totals (after deducting 

 duplications) 



20 



|Alta Vera Paz 14 



Izabal 9 



JBaja Vera Paz 6 



Zacapa 2 



Guatemala 3 



Jalapa 1 



68 



Totals (after deducting 



duplications) 35 



139 



Common to Atlantic and Pacific slopes 56 species, etc. Subtracting 56 from 

 68 + 139 gives 151 species from definite localities in Guatemala, or 10 less than 

 the total (i61) credited to that country in Tables 2 and 5. For these ten species 

 definite localities are not known and hence they could not be included in Table 7. 

 A similar difference exists between Tables 8, 5 and 2. 



" The State of Vera Cruz, lying exclusively on the Atlantic slope, extending 

 through 5i degrees (17°-22° + ) of latitude and 18,000 ft. (5,487 m.) of altitude, 

 and having an area of 29,210 square miles (75,654 square kilometres), has 118 

 species of Odonata. The State of New Jersey, U. S. A., also bordering the 

 Atlantic, reaching from 39° to 41° 15' N. and to ISOO ft. (550 m.) in elevation, 

 and with an area of 7,815 square miles (20,241 square kilometres) possesses 111 

 species of Odonata. Both areas have been examined by a number of collectors 

 of these insects, and the results do not seem to favor the general belief in the 

 richness of tropical countries in Odonata. At least 9 species are common to the 

 two areas: Hetcerina americana, Argia translata, Ischnura ramburi, Anomala- 

 grion hastatum, Anax Junius, A. longipes, LibeUula auripennis (probably). Pan- 

 tola flavescens, Sijmpetrum corruphim. As far as I am aware no data have been 

 published showing a richer Odonate fauna in a limited period of time than that 

 of the vicinity of Kent, Ohio, where Messrs. Osburn and Hine took 57 species 

 between June 17 and 24 {Ohio State University Naturalist, I, pp. 13-15, 1900). 



