NORTH AMERICAN ODONATA. 209 



The Calopterygiuse are most abundant in the Neotropical and Oriental prov- 

 inces, hut the most widely distributed genus is Calopteryx, which "is Palaearctic 

 and Nearctic. None of this subfamily are Polynesian. 



The Agriouinse are cosmopolitan ; the genera Lestes and Ischnura are world- 

 wide, Argia is of both Americas and the Kurile Islands, Agrion is Palaearctic, 

 Nearctic and Oriental, Pseudagrion and Disparoneura are of the Old World from 

 West Africa to Australia and Borneo, and the most widely distributed species is 

 Enallagma cyathigerum of the upper parts of Europe, Asia and North America. 



No Gomphiufe are Polynesian. Gomphus occurs throughout the northern 

 hemisphere. 



The Cordulegasterinse are Neotropical, Nearctic, Palaearctic and Oriental. 

 Cordulegaster ranges through the northern hemisphere. 



The Aeschninse and two genera thereof, Anaz and Aeschna, are cosmopolitan. 

 Gynacanthn is of the tropical and subtropical regions around the globe. 



The Cordulinse and Libellulinse are world-wide. Of the former Somatochlora 

 extends throughout the cooler parts of the northern hemisphere. Among the 

 latter are Pantala flavescens, the most widely distributed species of Odonata, being 

 found in America. Asia, Africa and the Pacific (see Part II); Orthetrum. of all 

 parts of the Old World, 0. sabina ranging from the Fijis to the Cameroons; Li- 

 bellula quadrimaculata and Diplax scotica of the upper parts of the northern 

 hemisphere ; and Crocothemis erythrsea of Southern Asia, Europe and Africa. 



GEOLOGICAL DISTRIBUTION. 



Fossil remains of Odonata have been found as far down as the 

 Lower Lias in Enghuid and Germany, although two fragments of 

 wings from the Devonian of New Brunswick and named by Scudder 

 Platephemera antiqua and Gerepheviera siviplex, really belong to the 

 Odonata according to Hagen (Bull. Mus. Comp. Zool. viii, pp. 276, 

 277). 



According to Kirby (35) the beds which have yielded them are in England the 

 Lower Lias of Strenshara, Binton and Cheltenham, the Upper Lias of Dutuble- 

 tou, the Purbeck of Swanage and the Vale of Wardour; in France the Eocene 

 of Provence and the Miocene of Auvergue; in Germany the Lower Lias of 

 Schambelen, the lithographic slates (Oolite) of Solenhofen, Eichstatt and Pap- 

 penheim. and the Miocene of Oeningen, Schossnitz, the Brown coal of Rott and 

 Sieblos, the amber of East Prussia; in Italy, the Eocene of Monte Bolca; in 

 Ooatia, the Ollgocene of Eadoboj ; in the United Slates the Eocene of the Green 

 River shales of Wyoming, and the Oligocene of Florissant and Roan Mountains, 

 Colorado; in Queensland, the Cretaceous. 



The Calopteryginje are represented in the lithographic slates by the living 

 genus Euphea and the extinct Isophlebia and Tarsophlebia. Of the Agrion inte are 

 the living genera Agrion (Solenhofen, Florissant, Amber, etc.), Megapodagriou 

 (Green River), Trichocnemis (Florissant), and Lesfes (Radaboj, Oeningen, Sieblos) 

 and the extinct Dysagrion (Green River), Lithagrion (Florissant) and Agrionidium 

 (English lower Purbeck). Belonging to the Gomphinse are the living Gomphus 

 (Vale of Wardour, Amber), Gomphoides (Dumbleton, AmberJ, Minus (Rott) 

 Uropetala (lithographic slate) and Petalura (id., Sieblos), and the extinct Prnto- 

 lindenia, !?tenophlebia, Cymatophlebia (all lithographic stone), Heterophlebia {English 



TEANS. AM. ENT. SOC. XX. (27) AUGUST. 1893. 



