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X. Some Palaearctic species of Cordulegaster. By 

 Kenneth J. Morton, F.E.S. 



[Read May 5th, 19] 5.] 



Plates XXXIV-XXXVII. 



During recent years a considerable number of examples 

 of the genus Cordulegaster have come into my hands from 

 different localities in the Palaearctic region, amongst them 

 some which I have not been able to identify satisfactorily 

 with existing descriptions. 



The high standard of excellence in descriptive work 

 reached in the Monographic des Gomphines (de Selys with 

 Hagen's collaboration, Mem. de la Soc. Roy. des Sciences de 

 Liege, Tome xi, pp. 257-720, 1858) does not appear to have 

 been maintained. De Selys' last revision of the species 

 of Cordulegaster found in Asia Minor and Europe is too brief 

 and general (Odonates de I'Asie Mineure, Ann. Soc. Ent. 

 Belg., xxxi, pp. 31-35), and does not leave the subject 

 beyond the need of further treatment. The following notes 

 may therefore be helpful as a small contribution to a better 

 knowledge of these splendid insects. 



The material dealt with (in addition to ample series of 

 C. annidatus collected in Great Britain mostly by myself, 

 but also including series given to me by the Hon. Mr. Roths- 

 child from Devonshire, Mr. Mosely and others) has been 

 received from various sources : France (Morton), Spain 

 (Dr. Chapman, Miss Fountaine, Morton), Switzerland (Dr. 

 Ris), Herzegovina (Miss Fountaine), Constantinople (Mr. 

 Graves), Algeria ( Miss Fountaine), the Caucasus (M. Bar- 

 tenef), Amasia and Van, Asia Minor (Prof. Manissadjian), 

 and lastly, from Messrs. Staudinger and Bang-Haas, 

 Dresden, some very interesting insects from the Caucasus 

 and Fergana. 



The species referred to may be divided into two groups — 



I. Superior appendages of (^ with only one visible tooth : group of 

 C. annulatus. 



II. Superior appendages of ^ with two teeth : group of C. biden- 

 tatus. 



TRANS. ENT. SOC. LOND. 1915. — PARTS III, IV. (jUNE.) T 



