Some Palaearctic species of Cordulegaster. 289 



9. Similar (single example somewhat discoloured). Posterior 

 dorsal spot of 2nd segment isolated (almost as in fig. 12) ; yellow on 

 segments 2, 3 and 4 occupying more than J of each segment, on 5, 6 

 and 7 about h, 8 black (discoloured ?), 9 and 10 mostly yellow, dor- 

 sum of 9 broadly marked with black, 10 with two irregular elongate 

 blackish markings broad at the base and becoming lighter towards 

 the hind margin where they terminate in a definite black dot. Costa 

 yellow externally in both sexes. Antenodals : ^, forewings 13-16; 

 hindwings, 10-12; ?, forewings, 14-15; hind wings, 11. 



The dorsal marking on 2nd segment in fig. 12 represents an extreme 

 form ; it is usually more oval in outline but frequently showing little 

 wing-like lateral projections. The dorsal markings generally show 

 some variability in their extent in different specimens. 



7 c^cJ, 1 ?, Kokand, Fergana. 



J am unable to give serviceable figures of the appendages 

 of the various species, but think the diagrams showing the 

 distribution of the black and yellow markings on the abdo- 

 men may be of use. These are not drawn to scale, but the 

 measurements of the abdomen are given for each species. 



Other species of the genus have been noticed from the 

 more eastern parts of the region, but of these I possess no 

 material. 



It may be well to explain the difference in the references 

 here given to the pages of the Monographic des Gomphines 

 when compared with those given in Kirby's Catalogue. 

 Mr. Kirby and other authors, including de Selys himself, 

 appear to have made use of " separates " of the Mono- 

 graphic. There fall to be added to Kirby's figures, 260 

 pages, to make them correspond with those here quoted. 

 The inaccuracy of the date quoted by Kirby has already 

 been pointed out by Calvert (Biol. Centr.-Amer., Neuropt., 

 Odonata, p. 148, 1905). De Selys himself, however, had 

 already stated in the introduction to the Additions au 

 Synopsis des Gomphines (Bull, de I'Academie Royale de 

 Belgique (2), vii. 1859) that the Monographic was only 

 published in 1858. 



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



