230 H. A. HAGEN. 



Dr. Hagen, in the "Synopsis of the Odonata of America" (Proc. 

 Bost. Soc. Nat. Hist, xviii, pp. 20-96, 1875) referred elisa to Ce.li- 

 themis (as previously indicated by Walsh), and amanda and ornata to 

 Diplax. 



Mr. W. F. Kirby, in his " Revision of the Subfamily Libellulina" 

 (Trans. Zool. Soc. London, xii, part 9, pp. 249-348, pis. li-lvii, 1889), 

 places ' elisa, amanda and ornata in Celitheynis ; albifroiis, pectoralis, 

 dubia, ruhicunda, hudsonica and intacta in Leueorhinia, and caudalis 

 in Cmnotiata (Buch.) 



The genus Leueorhinia as here understood, is equivalent to the 

 combined genera Leueorhinia and Ceenotiata of Kirby, or to the 

 Lencorhinia of Brauer with the omission of the species elisa et seq.^ 



PI. X, fig. 8, shows the right hamulus of ijitoeto drawn from below, 

 the insect turned over. The whole part in the middle, m, is pale 

 membranaceous, and in ruhicunda is often inflated. The branch a 

 is movable, and is always entirely shut down when the penis is visible 

 between the two hamuli of the right and left sides. This arrange- 

 ment of the hamulus, which is indeed rather peculiar, is a character 

 of the genus Leueorhinia, and excludes the species put in by Dr. 

 Brauer {elisa etseq.). The anterior branch of the hamules, a, is 

 represented in d, as seen from the side, and is apparently very different. 



[Elisa, amanda and ornata differ from the other species also by 

 having the pterostigma proportionately longer and narrower; in 

 elisa and amanda the last antecubital (antenodal) of the forewings 

 is not continuous. 



The genus Jjeucorhinia thus defined comprises eleven known spe- 

 cies, viz. : 1. fr/ec^ra Miill. (caitcZaZ/s Charp.) 2. albifrons ^nvm. ; 3. 

 frigidaYlvL^.] 4. pectoralis Charp. ; 5. borealis Hag.; 6. rubicanda 

 Linn. ; 7. proxima fHag. MS.) Calvert ; 8. hudsonica Selys ; 9. dubia 

 Vander Linden ; 10. glacialis Hag. ; 11. intacta Hag.] 

 1. l.eucoi'liiiiia triedra Miiller. 



[Northern, Eastern and Central Europe. — Selys.*] 



I am convinced that for caudalis Charp. the name triedra Miiller 

 should be accepted. Li 1850, neither Baron de Selys nor I had 

 studied Miiller' s work thoroughly, and I at least did not know the 

 varieties of caudalis as well as in later times. Miiller' s description 

 (Nova Acta Nat. Curios., iii, p. 129) agrees entirely with all the 

 varieties and cannot be applied to any other species. The only ob- 



■•■ The geographical distribution of the European species is, according to Barou 

 de Selys- Longchamps' Odonates de I'Asie Mineure et Revision de ceu:c des autres 

 parties de la Faune dite Europeenne (Ann. Soc. Ent. Belg., xxxi, pp. 1-85, 1887), 

 p. 75.— P. P. C. 



