ODONATA OF BAJA CALIFORNIA. 555 



en forme de pH " on each side of the vulvar lamina not 

 distinguishable, perhaps owing to the compression of the 

 apical half of the abdomen. Abdomen 58, hind wing 53. 

 This species has hitherto only been known from China 

 and Japan; its occurrence in California, should the local- 

 ity be correct, is very interesting. There seems to be no 

 doubt of its being this species, the correspondence with 

 the descriptions is so exact and the differences above 

 given are not of specific value. . 



EXPLANATION OF PLATES. 



Plate XV. 



Pig. 1. Ischnura? erratica n. sp., right side 10th segment and append- 

 ages S . 



Fig. 2. Isch. exstriata S n. sp. id. 



Fig. 3. /. cervula SelyS(? id. 



Fig. 4. /. perparva Selys <J id. 



Figs. 5-6. /. Ramburii Selys, var. crediila Hag. 5 . 6 as above, 5 dorsal 

 view of right superior appendage; ex onter, in inner branch. 



Fig. 7. Enallagma Eiseni n. sp. 5 ., right side of 10th segment and ap- 

 pendages. 



Fig. 8. Enal. coecum Hag. <^ id. 



Fig. 9. Erythragrion salvum Hag. 5 id. 



Figs. 10-11. Archilestes grandis Eamb. 10, dorsal view of appendages of 

 i ; 11, left side last two segments and genital valvules vg. of$. 

 There is considerable variation in the form of the ajipendages from 

 that shown in fig. 10 as regards the proportionallength of the thick- 

 ened parts and the abruptness or gradual curving of their outline, 

 biit these variations are connected by iutergrades and are not of 

 specific value. 



Fig. 12. Argia cuprea Hag. .^ oblique profile view from behind of left su- 

 perior and inferior appendages. 



Fig. 13. Argia vivida Selys 6 id. 



Fig. 14. Argia agrioides n. sp. $ id. 



Figs. 15-16. Anax Junius Drury S . 15, dorsal view, 16, right side of 10th 

 abdominal segment and appendages. 



Figs. 17-18. Anax Walsinghami McLach. S id. 



Figs. 19-20. yEschna californica n. sp. i id. 



Figs. 21-22. Argia amea Selys i . 21, dorsal view of left superior ap^jeud- 

 age; 22, oblique profile view from behind of left superior and infe- 

 rior appendages (more highly magnified than 21). 



