ODONATA OF BAJA CALIFORNIA. 485 



cent, of the females vary in both front wings to such an 

 extent as would place them in de Selys' first section and 

 therefore outside of Erythragrion. The comparison with 

 Pyrrhosoma is interesting from this consideration; 

 Pyrrhosoma belongs to the first section, but it seems 

 extremely doubtful whether there is any character which 

 can be used to separate it generically from Erythragrion 

 other than the one drawn from the point of separation of 

 the postcostal vein. Now that the well-marked tendency 

 in E. salviuu towards the Pyrrhosoma character is 

 known, can Erythragrion be maintained as a distinct 

 genus or " subgenus " ? 



Enallagma Charpentier. 



Charp. Lib. Eur. p. 21, 1840. Selys, Bull. Ac. Belg. (2) xli, p. 496, 



1876. 

 Calvert, Trans. Am. Ent. Soc. xx, p. 221, 1893. 



8. Enallagma ccecum Hagen. PI. xv, fig. 8. 



Agrion c. Hageu, Syn.Neur. N. A. p. 84, 1861. E. c. Selys, I. c. p. 



528, 1876. 

 14 3 2$Sau Jose del Cabo, not dated. 

 1 1 San Jose del Cabo, Sept., 1893, G. Eisen. 

 5 1 San Jose del Cabo, Oct., 1893, G. Eisen. 



1 San Jose del Cabo, Sept., 1894, Eisen & Vaslit. 



20 i 5 ? 

 Differ from Selys' description (/. c.) as follows: $ Only 

 a small black spot at upper end of second lateral thoracic 

 suture, no ventral thoracic, bronze spot " pres de I'abdo- 

 men," black on 2 having the form of three sides of a 

 square or of a U (similar to the black spot on the same 

 segment of the European Agrion -piiella) ; a variable 

 amount of black on the apex of 8, sometimes occupy- 

 ing as much as the apical third, with a complete 

 transverse band uniting with the black of either side; 

 the small internal tooth on the superior appendages is 

 only a little beyond the middle, instead of at three- 



