ODONATA OF BAJA CALIFORNIA. 469 



Family 3. Libellulid^. Triangle of front wings with its long axis 

 at right angles to the length of the wing, triangle of hind wings 

 with its long axis coinciding with that of the wing. Anteciibitals of 

 first and second series mostly coincident. No postcubitals in the 

 nodal end of the second series. Lateral lobes of the labium of one 

 joint. Head globose, eyes meeting on the top of the head. Abdo- 

 men with lateral carina. Females without genital valves. 



Subfamily 6. GordulincB. Hind margin of eyes produced as a 

 small tubercle. Usually a small bundle of tine hairs on the 

 distal anterior surface of the first femora. Males with auricles 

 on 2, anal margin of hind wings excavated, distal end of first 

 tibias with an inferior carina. 

 Subfamily 7. Libellulhite. Hind margin of eyes not produced as 

 a small tubercle, or with a mere trace of such. Males without 

 auricles on 2, anal margin of hind wings not excavated. 



No Cordulegasterince or Cordulinge are known to in- 

 habit Baja California. 



Characters of the Genera (imagos only). 

 Subfamily Calopterygin^. 

 Legion Calopterijx Selys. Sectors of the arculus arising from below its 

 middle, autecubitals of first and second series nearly equal in number, 

 quadrilateral as long as the basilar space, pterostigma absent or of from 

 one to several cells. Epistoma not projecting as much as the length of 

 the eyes. 

 Basilar space cross-veined, arculus not broken, no inferior branch to 

 the lower sector of the triangle; 5 wings with a basal red spot, cells 

 of postcostal space on front wings irregular. HeUf.rina. 



Subfamily Agrionins;. 



I. Legion Lestes Selys. Median and subnodal sectors parting from the 

 principal sector much nearer the arculus than the nodus; <5 superior ap- 

 pendages forcipated. 



Nodal sector parting from the principal one and a half cells after the 

 nodus; supplementary sectors between the subnodal and the me- 

 dian, and the median and the short, and other sectors. 



Archilestes. 



II. Legion Agrion Selys. Median and subnodal sectors parting from the 

 principal sector near the nodus; quadrilateral trapezoidal, upper side 

 shorter than the lower, lower outer angle acute: no supplementary sec- 

 tors except the ultra-nodal; lower sector of the triangle extending to the 

 hind margin of the wing; pterostigma of but one cell. 



