AGRION. 81 



external branch conical, straight, internal branch longer, flat; in- 

 ferior ones unguiculated, longer, oblique, recurved; wings hyaline; 

 pterostigma of the anterior ones black, exteriorly white ; of the 

 posterior wings luteous ; seven postcubital cross-nervules. 



Length 30 millim. Alar expanse 30 millim. 



Hab. Northern California. 



13. A. denticolle ! 



Agrion denticolle Burm. Handb. II, 819, 9. 



Black ; head anteriorly, and an occipital point each side, blue ; 

 margin of the prothorax straight, the middle lobe small, narrow, 

 rounded; dorsum of the thorax brassy-black (J"), or each side 

 with a blue stripe ( 9 ) ; sides blue, or with an anterior, superior 

 black spot (9); feet pale, femora and tibias partly black, or 

 lineated with black (9); abdomen (eight last segments of the 

 male destroyed) brassy-black, the sides and a basal ring upon 

 3 — 6 yellowish, 8 blue, 9 with a large dorsal spot, and the base 

 covered with blue; 10 dorsum medially elevated, plicated, yellow; 

 appendages short, yellow ; eighth segment with no ventral spine ; 

 wings hyaline ; pterostigma luteous ; anterior pterostigma of the 

 male black; ten postcubital cross-nervules. 



Length 27 millim. Alar expanse 30 millim. 



Hah. Moretia, Mexico (Saussure). 



14. A. demorsum ! 



Agrion demorsum Hagen ! 



Brassy-green ; head in front, and an occipital point, blue ; pos- 

 terior margin of the prothorax small, rounded ; dorsum of the 

 thorax brassy-green, each side of it a blue stripe ; sides blue ; feet 

 pale, exteriorly black ; abdomen brassy-green, the sides and a 

 basal annulus, on segments 3 — 6, yellowish, segments 8 — 9 blue ; 

 posterior margin of 10 with a narrow, elevated middle process, the 

 apex bifid; appendages short, superior ones fuscous, two-branched, 

 external branch conical, straight, the internal one longer, flat ; 

 inferior appendages yellow, broadly bifid, the branches spreading 

 apart, unguiculated, the apex black; the upper branch longer; 

 wings hyaline ; pterostigma luteous, anterior ones of the J" black, 

 exteriorly white ; 8 — 9 postcubital cross-nervules. (The abdo- 

 men of the female is partly destroyed.) 

 6 



