LIBELLULIDJ:. ANAX. 



81 



Ocellis 3.bus in linea transversa positis. 



Ocnlis supra contiguis: afirfomirae elongate cylindrico. 



^/is acuminatis ; stiff matibus e\onga,tis: . 10. Anax. 



obtufs; stiffmatibus oh\ox\^s : . • 11. ^shna. 



vix contiguis ; aMomine clavatis : .- . 12. Cordulegaster. 



remotis : 13. Gomphus. 



3-bus in triangulo sitis : 



Capite eithm-ace meiaWids: . . . .14. Cordulia. 



baud metallicis : . . . 15. 1L.ibejllula. 



Genus X. — ANAX, Leach. 



Labium with its middle lobe transverse, somewhat ovate-quadrate, tumid, 

 divided by a longitudinal impression into two parts, its apex deeply 

 emarginate ; lateral lobes not encircling the central one, furnished with a 

 moveable acuminated process, which rests on the upper edge of the inner 

 lobe : mandibles with long denticulations : lahrum slightly emarginate : head 

 semiglobose, its front very prominent, somewhat acute an 1 vesicular : ocelli 

 placed in a line upon a slight elevation : eyes contiguous : abdomen elongate- 

 cylindric, its basal segment tumid, third coarctate ; the apex of the male 

 with three appendages, the lower one truncate, of the female with two 

 lanceolated ones : wings long, slender, somewhat acute at the apex ; stigma 

 very long and narrow ; the hinder margin of the posterior pair rounded in 

 both sexes. 



Exclusively of slight variations in the trophi, &c. the only 

 indigenous species of this beautiful genus differs from Anax in that 

 both sexes have the hinder margin of the posterior wings rounded 

 within; the abdomen is not clavate, and its anal appendages are 

 long in both sexes. 



Sp. 1. formosa. Thorace azureo aut virescente immacvlaio, abdomine strigu 

 dorsali angulosa nigra, pedibus nigris, basi rufis. (Long. corp. 3 unc. 1 — 2 

 lin. ; Exp. Alar. 4 unc. — 4 unc. 2 lin.) 



JEshna formosa. Van. Linden 20. — An. Imperator. Steph. Catal. 268. 

 No. 3455. 



Head azure, luteous beneath, mouth fuscous ; eyes green, yellow behind ; 

 thorax immaculate azure or greenish, dorsal sutures blackish; space 

 between the wings azure, with black sutures ; abdomen with the basal 

 segment tumid, third attenuated, the first greenish, the remainder pale 

 azure, with the margins and a continuous irregular band reaching to the 

 apex black ; anal appendages fuscous, legs black, femora reddish at the 

 base; wings hyaline, costal nervures and a few of the transverse ones 

 yellowish, remainder black ; stigma o'ilong, fuscous. 



Female with the abdomen fuscous at th ebase, the hinder margin of the first 

 Mandibulata, Vol. VI., June 15th, 1836, l 



