Zool.— Vol. I.] CALVERT— ODON ATA. 373 



Males. These have the superior appendages similar to those of specimens 

 from Texas in the collection of the Academy of Natural Sciences of Philadel- 

 phia, although not agreeing with Walsh's description of the form he named 

 H. texana, 1 since the "large laminiform medial tooth" does not appear 

 bilobate. 



The chief differences from the typical form of americana as described in 

 the Monographie des Calopterygines are, for the males: — 



The superior appendages have the distal tubercle of the inner margin 

 ("dent trSs-petite et arrondie") more acutely pointed, but there is consider- 

 able individual variation in this respect. 



The red at the base of the front wings extends along the costa one-half to 

 two-thirds of the distance to the nodus; the outer (distal) edge of the red col- 

 oring is convex, so that the farthest point from the base of the wing which it 

 attains is between the median and the short sectors and slightly more than 

 three-fourths the distance from the base of the wing to the nodus, while it 

 attains the hind margin of the wing at about the same level as its point of 

 separation from the costal margin. 



The color at the base of the hind wings is also red, but with an admixture 

 of brown, especially near the anterior margin of the wing; it extends along 

 the costa from the base to almost three-fourths the distance to the nodus, 

 the outer (distal) edge is nearly straight and extends backward and some- 

 what inward (mesad) from the costa to within one cell of the hind margin of 

 the wing, where it turns basalward and gradually approaches the hind mar- 

 gin of the wing, reaching it in from six to eight cells, or at about the level of 

 the distal end of the quadrilateral. 



The pterostigma varies from light brown to black. 



The yellow humeral and first lateral thoracic stripes are interrupted or may 

 almost entirely disappear. 



The metallic coloring, especially on the thorax, tends to purplish, but this 

 may be the effect of the alcohol in which the specimens were preserved. 



Female. In the females the extent of the brownish yellow coloring at the 

 base of the wings is difficult to define, owing to its gradually fading into 

 yellow, the pterostigma is always yellow, the humeral and first lateral tho- 

 racic stripes are never interrupted, the mid-dorsal carina is never yellow, 

 the metallic color in the majority of individuals is green. 



Dimensions: Abdomen, $ 32-34 mm., ? 28-30 mm.; hind wing, S 24-25.5 

 mm., 2 25-26 mm. 



20 3 18? Tepic, Oct., 1894, Eisen and Vaslit. 

 223 4 ? " Nov., 1894, " 



33 10 ? No locality or date. 



45 3 32? 



1 Proc. Ent. Soc. Phila., Vol. II, 1863, p. 227. 



