26 



tiguous to inner margin of the proharpe. Penis (PI. VI, Fig. 8) 

 cun-ed, provided distally on each side with a row of 5 or 6 small teeth. 

 9 . The Vaginal Plate (PI. VI, Fig. 2) is irregularly semi- 

 circular ; the Lateral Folds spindle-shaped, more pointed posteriorly 

 than anteriorly ; the chitinous folds around the vaginal opening very 

 variable, considerably raised above the surface of the plate, roughly 

 semicircular in outline ; the Alae broad, rather sharply pointed apically, 

 the inner margin bent over to form a chitinous fold, the outer margin 

 forming a sharp edge. 



Habitat: S. Arizona (Palmerlee, Redington, Prescott, White 

 Mts.) (C. Biederman, M. Chrisman) (Sept.-Oct.) ; S. E. California 

 (Wright) ; Mexico (N. Sonora). 



M. ARYXNA Dyar. (PI. I, Figs, i and 2, $ , Fig. 3, 9 .) 



Megathymus aryxna Dyar, Jour. N. Y. Ent. Soc, XIII, 141 (1905) (partim). 



Dyar's original diagnosis of this species cannot apply to it in its 

 restricted form, nor does Druce's figure (1. c. PI. 69, Fig. 4) represent 

 this species. We would briefly describe it as follows : 



Primaries deep black-brown, crossed as in neumoegeni by an irregular sub- 

 terminal fulvous band composed of spots finely separated by the veins ; the 

 three spots between veins Ms and anal vein large, quadrate, the middle one being 

 the largest, broader than long, projecting further towards base of wing than 

 the neighboring spots, inner margin wedge-shaped ; a fulvous spot near costa 

 at end of cell, separate from subterminal hand in 3 , joined to it in 9 ; base of 

 wing covered with fulvous hairs which partially conceal a small fulvous patch 

 above anal vein near base of wing. Secondaries with a subterminal band of 

 irregularly quadrate fulvous spots ; basal area with some fulvous hair and 

 traces of several fulvous spots. Beneath primaries much as above, secondaries 

 sprinkled with sparse white scales, with an indefinite irregular submarginal white 

 band, narrow and broken at costa, broader toward anal angle ; a white spot below 

 costa near base, and some white suffusion near inner margin towards base of 

 wing. Expanse 60 mm. 



We have already pointed out the main features of difference in 

 wing pattern between this species and neumoegeni and would refer to 

 our figure for further details of maculation. The Claw seginent (PI. 

 Ill, Fig. 11) is well spined ventrally and bears numerous fine hairs 

 laterally; the pulvillus is reduced to a short conical tubercle; the 

 paronychium consists of a very narrow ribbon-like band without lobes. 



Genitalia. The $ organ is essentially similar to that of neu- 

 moegeni; the Blade (PI. V, Fig. 6) is, however, much stouter, blunter 



