HESPERmi: Tin-: (;knus thanaos. 1447 



Iliiul wings very broad, roumled, trinngiiliir, fully as broad as long, prodnced in the 

 subcostal region so as to give a scarcely arcuate, costal margin much longer than the 

 internal: outer margin well rounded, entire, with the least perceptible fulness at the 

 submedian nervure; the wing roundly anguhite and sub-rectangular aljove. Basal 

 union of the costal ami suljcostal brief, enclosing a suuall, circular Lacuna Ijctwcen 

 them, their separation marked by a s\iture; the subcostal almost in continuation of its 

 earliest course, forking at two-fifths tlie distance to the margin, united to the median 

 nervure by a cross vein which runs parallel to the outer margin but is entirely obsolete 

 and indicated only by the bend in the nervures at a point an equal distance beyond their 

 last divarication ; median nervure as in Thorybes ; internal nervure diverging consid- 

 erably from the submedian shortly beyond its origin, so that the tip of the median is 

 midway between it and the lower branch of the submedian. 



Dermal appendages of the male concealed in the costal f<jld of the fore wing (43 : 12 ; 

 45 : 2-3), consisting of long, bas.ally pediforni bristles sometimes repl.accd by slender, 

 sublanceolate. flagellate androconia or by slender, twisted riblwns ; sometimes accom- 

 panied also by rod-like bristles, occasionally two-pronged at tip, and by small apple- 

 seed androconia. 



Legs 2, 3, 1; all the femora tufted beneath with a somewhat spreading fringe of 

 delicate hairs, very long at the base of the femora, regularly and greatly diminishing 

 in length toward the apex ; middle and hind tibiae with a similar very thin fringe upon 

 the upper surface, the hairs of nearly equal length. The males are more heavily tufted 

 than the females. Femora 2, 1, 3 in ?, 2, 1, 3 in $ ; tibiae 2, 3, 1; tarsi 37^, 1. 

 Fore femora scarcely longer than the hind pair in the $ , equal in the $ , .about two-thirds 

 the length of the middle femora ; fore tibiae nearly two-thirds as long as the fore femora, 

 half as long as the middle and three-fifths as long as the hind tibiae. Leaf-like appen- 

 dage of fore tibiae long and slender, more than half as long as the tibia, four to eight 

 times longer than broad, equal, bluntly pointed at tip, a little arcuate, attached at 

 about the centre of the tibia; other tibiae furnished at tip with a pair of very long 

 and slender, scaled, apically naked spurs and the hind tibiae also with a similar but 

 smaller, sometimes much shorter pair in the middle of the apical four-fifths or two- 

 thirds of the tibiae. Tars.al joints 1, 2, 3, 5, 4, the apical fully as long as the antepe- 

 nultimate joint ; fore tarsi two-thirds as long as the others, which are equal .and as long 

 as the middle tibiae ; all with a triple row of ilelic.ate spines beneath, the apical ones of 

 each joint longer than the others ; basal joint as long as the rest of the joints on the 

 hind legs, a little shorter than they on tlie others ; second joint half as long as the first 

 on the fore legs, about tivo-fifths as long on the others. Claws small but moderately 

 strong, tapering, strongly and regularly arcn.ate, finely pointed. Pad pretty large, cir- 

 cular, attached by a slenderneck ; paronychia slender, thread-like, nearly half .as long as 

 the claw, the tip rounded. 



Second abdominal segment three or four times longer than the first, half as long 

 again as the third, beyond this decreasing regularly, the eighth segment broadly pro- 

 duced above in the male to a convex, entire, rounded plate, the whole fully three times 

 as long as the preceding segment, and furnished with very long scales ; the side pieces 

 (clasps) of the male are fringed with numerous, not very long hairs and covered pro- 

 fusely with short scales and are long and slender, directed a little upward and apically 

 inward. The upper organ varies exceedingly in shape and proportionate size; centrum 

 gibbous, subovoid, contracted toward the tip, and bearing at the extremity a pair of 

 hooks, occasionally consolidated, at the inferior junction of which a minute, appressed, 

 central plate or tooth, dentiform on a side view, frequently depends ; near the middle of 

 the upper portion of the centrum, the surface is either simply a little elevated; or 

 expanded after elevation into nearly horizontal alations; or it rises into a dorsal, 

 usually horse-shoe shaped crest, the sides of which sometimes form conspicuous lateral 

 expansions, the whole crest being frequently asymmetrical in elevation and lateral ex- 

 tension and bearing on its upper edge or surface an armature of spines; from the mid- 

 dle of the upper surface, lateral arms extend downward and then curve backward, 

 meeting i)chind, and at their united extremities expand into a transverse, usually 



