llESrERlUI: TIIANAOS K'ELUS. 



1509 



tip of the ses;nie"t'^. grayish brown bencatli. Upper organ of male appendages 

 (36:30-32) with the centrnin sliort. pretty higli, not very slender. Dorsal crest con- 

 sistin;; of a pair of very small, horizontal, lateral alations. the posterior angle of each 

 roniulod, the anterior produced laterally as a bluntly pointed triangle. Hooks forming 

 a single, stout, slightly curving, pointed beak, dii'ected backward, bearing beneath, just 

 beyond the middle, an appressed, dentiform, backward curving appendage, which is 

 provided, on the outer edges of its apex, with a pair of short, stout, divaricate 

 thorns; on cither side of the extreme base of the hook, its upper surface expands 

 laterally to a very slight degree; and from the extreme base of its lower outer sur 

 face an appressed, conical tooth projects downward and slightly ontwai'd. Lateral 

 arms broad at base, narrowing rapidly, directed downward and at the bottom bent at 

 nearly right angles liackward ; they then curve backward, inward and upward, 

 broadening slightly until they meet at some distance below the hook, bearing, on the 

 whole of the outer lower surface of the curving portion, the inferior armature of 

 rather distant, comparatively large, short, blunt spines, largest at the most posterior 

 point. Left clasp : Main body very broad, increasing slightly in breadth from the base 

 half way to the tip, nearly flat and straight, the upper edge produced and curved in- 

 ward a little near tlie base, the lower edge a little full near the base. Blade straight, 

 its lower edge continuous with the lower edge of the main body, slender, uniform, 

 slightly compressed, not very long, armed at the apical half with minute, raised 

 points, and terminating in a rounded point; Irasal process as broad as long, rounded, 

 compressed, its hinder two-tliirds bent at right angles inwards and a little upwards, 

 and armed along its whole edge and a portion of its upper surface with minute 

 spinules. Lobe rounded, deeply and roundly excised on either side, of about the size 

 of the basal process of the blade, but smooth ; just in advance of it tlie upper edge of 

 the main body is slightly prominent. Bight clasp : Main body similar to that of oppo- 

 site side. Blade of tlie same length as that of the left clasp and otherwise similar, but 

 curving very slightly inward and terminating in an unanued, slightly rounded point, a 

 very little angulated at the tip; basal process developed as a dactylate apophysis, 

 directed upward, nearly at right angles to the blade, compressed, but twisted at right 

 angles, so as to appear depressed, a little broader th.an the blade, shorter by nearly 

 one-half, its tip broadly and regularly rounded, and armed with minute spinules. 

 Lobe developed as a bluntly rounded, rather prominent plate in the middle of the upper 

 half of tlie whole piece. 



Described from 39^ , 79 . 



Accessory sexual peculiarities. The costal fold of the fore wings of the male 

 shows, seated on the marginal vein, a crowded imbricated mass of pallid, long oval 

 scales (47 : 6 e) followed by an open fleld planted in a relatively sparse manner with 

 little hilobed triangular androconia (G b) ; .and this by a dense field of erect, slender, 

 parallel sided scales, slightly enl.arged and trilobed apically , all the lobes rounded (6 c) ; 

 these last conceal between them the triangularly lanceolate, slender, flagellate andro- 

 conia (fi d), only the ftagella appearing above the mass; large ovate cover scales, 

 genei-ally asymmetrical (G a, f), complete the series. 



Egg. Very pale green, of equal height and breadth, broadly rounded and even trun- 

 cate at the base, broadest next the base, gently narrowing above, broadly rounded and 

 slightly shouldered above, the central space between the terminations of the ribs 

 saucer-shaped and considerably sunken, the central micropyle still further depressed. 

 Sides with from ten to fourteen ribs, of which eight reach the summit, most of the 

 others stopping just short of the saucer; they are strongly compressed, tolerably 



