HESPERD)!: TIIANAOS JUVENALIS. 



1479 



Abdomen above blackish brown, the tips of the segments paler ; beneath, ochraceous 

 brown. Terminal sci;raent of male covered with a row of very long scales, arched or 

 semicircular when viewed posteriorly ; sides jrreatly expanded and clothed with much 

 shorter hairs ; clasps covered with very lonar hairs nearly to their tip and extending 

 as far back as the uppermost scales ; all the scales of the body color, a dark mouse brown. 

 When denuded, the terrain.al segment is seen to be projected over the aperture, forming 

 a rounded lobe almost entirely concealing the upper organ. Upper organ (36:24-27, 

 34,35) having the centrum rather long and not high, nor greatly curved ; posterior 

 part of upper surface elevated, and bearing, near the extremity, a crest in the form of 

 an appressed plate, facing backward and very slightly upward, narrow at base, rapidly 

 and greatly expanding above, the outer angles sharp, the upper border broadly arched, 

 and bearing an extensive armature of slentler clustered spinnles, curving forward; 

 anterior to it the upper surface has a distinct median furrow. Hooks short and stout, 

 compressed, bluntly pointed, div.aricate, pretty widely distant at base, and bearing at 

 their junction a pretty broad, very short anil small, bilobed, appressed tooth. Lateral 

 arms of nearly uniform size, curving in all their course, having at first a general down- 

 ward direction, then bent in a sharp angular curve, at less than a right angle, beyond 

 which the limb is directed upward, backward and inward, and bears at the united tips 

 the inferior armature, which is a very large and broad belt of raised points. The 

 crest and arms are somewhat asymmetrical. Left clasp: Main body pretty broad, 

 irregularly gibbous, increasing rapidly in width from the base backward, the terminal 

 edge sfjuarely docked between the lobe and bl.ade. Blade very long and slender, the 

 outer surface facing upward and outward, curving slightly inward and upward, the 

 upper edge with a median, broad, slight denticle, the apex rounded, its inner angle 

 produced to a sharp point, bent inward and a little downward, armed with minute, 

 spinnles; basal process subtriangular, attached by a narrow neck, one apex, with the 

 smaller half , directed backward, its tip pointed and bent a little inward; the other 

 apes, with the larger half, directed upward and a little forward, bent also strongly 

 inward, and at the same time twisted so as to make the outer surface face a little 

 backward ; this part of the surface is armed with minute spinules and the tip is 

 rounded. Lobe widely distant from the basal process of blade, quadrate in shape, 

 nearly twice as broad as long, a little broadest at apex, directed backward and a 

 little npward. curved also somewhat inward and a little downward, the lower portion 

 of apex a little produced, rather laterally than apically, but ronnded. Sight clasp: 

 Main body not broad, nearly equal, the upper portion of the base largely docked 

 diagonally. Blade long and broad, directed somewhat upward, curved, especially 

 near apex, a little inward, the outer surface twisted a very little upward; it is 

 broadest in the middle and tapers beyond very gradually to a well rounded tip ; 

 basal process wanting. Lobe closely contiguous, and at base parallel to the blade, 

 long and slender, directed a little upward , curved inw.ard; the apical half tapers sud- 

 denly to a long and very slender, nearly equal, curving dactyl, directed a little down- 

 ward and nearly straight inward, bluntly pointed and armed at the apex with some 

 very minute spinules. 



Measurements in millimetres. 

 Length of tongue, 9.5 mm. 



Length of fore wing 19.5 



antennae 9.5 



hind tiljiae and tarsi 7.85 



fore tibiae and tarsi 4.95 



MALES. 



Smallest. Average. Largest. 



20. 

 9.75 

 7.85 

 5.2 



22.5 

 U. 



9. 



5.75 



FEMALES. 



Smallest. Average Largest, 



18. 

 8.75 

 6.25 

 4.5 



21. 



9.8 

 7.9 

 0.25 



21.5 

 10.5 



9. 



6.25 



Described from 58 3 , 24 $ . 



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

 (43 : 12) encloses a clustered mass of pediforra bristles (47 : 5 e) about 1 mm. long; 

 scaphiform androconia and others of varying shapes ( 5 a, b) seated on the costal 

 vein; stout, simple, or rarely two-pronged, arcuate bristles; and large, broadly 

 rounded cover-scales (5 c, d) varying somewhat in size and shape. 



