NYMPHALI^^^. 
275 
Genus DIADEMA. 
Diadema, Boisd.,i " Voyage de I'Astrolabe — Lep., p. 135 (1832)," and Faune 
Eiit. de Madag., p. 39 (1833); Westw. ("Section A. Sub-Section a, 
Divn. of Diadenia), Gen. Diiirn. Lep., ii. pp. 279-280 (1850); 
AVallace, Trans. Ent. Soc. Loud., 1869, p. 277 ; Trim, (part), Khop. 
Afr. Aust., i. p. 150 (1862). 
Imago. — Head large, as wide as tliorax, densely hairy and scaly, 
and with a long tuft of hairs in front ; eyes large, prominent, smooth ; 
palpi rather stout, elongate, widely separated, divergent, porrected 
horizontally, not rising above middle of eyes, densely scaly, — second 
joint long, with a dense fringe of short, stout hairs superiorly and 
internally, — terminal joint of moderate length and rather broad, with 
the tip rather blunt ; antennce rather short, slender, with an abruptly- 
formed, subovate, slightly-flattened club, bearing a minute acute point 
at its extremity. 
Thorax moderately stout, clothed beneath and anteriorly above 
with short hair, posteriorly above with long liair. Fore-wings elon- 
gate, produced apically ; costa considerably arched ; hind-margin con- 
cave about middle, slightly sinuated ; posterior angle prominent but 
rounded ; inner margin slightly emarginate in middle ; costal nervure 
strong, terminating at some distance beyond middle ; first and second 
subcostal nervules arising not far from each other, a little before extre- 
mity of discoidal cell, — third at a considerable distance beyond cell, 
and terminating at apex ; upper disco-cellular nervule very minute, — 
middle one rather short, very strongly curved or bent towards base 
of wing inferiorly, — lower one well developed, rather long, slightly 
curved, united to third median nervule at a little distance beyond 
its origin ; discoidal cell rather short, truncate. Hind-vnngs broad, 
rounded, somewhat truncate ; costa very convex close to base, thence 
moderately arched ; hind-margin sinuated ; anal angle marked, rather 
prominent ; inner margins strongly convex to considerably beyond 
middle, forming a broad, deep groove completely receiving abdomen, 
thence markedly divergent ; costal nervure extending to apex ; dis- 
coidal cell very short ; upper disco-cellular nervule (forming base of 
radial nervule) united to second subcostal nervule not far from the 
latter's origin, — lower one very slender but quite distinct, slightly 
angulated towards base of wing, joining median nervure at or a little 
before origin of second and third nervules ; internal nervure rather 
short, terminating just at end of convexity of inner margin. Fore- 
^ Mr. W. F. Kirby [Syn. Cat Diurn. Lep., 1871, p. 224) has abandoned Diadema as a 
name preoccupied, and has substituted for it Htibner's title of Ili/polimnas. It is true 
that the name Diadema was proposed by Schumacher in 1817 for a genus of Cirripede 
Crustacea, but it has not been adopted in that class, being synonymous with Lamarck's 
genus Coronula, founded in 1802. (See Darwin, Monogr. Cirrip., 1854, p. 397.) 
