LIGNYOSTOLA.— HYALOTHYK1JS. 351 



subapicalibus semihyalinis fulvo tinctis ; postieis fasciis duabus evanescentibus pallide fulvis, una ad cellulae 

 finem, altera discali : subtus ut supra, alis ad basin viridi lavatis ; anticis maculis duabus alteris costalibus 

 supra macula cellulari ; postieis plaga mediana irregulari fasciaque irregulari angusta submarginali : 

 antennis nigris, corpore fulvido, capite albido maculato, palpis et corpore subtus albidis ; plica 

 costali obvia. 

 2 mari similis, sed plica costali nulla. 



Hab. Costa Eica (Van Patten). — Guiana 1 ; Amazons Valley. 



Several specimens of both sexes of this species were in a collection made by Mr. Van 

 Patten in Costa Eica, but we have no other evidence of the occurrence of Lignyostola 

 crinisus within our limits. These specimens agree with our series from the Amazons 

 Valley and Guiana and with Cramer's figure, which shows the diaphanous spots on the 

 primaries very plainly, and also the dark border to the secondaries beneath, broken by 

 an irregular band of the same colour as the base of the wings. 



The male genitalia have a cleft tegumen, the points depressed and divergent ; the 

 scaphium is well developed and granular towards the ends ; the harpes are split hori- 

 zontally, the two points diverging and horn-like, the lower one sharp, the upper one 

 blunt : a very different structure from that of L. lacydus. 



HYALOTHYEUS. 



Hyalothyrus, Mabille, Ann. Soc. Ent. Belg. xxi. p. 23 (1878) ; Wats. P. Z. S. 1893, p. 40. 



Mr. Watson states that the members of this genus have only one pair of spurs to the 

 hind tibiae ; but the only species that has this character is II. inf emails (Moschl.). 

 H. nitocris (Cr.), the type of the genus, H. neleus, and H. priscus (Feld.) all have the 

 second subterminal pair of spurs. It therefore becomes a question if the absence of the 

 second pair of spurs is of much importance, H. infernalis in other respects being 

 obviously allied to the other species of the genus. 



The antennae are rather long, the club very slender, slightly bent, and drawn to a 

 fine point at the end. Palpi with a long projecting porrect terminal joint. Primaries 

 with arched costa and rather pointed apex, the outer margin convex; cell long, quite 

 three-fourths the length of the wing ; the upper discocellular long, the middle and 

 lower discocellulars short and subequal ; third median segment short, the second double 

 the third ; discocellulars of secondaries feeble, third median segment long, the second 

 segment about equal to the second subcostal segment, anal angle slightly lobed, outer 

 margin rounded. Hind tibiae with two pairs of spurs and a dorsal crest. Primaries 

 of the male with a costal fold. 



The species of Hyalothyrus range from Nicaragua to Guiana and the Amazons Valley, 

 only one, H. neleus, occurring within our borders. 



1. Hyalothyrus neleus. (Tab. LXXXI. fig. 27 $ .) 



Papilio neleus, Linn. Mus. Ulr. p. 260 ; Syst. Nat. i. pt. 2, p. 792 (1767) (ex Clerck, Ic. Ins. t. 45. f. 2). 

 Hyalothyrus neleus, Mab. Ann. Soc. Ent. Belg. xxi. p. 23; Wats. P. Z. S. 1893, p. 30. 



