( 426 ) 



variegated with grey than in others ; yellow area of hindwing rather constant, 

 always reaching to base ; the yellow patch at anal angle is rather large in some 

 individuals, vestigial in others. The black snl)marginal line of the forewing, above, 

 distinct in hisca, is barely vestigial at apex and in middle ; a greyish, cnrved, 

 snbtriangnlar shade extends from costal margin to end of W, bordering a Lali'moon- 

 shaped darker distal marginal space. The underside is generally uniform in colonr, 

 with the submarginal line of the forewing distinct at least from tip of wing to R', 

 bordered grey distally. Distal margin of forewing more sliarply augnlated at R^ in 

 some sjieciniens, snch individuals having generally also a small tuoth at R-. 



S. Sexnal armature as in grisea, differing from that of pallida in the much 

 smaller patch of spines on the inner surface of the clasper above the harpe, and in 

 the much shorter whip of the penis-sheath. 



?. Vaginal plate (PI. XLI. f 5) also as in grisea, more triangular than in 

 pallida ; vaginal orifice subapical, transverse, covered by a broad flap ; proximal 

 part of plate almost regularly folded. 



Hah. Gnatemala to Bolivia and Rio de Janeiro. 



In the Tring Museum 56 specimens from : Guatemala ; Chiriqui ; Paramba, 

 Ecuador, 3.500 ft. iv. '97, dry season (Rosenberg) ; Chanchamayo, Peru ; St. 

 Domingo, S.E. Peru (Ockenden) ; Mapiri R., Bolivia, viii. ix. (Stnart) ; Rio de 

 Janeiro. 



303. Perigfonia lusca. 



Sphinx lusca Fabricius, Ui-n. Jim. p. 272 (1777) (Am. merid.) ; Goeze, Eiit. Bci/li: iii. 2. p. 20il. 



n. 22 (178(1) ; Fabr., Spec. Ins. ii. p. 140. n. 5 (1781) (Am. merid. insulis !) ; id. .Uanl. Ins. ii. 



p. 92. n. 5 (1787) ; Gmel., %s^ Nat. i. 5. p. 2372. d. 61 (17'J0) ; Fabr., Ent. Syst. iii. 1. p. 35(!. 



n. 6 (1793). 

 Perigmiia lusca, Walker, List Lcp. Ins. B. .1/. viii. p. 101. n. 1 (1850) (partim) ; Clem., Proc. Ac. 



Nat. Sc. Phllad. iv. p. 138. n. 15 (1859) (synon. partim ; Mexico ; S. Am. ; W. Indies) ; 



Morris, Cat. Lcp. N. Am. p. 17 (18IJ0) (partim) ; Clem., in Morri.«, Syn. Lep. N. Am. p. 160. 



n. 1 (1862). (partim) ; Grote & Rob., Pruc. Ent. Soc. Philad. v. p. 152. n. 23 (1865) ; Boisd., 



Cons. Lep. Giiatcm. p. 07 (1870) ; id., Spn: Gen. Up. Hit. i. p. .325. n. 9 (1875) ; Butl., Teans. 



Zool. Sue. Land. ix. p. 532. n. 5 (1877); Druce, Biul. Centr. Am., Lep. Ilet. i. p. 3. n. 1 (1881) ; 



Kirby, Cat. Lep. HH. i. p. 630. n. 6 (1892) ; Druce, I.e. Snppl. p. 299 (1896) (Mexico ; Guate- 

 mala ; Chiriqui). 

 *Perigonia reslituta Walker, I.e. xxxi. p. 32 (1864) (Mexico ;— Mu8. Brit.). 



There is apparently no constant difference by which the various forms lure 

 united to one species can be distinguished ; we have vainly endeavoured to find 

 constant distingnishing characters. The sexual armature, apart from individual 

 variation, is the same in all of them ; but that is not an argument of weight in the 

 present genus, as species so different in colour as stiilta- and grisea agree also in 

 these organs. The details of the shape and colour of the wings which have served 

 the various authors as specific characters are unreliable, there occurring so many 

 intermediate si^ecimens that it is impossible to say where one so-called species ends 

 and another begins. The difficulty of dealing with these insects is increased by the 

 lack of sufficient material from the West Indies. A larger series of individuals 

 from the islands may possibly prove that lej'ebraei and jamaicensis are also not 

 specifically distinct. 



i ? . Yellow band of hindwing not extended to base, seldom as broad as the 

 blackisli distal border of the wing, often reduced, not rarely obliterated. Black 

 snbmarginal line of forewing curving from apex to hinder angle always distinct; 

 a cousjiicuous, mostly straight, brown antemedian line crossing M distally of M-, 



