( 423 ) 



thau in (?, as is also the case in riscus, the yellow abdominal margin of ? almost 

 separated from the yellow anterior area. 



(?. Tenth abdominal segment (PI. XLII. f. 10) eeiy broad, the lobes strongly 

 cnrving downwards ; tergite curving downwards and inwards, narrowing to apex 

 in side-view (PI. XLII. f. II), twisted, not jiointed ; lobes of sternite projecting 

 vertically ventrad and then curving evenly distad, horn-shaped, dilated at base, 

 the dilated part cariuate on the inner surface, the hook finely channelled. Harjje 

 (PL XLVII. f. 3) produced into a slender, tapering process. Penis-sheath (PI. LIII. 

 f 41) without whip, ending in a slightly curved, conical, pointed, not movable 

 process ; no teeth. Penis-funnel without armature. 



? . Vaginal plate rounded triangular ; orifice open, the edges raised. 



Hab. Peru ; Bolivia ; probably of wider distribution. 



In the Tring Museum 2 cJcJ, 1 ? from : Rio Cachyaco, Prov. Iquitos, Peru 

 {ti/pe ; Stuart) ; Bolivia (Garlepp). 



CVL PERIGONIA.— Typus : stulta. 



Sphiiir, Fabricius (iion Liune, 1768), Gen. Ins. p. 272 (1777). 



Perigiiiiia Herrich-Sch., Aii.'!.^emtr-Schm. i. (1H54) (tiom. indescr. .') ; Walk., Litit Lep. Im. B. M. 



viii. p. 100 (185G) (partim ; type : hisca Walk, partim = stulta H.-S.) ; Boisd., Spec. Gin. Lip. 



Ilil. i. p. 320 (187.5) (partim). 

 Macroglusxa, Lucas, in Sagra, Hist. Cuba vii. p. 289 (1856). 

 Stenohijiliia Felder, Reisf Novum, Lep. t. 82 (1874) (nom. indescr. .'). 

 Pacl(i/(piiiiii, Burmeister (mm Butler, 1877), Descr. Rep. Argent, v. p. 35G (1878). 



J ¥ . Palpi prominent, rounded in dorsal and in lateral view. Scaling raised to 

 a crest on occiput, the crest divided anteriorly in perfect specimens. Antenna 

 slender, not incrassate distally, hook rather short and abruptly curved, end- 

 segment individually variable in length, equalling one, two, or three previous 

 segments. Spines at edges of abdominal segments strong, arranged in three or 

 four rows, the proximal spines longer than broad ; sixth sternite of ? transverse, 

 entire apical edge sjiinose, mesially slightly concave ; anal tuft truncate in ? , 

 bisinuate, with the narrow mesial part prolonged in <?. Legs normally scaled; 

 .midtarsns with comb. Forewing pointed, discal edge convex in middle. SU- and 

 It' of hindwing from upper angle of cell, U? and M' close together, D' very oblique, 

 lower angle of cell sharply acuminate. 



(?. Tenth segment of the same type as iu Sesia, the tergite and sternite being 

 divided each iuto two lobes (PL XLII. f. 12—15). Clasper long, narrow, curving 

 upwards, ajiex obtuse ; harpe short ; a small ridge above its base, bearing short, 

 stout, curved spines (PI. XLV^II. f. 4. 5.0) ; no friction-scales on outer side. Penis- 

 sheath ending in a whip of variable length, armed with short tooth-like spines, 

 similar spines on the sheath near the base of the whip (PI. LIV. f 0. 7). 



Early stages not known. 



Ila/>. Tropical and Subtropical America : Bahamas to Buenos Ayres northward 

 into the United States. 



Eight species. 



Key to the species : 



a. Yellow area of hindwing extended to base . . . l>. 

 Yellow area of hindwing not extended to 



base, or hindwing without yellow band . . . (/. 



