104 



STYX. By J. Roher. 



Iheiicharila. D. theucharila Dbl (30 f), from Venezuela, also shows a general resemblance to an Ithomiid. The ? 



nella. has the hindwing entirely brown with black markings and broad yellow basal band to the forewing. — nella 



Bilr., from Colombia, is not different except that the spots of the middle row are not yellow but transparent 



white. 

 lysinoc. D. lysinoe Hew. (30 d), from the Upper Amazon, is similar to siloe, but has in the male only a broad 



yellow marginal band, which is bordered anteriorly by a black band. 

 lysinoides. D. lysinoides Sigr. (30 f), from West Colombia (Cauca Valley), is only known in the female. It is very 



similar to lysinoe, l)ut has on the underside of the hindwing a complete row of white marginal spots. 

 erythroe. D. erythroe Bates (30 f), from the Amazons (S. Paulo de Olivenga), is rather similar to Hypoleria uure- 



liuna, aureola, etc. It is rather variable, the red-yellow apical spot being sometimes divided into several spots, 

 sometimes there is also a red-yellow spot near the inner angle. 

 Mlcsi. D. batesi sfec. nov. (= lysinoe var. Heiv.) (30 f), from the Amazons, has not only very much red-yellow 



marking on the forewing but also a very broad red-yellow band on tlie liindwing. The transparent parts of 

 the wings are bluish. 

 leucoHoe. D. leuconoe Bates, from the Amazon Kiver (S. Paulo de 01iven(,-a), has a larger red-yellow snbapical 



melanoides. spot and yellowish subapical band on the hindwing. The latter is entirely absent in melanoides form. nov. 

 (30 f, g), from Ecuador (Coca), which also has smaller transparent spots on the forewing and somewhat broader 

 black distal margin to the hindwing. This species is very similar to Ithomia idu and ilerdina. 

 joriunaia. D. fortunata Luc. (30 g), distributed from Mexico to Chiriqui, has a general Ithomiid-habitus, but 



without special resemblance to any particular species. The transparent wings have black margins and bands. 

 The ? has a whitish transparent subapical band, the (^ in its place some entirely glassy spots. — Whether 

 iihomiella. ithomiella form. nov. (30 g), from Ecuador (Balzabamba), is a form of fortunata or a separate species I am unable 

 to judge for want of sufficient material. The ^ differs from fortunata-^ in that the glassy median spot of the 

 forewing is broader but shorter and behind it there is another small glassy spot. The $ is very different from 

 fortunata-'!^, as may be seen from the figure. Beneath the (J has larger white marginal spots, also the $ has 

 complete rows of larger and rounder white marginal spots, whilst the $ of fortunata has only 3 white dots on 

 the apex of the forewing. 

 anlherize. D. antherize Heiv. (29 h), from Mexico, is in the male similar to the fortunata-^, it has no light markings 



on the distal part of the forewing except a broad white subapical band. On the underside of the liindwing 

 argochloe. there is a large white apical spot. — In argochloe Bates, from Ega, the margins of the white band of the 

 forewing are sinuous, the hindwing is darker and has a submarginal narrow hght band. 

 avonia. D. avonia Heiv. (29 h), from Ecuador (Quito and Balzabamba), has semitransparent yellow markings, 



pallida, whilst pallida form. nov. (seasonal form?), from Ecuador (Paramba and Chimbo), has much lighter, glossy mark- 

 ings, entirely white in the distal part of the wing. The under surface is similar to the upper, but both wings 

 bear at the distal margin a row of white spots. 

 pinthaeus. ^' pinthaeus L. (= eumelia Cr., vocula Cr.) (29 h), from Guiana, the Amazons, etc., has yellow upper 



surface witli black markings ; in the ? there is also a black stripe at the costal margin of the hindwing. The 

 under surface is similar to the upper, but has small white marginal spots and on the hindwing a red-brown 

 amelina. submarginal band. The species somewhat resembles the Ithomiid-genus Aeria Hbn. — amelina Ho pff. (29 h), 

 from Peru, has narrower black bands and consequently larger yellow areas, also the red-brown marginal band 

 ela. on the underside of the hindwing is narrower. — ela Hew., from Ecuador, has in addition small yellowish 

 submarginal spots at the inner margin of the hindwing and the submarginal band of the hindwing is yellow 

 instead of red-brown. 

 ithomia. D. ithomia Hew. (29 h), from Ecuador, is similar to pinthaeus, but by the division of the postmedian 



yellow band 4 yellow spots are formed on the forewing, also the distal margin of both wingf? has a complete 

 row of white spots. 

 methymna. D- mtthymm Godt. (30 g), from Brazil (Minas Geraes), is above an exact copy of Heterosais gazoria 



Goit. (36 d), which flies together with it. Beneath the two species differ in that metJnjmna has white marginal 

 spots on both wings and on the hindwing an indistinct red-brown submarginal band. 



36. Genus: Styx Stgr. 

 As already said, the systematic position of this pecuhar genus is altogether uncertain. The idea that 

 Styx i^ifernalis might be the $ of an Erycinid is however incorrect, since the (J of inferjialis is also known. 

 The external appearance of this insect is Pierid-like, similar to Davidina alticola, which is figured in vol. I, 

 pi. 19 b. The neuration of the forewing shows no striking differences, on the other hand that of the costal margin 

 of the hindwing is not unhke certain Ithomiids. In the structure of the palpi and legs the genus shows great 

 similarity to the Erycinids. 

 infernalis. S. infernalis Stgr. (30 g), from south-eastern Peru (Chanchamayo), is in both sexes transparent grey- 



black with lighter central part of the wings. Only a few specimens of this species are known, so that it would 

 • seem to be very rare or only to occur in a few restricted localities. 



