118 ATHESIS; THYRIDIA; TITHOEEA. By B. Haensch. 



6. Genus: Athesis DM. <£ Hew. 



The species of this genus are similar to the preceding, but mostly considerably smaller. They are distin- 

 guished by the angled lower discocellular and the long cell of the hindwing. All are mountain species from 

 the north-west of South America. 



clearisla. A. clearista Dbl. & Hew. (31 e), from Venezuela, has vitreous wings with dark margins and two oblique 



bands over the discocellular and across the middle of the cell of the forewing. A streak along the median of 

 the forewing and the veins in the disc of the hindwing are yellow-brown. The long antennae are black. 



cwrisione. A. acrisione Hew., a beautiful but rare species from Ecuador, is considerably larger; the apex of the 



forewing margined with yellow-brown. Across the end of the cell of the hindwing to the inner angle runs a black 

 band, part of which is confluent with the distal margin. In the latter are placed also above large, white 

 submarginal dots. 



lercijUklas. A. dercyllidas Hew. (32a). The wings have the appearance of greenish glass; especially on the under 



surface the glassy spots are more strongly margined with green. Some of the dark margins and bands on 



the upperside are bordered with yellow-brown. On the underside they are yellow-brown with dark edges. In 



the pattern and the greenish colouring the species recalls Colaenis dido; it flies in Colombia and Ecuador. — 



demylus. Godman and Salvin designate as demylus a form from southern Ecuador with very narrow margins and bands. 



heivitsoni. A. hewitsoni Srnka. This species was figured by Hewitson as (J to dercyllidas, but recognised by Srnka 



as a separate species. It differs in the brownish tone of the hyaline spots and the narrower margins and bands 

 of both wings. In the oblique band across the end of the cell of the forewing is placed towards the distal margin 

 another oblong hyaline spot. 



oligijrtis. A. oligyrtis Hew. is a further form from Ecuador, similar to dercyllidas. It is said to have an in- 



distinct band between the discoidal veins before the distal margin of the hindwing, and also 3 white dots at 

 the costal margin; in addition a black band from the apex of the hindwing to the 1. median vein. 



7. Genus: Tliyridia Hkn. 



In this genus, which Doubleday and Hewitson call Metlwna, belong only a few larger species with trans- 

 parent, black-marked wings and thin black antennae provided with stronger, yellow club. The cell of the 

 hindwing is small and closed almost at right angles to the median. The species belong mostly t'o the plains and 

 occur from Guiana to Argentina and westwards to the Upper Amazon. 



confusa. Th. confusa Btlr. (= psidii Cr.) (32a). This species was long taken for the similar fsidii of Linne, 



which, however, belongs to quite another genus. The latter (pi. 34c) is easy to recognise, in addition to the 

 neuration, by the small reddish dots at the base of the forewing. confusa has transparent yellowish wings with 

 black margins and a transverse band on the discocellular of each wing, as well as a transverse streak through 

 the cell of the forewing. It occurs on the Lower and Upper Amazon, and in Guiana, in the shady places of banks 

 of rivers. — psamathe Godm. <& Sale, from eastern Ecuador and Peru, is a local form with narrow bands and 

 margins. According to Godman and Salvin there is a corresponding form of Dismorphia arise, whose $ very 

 nearly resembles that of Th. confusa and which occurs in the same localities as -psamathe and is said likewise to 

 have narrower bands and margins. — curvifascia Weym., from Ecuador and^the Upper Amazon, is a form in 

 which the black at the base of the hindwing is extended beyond the point of origin of the 1. median vein. 



thciuisto. Th. themisto Hhn. (32a). May be distinguished from the similar confusa by the absence of the broad 



transverse band on the discocellular of the hindwing. The larva according to W. Muller Hves on species of 

 Brunfelsia. It is deep velvety black with orange-coloured belts. The pupa is elongated, immovable, 

 white-yellow with narrow orange-coloured transverse bands and black stripes and spots. The species lives in 

 meyisto. central and southern Brazil to Argentina. — ■ Felder describes as megisto a form of the preceding from Bahia, 

 which is said to be larger and to have the veins less margined with black. On the other hand the median band 

 of the forewing is much broader and the distal margin of the hindwing irregular. 



inyuJaris. Th. singularis Stgr., likewise from Bahia, is smaller than themisto and has the inner margin of the hind- 



wing not dentate at the 2. median vein and on the upper surface edged with white. The costal margin of the 

 hindwing beneath is broadly j'ellow at the base and not interrupted with black on the precostal vein. 



8. Genus: Titliorea Dbl. <& Hew. 



In this genus 2 quite different groups were formerly included and I am compelled to separate the second 

 group under the name oi Hirsutis. The principal differences are the following: In Tii/iorea the eyes are hairy, 

 the tibiae of the middle and hindlegs are much longer than the femora. The (J(J have only 1 hair-tuft at the 

 costal margin of the hindwing. In Hirsutis the eyes are naked; the tibiae of the middle and hindlegs are 



