Publ. 30. VII 1909 LEUCOTHYRIS. Bij B. Hamsch. 14;1 



H. abida Hew., from Colombia, is similar, soniewbat smaller, witiiout black streak over the median of ubida. 

 tbe forewing, mtb narrower median band on tlie hindwing. Both wings have small white marginal dots. 



H. kezia Hew., from the Upper Amazon, has the markings like unchiala. But in the apex of the forewing kezia. 

 there are only three white spots, the others are replaced by an irregular, yellow-brown band at the end of the cell. — 

 In rezia Hscli. (38 c) the whole apex of the forewing is also yellow-brown except for the three indistinct whitish rczia. 

 spots, to each of which a Idack oblong spot is joined. This form flies on the Ucayali. 



H. fallax Stqr. (88 c) is an interesting species from Chanchamayo in Peru, which strongly resembles lalUix. 

 Cerutinia bicolora and scviifulva, as well as the larger Mechanitis deceptus and Melinaea niotlione, by the black- 

 wings with broad red-brown bands. But it may be recognised, apart from the neuration, by the long, thin black 

 antenna and the differently placed black spots situated at the end of the cell and in the cell of the forewing. 



H. aesion Godm. d- Salv., from Panama, is similar to aliida. smaller, without th(^ white marginal dots aesion. 

 and without the median band on the hindwi)ig. 



H. illinissa Hew., from the Upper Amazon, is similar to the preceding, with larger white spots and an ilUnifisa. 

 additional one in the cell of the forewing. The red-brown hindwing h;'s in addition to the dark border a lihick 

 submarginal band, curved correspondingly to the distal margin. 



In H. similia H.-Sc)bdff. (38 d) the whole base of both wings is black brown like th<^ hindwing; on the slmilia. 

 hindwing remains only a yellow-brown submarginal band at the distal margin. 



25. Genus: L<eucotlij-ris Bdv. 



This genus is as at present constituted rather extensive and might better be divided into several subgenera. 

 Externally two principal groups are already differentiated: the first has shorter, rounded wings with broad whitish 

 bands, often also with red-brown colour, especially at the apex of the forewing. The second has more pointed 

 apex and peculiar whitish macular marking, especially at the apex and at the distal margin of the forewing, 

 without brownish colouring. In the neuration, however, both forms fluctuate between the typical short Hypo- 

 scada-ceW of the hindwing and long thin antenna and long cell and shorter antenna with distinct club. In typical 

 Leucothyris the costal and subcostal are said to run close together. The cell of the hindwing in the q is longer 

 anteriorly than posteriorly; the middle discocellular longer than the upper. 



Considering tlie large number of forms which belong here it is not sui'prising that representatives of the 

 genus are found in the whole Neotropical region ; but as in most Ithomiids, the eastern slopes of the Andes from 

 Coloml)ia to Bolivia produce the greatest abundance of forms. The range of distribution of the separate forms 

 is mostly very restricted. Almost every large river-valley has its distinct local form, which sometimes occurs 

 there in great abundance, but a few hundred metres higher or lower, or about 10 miles to either side, is no longer 

 met with. 



On this account some forms of this and other genera remain for decades great rarities, until the restricted 

 locality is at last revisited by some collector, who then obtains the coveted species in al)undance. 



L. ida Hsch. (38 d), from the Upper Napo in Ecuador, has black wings with milky vitreous spots and ida. 

 a red-brown submarginal band on both wings. The latter is very broad in the apex of the forewing, as is also 

 the case in a large number of similar forms, ida is distinguishable especially by the two white dots in the apex 

 of the forewing, moreover the forewing has four white spots and a triangle at the base. The hindwing has 

 a large whitish discal longitudinal band. In the J the spots and band are smaller. — idina Hsrli. is a smaller local idina. 

 form from the Upper Amazon with indistinct dots in the apex of the forewing and broadei-. light red-brown apical 

 band. Moreover, on the hindwing the red-brown submarginal band is lighter and broader. — kena Hew., from kena. 

 eastern Ecuador, is considerably smaller tlian ida. The two vitreous spots at the apex of the forewing are con- 

 fluent and completely enclosed by the red-brown subapieal band. At the end of the cell three vitreous spots form 

 an obhque band and the other three spots are also larger. — In ilerdinoides Sigr. (38 d) the two vitreous spots ilerdlnoides. 

 at the apex are absent, on the other hand there are two at the end of the cell. The red-brown subapieal band 

 of the forewing is broader. — Another similar form, which I call lerda form, nov., differs from the preceding in hrda. 

 having only one spot at the end of the cell of the forewing, on the other hand there is another at the lower angle of the 

 cell in the disc. These forms fly on the Upper Amazon, but each of them probably occurs in a separate district. 



Whilst the preceding forms have a short cell, like Hyposcada, in the following, otherwise very similar 

 forms, the middle discocellular of the forewing, and hence also the cell, begins to be apppreciably longer anteriorly. 



Y 19 



