OF THE AMAZON VALLEY. 519 



terminates on the outer margin; tin- lower disco-cellular is jilaccd at a rii^lit aunle with 

 the median, is much longer than the middle clisco-eellular (which is straight), and 

 strongly angulated. The fore legs of the male have the tihite and tarsi linear in shape, 

 althou"-h much shorter than the femur; they ditler in length in individuals of the same 

 species, hut are never so far ahorted as to form a mere round knol) at tlie tip of tin- 

 femur, as in Thyr'uUa. In TInjridia the lower disco-cellular is short and straight, and 

 placed at an ohtuse angle with the median, whilst the middle disco-cellular is very long 

 and ano,-ulated; and the internal (ahdominal) nervure is short, terminating on the 

 al)dominal l)order. 



1. Metiiona TuE^nsTO, lliihner. 

 Thyridia Themisto, Iliibu. Zutriig. f. 1G3-1. 



I found this species at Para, where it was associated with 31. F^idii. Like the oilier 

 species of the genus, its ilight is somewhat slow and heavy. It freciuents thinned ])arts 

 of the virgin forest, moving about the lower trees and underwood. It dill'ers from 

 M. Psklii, principally, in the absence of a black belt across the disk of the hind wings. 

 It is pr(jbably a modiiicatiou of it. 



2. :METnoXA PsiDii, Linnanis (PI. LVI. flg. 8(/). 



Papiiio Psidii, Linnanis, sec. Cramer. 

 , Cram. Pap. Exot. t. 23/, f. F. 



ilr. Doul)leday and all subsequent authors have considered the P. Fsidii of Liiuueus 

 and Cramer to be a Thyridia. I cannot imagine how their mistake has arisen, all the 

 numerous examples of the insect represented by Cramer as 1\ Fsidii which 1 ha\-e 

 examined having the wing-neuration and male fore legs of Jfcl/ioua. It is an 

 exceedingly common insect throughout the Amazon region. The liuure of Cramer is 

 accurate: the small, rounded shape of the hyaline area lu^ar the tip of the hind wini;', 

 crossed by two nervurcs only, and the opake black colour of the l)asal part of the hind 

 margin of the fore wing reaching the median nervure (both good speeilic characters), are 

 well given. The colour of the tlun-ax: varies in almost every speciuuMi. In all there is 

 a round grey spot on the wing-lappets; but in some examples the edges of these t)rgans 

 are also grev, and in others the surface of the thorax is much variegated with grey colour. 



Genus TiiviMDiA (niibner), Dcniblcday. 

 Doublcl. ami Ilewits. (Jen. Uiurii. Lep. p. 117- 



TiiTiiiDiA Ixo, Felder. 



Thyridio Ino, Feld. Wicn. Eiit. Moiiatschr. ISfl'J, ]>. 75. 



I found this species at Villa Nova, on the Lower Amazons, in c()in])any with McUiona 

 Psidii. Dr. Tclder's specimens came from the Up])er Rio Kegro. It is distinguishable 

 from J/. PsitZ« at once by its structural generic characters, as will be seen from the 

 description above given of the genus Jlelhona; \m\ in size and colours the two rcscinblc 



VOL. XXIU. I A 



