68 DIURNAL LEPIDOPTERA. 



Genus TRICHONIS, Hewitson. 



Head rather large ; eyes smooth. Palpi short, smooth, slender, embracing the head : the 

 terminal joint short, pointing outwards (of the same length in both sexes). Antennae rather 

 short, many-jointed, the club long. 



Anterior wing with the costal margin rounded near the base ; outer margin slightly curved 

 outwards, at a right angle with the costal margin ; inner margin curved outwards as in Euplcea, 

 and covering a polished surface on the posterior wing. Costal nervure extending to a little 

 beyond the middle of the margin ; subcostal nervure at a distance from the margin, with two 

 branches, both before the end of the cell ; discoidal cell half the length of the wing, closed 

 obliquely by the disco-cellular nervures, the first short, the second twice as long, the third 

 twice as long as the second, joining the third branch of the median nervure a little beyond its 

 base. 



Posterior wing very round, especially in the female, its costal margin projected outwards 

 near its base ; the discoidal cell short. 



Fore legs of the male of very unusual form, the tibiae and tarsi of equal length, smooth ; the 

 tarsi exarticulate, robust, and broad beyond the middle. Fore legs of female of the usual form, 

 jointed and spined. 



Trichonis Theamis. Plate XXIX. figs, dl, 3, 9 2. 



Papilio Theanus, Cramer, pi. 139. f. E. 



Aricoris Theanus, Westwood, Gen. Diurn. Lep. p. 450. 



In the Collection of W. C. Westwood, from Cayenne. 



To the kindness of Dr. Boisduval and Dr. Kaden of Dresden I am indebted for the pleasure 

 of figuring this rare and extraordinary insect. Any one judging from appearance only, would 

 reverse the sexes and consider figure 2 as the male, or believe them to be both of that sex, 

 since each of them have the polished surface where the wings meet, peculiar to the males only 

 of other genera. 



