LY CANID. GERYDUS, 21 
The first division which I make in the Indian Zycenide I have called the Gerydus group, 
and is the same as Mr. Doherty’s subfamily Gerydine, but with the addition of the genus Logania, 
Distant. Mr. Doherty states that the Gerydine are distinguished in all the species he has exa- 
mined “by the extraordinarily flattened egg,” which is ‘less than one-third as high as_ wide, 
delicately and sometimes obsolescently reticulate, sometimes carinate, flat above and below.” 
The group is also distinguished “ by the curious structure of the prehensores, the clasps 
[bifid uncus] being very long, broad, thin and plate-like, somewhat resembling the ‘ valves’ of 
the Pafilionide.”* But the chief peculiarity of the group appears to me to be the very long legs, 
which in the first of these three genera Professor Westwood described as being “ slender, scaly’, 
compressed; the tarsi of all the feet with the basal joint remarkably elongated, widened, and 
quite compressed ; the tarsus in the forelegs of the male being exarticulate, and as long as 
the femur and tibia united : second, third, and fourth joints in the four hindlegs very short, 
terminal joint small, subovate, notched at its obliquely truncated extremity, with extremely 
minute ungues.’¢ In Adlotinus and Paragerydus the legs are still very long, but the first joint 
of the tarsus instead of being flattened is rounded. The elongation of the tarsus necessarily 
renders the legs as a whole very long; they are indeed longer in Gerydus, Allotinus and 
Paragerydus than in any other group of the Zycenide known to me. It is probable that 
this group includes the genus AZi/efus of Hiibner, of which the Papilio polycletus of Linnzeus 
from Amboina is the type. As I have not seen this species, I cannot say with certainty 
whether or not it is of this group; but Mr. Kirby in his ‘‘Synonymic Catalogue,” p. 378, 
places it in the genus Aypochrysops of Felder, which includes very different insects, that 
are apparently more nearly allied to species of the genus Poritia, Moore, than to the butterflies 
of this group. The male of Afiletus polycletus, as figured by Cramer, is rich blue on the upperside, 
quite different from the dull brown and white butterflies included in the three following genera 
of this work. These genera, which alone possess the greatly elongated legs, have their 
head-quarters probably in the true Malayan region, and may certainly be said to be confined 
to the Indo-Malayan region. In India they are found in the North-East Himalayas only, 
extending southwards into Burma. - The males have no secondary sexual characters, 
Genus 95.—GERYDUS, BoispuvaL (PLATE XXVI). 
Gerydus, Boisduval, Sp. Gén., vol. 1, pl. xxiii, fig. 2, Gerydus symethus, Cramer, female imago; 2a, 
tarsus of foreleg of female; 2b, ditto of male (1836); id., Distant, Rhop. Malay., p. 205, with woodcut 
of posterior leg of Gerydus symethus (1884); Symetha, Horsfield, Cat. Lep. E. I. C., p. 59, pl. ii, fig. 2, zago 
of Symetha pandu, male; 2a, female ; 2b—t, structure of imago (1828) ; Miletus, Westwood (part, zec Hiibner), 
Gen. Diurn. Lep., vol. ii, p. 502 (1852). 
** FOREWING, elongate and ovate, costal margin arched and convex, apex subacute, ozter 
margin obliquely convex, zz#er margin nearly straight, very slightly concave; sadcostal 
nervure with four nervules, first subcostal nervule emitted about one-fourth before the end of 
the cell, second near the end of the cell, ¢4zrd a little beyond the cell, fourth minute, starting 
from the third a little before the apex. HINDWING, elongate and ovate, costal margin 
nearly straight, fosterior margin convexly rounded, distinctly angulated in the female. Zyes 
naked ; palpi very long, terminal joint long and slender ; /egs scaly and compressed, the first 
joint of the tarsi remarkably elongated, widened and compressed ; astenne slender, terminat- 
ing in a slightly-formed club.” 
“This is a truly remarkable genus, the enlarged and widened basal joint of the tarsi 
being a phenomenal character in Rhopalocera. The focus of the distribution of Gerydus 
appears to be in the true Malayan region.” (Distand, 1. c.) 
In the forewing the inner angle is sometimes much produced and hook-like, the costal ner- 
vure extends to a little beyond the end of the discoidal cell, the first subcostal nervule is given 
* Doherty, Journ. A. S. B., vol. Iv, pt. 2, pp. r10, 132 (1886). 
t+ Genus Miletus, Westwood, Gen. Diurn. Lep., vol. ii, p, 502 (1852). 
