288 lA'CJESIDJK. 



have observed the habits of a small plain butterfly which 1 caught 

 in Maymyo. I watched it often in the jungle, sometimes for an 

 hour at a time. It puzzled me at first to know why it took such 

 an immense time to settle. It would keep within one yard of a 

 spot and almost settle, twenty times perhaps, before it actually 

 did. Its legs are immensely long, and I discovered why. It 

 settles over a mass of Aphides and then tickles them with its 

 proboscis, just as ants do with their antennae, and seems to feed 

 on their exudations. I have not made the butterfly big enough 

 nor the ant *, and its legs are not long enough. But it would 

 settle calmly over largish ants and did not mind one or two 

 actually standing up and examining its legs to see who was there. 

 The ants did not attack it in any way." 



So far as I know this is the first recorded instance of butterflies 

 being in attendance on Aphides as ants often are. 



The subfamily Gerydince contains three genera, the differences 

 between w hich may be tabulated as below. 



Key to the Genera of the Gerydinae. 



A. Legs abnormally long ; tibiae of usual form. 

 '. First joint of the tarsi elongate, compressed 



and flattened GERYDUS, p. 288. 



b'. First joint of the tarsi elongate, but not 



compressed, cylindrical ALLOTINUS, p. 290. 



Pi. Legs normal, short; tibiae outwardly incrassate. LOGANIA, p. 302. 



Genus GERYDUS. 



Gerydus, Boisduval, Sp. Gen. Lip. i, 1836, pi. 23, fig. 2 ; Distant, 

 Rhop. Malm/. 1884, p. 205; de Nicevillc, Butt. Ind. iii, 1890, 

 p. 21. 



Miletus, pt., West-wood (nee Hubner) in Doubkday, Westwood $ 

 Hewitson, Gen. Di. Lep. ii, 1852, p. 502. 



Type, G. symethus, Cramer, from the Malay Peninsula. 



Ranrje. The Indo-Malayan Eegion. 



<S $ . Fore wing : elongate, rather narrow ; costa widely arched ; 

 apex acute, in c? at times slightly produced, in $ not produced ; 

 termen convex, more so in the $ than in the J ; tornus in c? 

 acute, slightly produced, in $ not so acute ; dorsum bisinuate. 

 long, more than three-fourths the length of costa ; cell closed, 

 but the discocellulars very slender and faintly marked ; vein 5 at 

 base equidistant from veins 4 and 7 ; vein 6 from underside of 7 

 beyond apex of cell, upper discocellular therefore absent; vein 8 

 absent; vein 9 from middle of 7; vein 10 from subcostal, a little 

 before apex of cell ; vein 11 from subcostal, at base closer to apex 

 than to base of cell ; vein 12 terminates on costal margin opposite 

 upper apex of cell. Hind wing : elongate, pear-shaped ; costa 

 arched near base and apex, more or less straight in middle ; termen 

 rounded, curved, in $ angulate at apex of vein 4 ; tornus rounded; 

 dorsum nearly straight ; cell short, discocellulars more or less 

 obsolescent ; vein G from 7 beyond apex of cell ; vein 8 long, 



* Col. Barrow refers to a sketch be sent me. 



