218 Dr. A. Giinther on Reptiles and Fishes 
Ornithoptera flavicollis was very common at one place on 
the River Tinkyo, where I camped all May 1888. The male 
seems to be the wooer, but of this I am not quite certain yet. 
This insect has one peculiarity of flight which may be used in 
courting and is certainly used on other occasions. As I have 
not seen it noticed in books and have had many opportunities 
of observing it a description may be useful. 
The male in basking along the foliage on sunny river-sides 
often flies slowly along, moving only its fore wings, the hind 
wings drooping at an obtuse angle to the line of flight, trailing 
like a rich robe of golden silk. In a freshly caught specimen 
this position can easily be induced. A furrow in the mner 
margin of the fore wing allows the notch of the hind wing to 
be elevated easily without interfering with the partial action 
of the fore wing. In such flight the fore wings only move 
through a small angle. 
On the inner margin of the hind wing there is a strong 
fold fringed with hairs, forming a pouch. In normal flight 
and when at rest this pouch is closed, but when the hind wing 
is drooped the pouch opens. It may therefore be a scent- 
pouch and this peculiar flight the normal courting flight. 
As a rule it is only where butterflies are plentiful that the 
various kinds of flight can be studied, and this seldom happens 
in North Borneo. When it does it is always in broken 
weather, rain and sunshine, and on the open banks of large 
streams. Very dry weather produces few insects and many 
of them crippled; very wet weather prevents any butterflies 
from appearing. 
XXIV.— Third Contribution to our Knowledge of Reptiles and 
Fishes from the Upper Yangtsze-Kiang. By Dr. A. Gin- 
THER, Keeper of the Zoological Department, British 
Museum *. 
t 
Mr. A. E. Prart has continued to collect at Ichang. The 
last collection sent by him consisted chiefly of Reptiles, some 
Batrachians, andafew Fishes. Species not represented in his 
previous collection were the following :— 
REPTILES. 
Eumeces xanthi, sp. n.; Japalura yunnansis, Anderson; 
* For the two previous communications see this Journal, 1888, vol, i. 
pp. 165, 429. 
