OXYAMBULYX. By Dr. A. Seitz. 
533 
cell-end figure is straighter and thicker; the brown marginal band uniformly tapers off at both its ends; the 
black line bordering on it lacks the tooth above the centre, the olive brown proximal shadow of this marginal 
band is much broader and more uniformly rounded, the black discal band is obliquer, almost parallel to the 
margin, crossing the subcostal system before the 5th subcostal branch. From Tondano (Celebes). - Another 
form or species, niousoni Clk., has remained unknown to me. Larva green or pink, on the dorsum yellowish, nwusoni. 
with thin yellow lateral oblique stripes the last of which passes over into the very thin, somewhat 8-shaped 
horn of 2 cm length. On Mango, according to Mell more frequently on Dracontomelum mangiferum, Rhus, 
or Garcinia. Pupa large and thick, somewhat like that of an Ach. atropos, the cover of the proboscis extends 
to the end of the wing-cases, though it does not project. - - From Southern China through India to Ceylon and 
the Andamans, to the east over the Sunda Is. to the Philippines. I found the species in Hongkong and in 
Kandy (Ceylon), but not frequently. The imagines sit with their wings spread, so that the anal third of 
the hindwing is to be seen. The frequently lighter median area of the forewing extends like a broad stripe 
across the insect, whereby it is hardly to be recognized *), the abdomen being upturned. I took the lepidoptera 
only by the lantern round which they circle in a slow, floating flight, as the European Marumba do. Although 
the 3 cm long proboscis might penetrate even into flowers with deep calyces, I never saw a specimen on blossoms. 
17. Genus: Oxy«ml>ialyx R. & J. 
The genus is easily recognized by the slender structure, the long forewing terminating in a falciform 
apex, and the hindwing showing a somewhat irregular margin. All the species are very much alike, so that the 
various forms have often been mixed up; they vary from brown to yellow, before the margin of the forewing 
there is an antemarginal stripe proceeding from the apex, and in the submedian area there is almost invariably 
near the base a dark round spot. The larvae are very much alike; they have a large head which is above very 
pointed and is attached to a neck which is bent like a snake (S-shaped) in the resting insect; they are mostly 
green, more rarely yellowish-brown, with lateral oblique stripes and from the head to ring 4 with stripes on 
the sides; they are relatively thin and feel hard; they live on trees and are mostly monophagans or oligophagans. 
Pupa of about the shape of that of Smerinthus, but the abdominal part is somewhat thinner, flatter; the cover 
of the proboscis extends to the end of the wing-cases. The imagines rest with somewhat laterally spread wings 
on trunks, boards, or leaves; they come to the light, though not so frequently as their American representatives, 
the Amblypterus. I never found them on flowers, but according to Mell they also visit certain kinds of blossoms, 
though rarely. 
0. sericeipennis Btlr. (= substrigilis Hmps. p. p.) (61 a). Forewing greyish-brown, somewhat variable, sericeipen- 
hindwing as in most of the Oxyambulyx orange, darkened by red-brown and greyish-brown. The submarignal 
stripe of the forewing is very near to the margin which it approaches at the lower median branch as far as 2 mm, 
and withdraws again a little from it on the submedian vein. Beneath this is more distinctly prominent; about 
1 cm from the base of the wing above usually a flat costal dark spot and a roundish submedian one. The ground¬ 
colour of the forewing is mostly dusty greyish-brown. — In brunnea Clark, which name presumably refers mostly brunnea. 
to summer-insects, the colour of the forewing is darker brown, and the shadow-like dentate stripe through the 
centre of the wing is strong and conspicuous. - reducta Mell are lighter insects in which the costal subbasal reduda. 
spot and the one in the submedian area are greatly reduced, the latter even being often entirely absent. - 
Larva light bluish-green with broad, whitish, above green-shadecl oblique streaks and a straight thin horn; on 
Myrica rubra, Elaeocarpus chinensis and species of Quercus. — The lepidoptera are distributed from South 
China through India and Indo-China to Malacca, being not particularly rare in many districts, e. g. in Sikkim. 
0. citrona J . A T. is allied to sericeipennis (61 a) from which it forms the transition to schaujfelbergeri citrona. 
(Vol. II, pi. 37 a). In the forewing the central dot is rather distinct, like the four lines before the interior angle. 
Hindwing pale yellow, marginal shadow-like band distinct and also a spot right before the apex very conspicuous. 
Abdomen with a dull dorsal line. Sabathu in North-West India. 
0. placida Mr. (— substrigilis Hmps. p. p.) (61 b). Extremely similar to the preceding ones, but the placida. 
apex of the forewing more produced; the submarginal stripe is more remote from the margin, especially right 
below the apex and above the anal angle. The dark spot in the submedian area is often very large, whereas 
the costal subbasal spot may disappear save very faint traces. Hitherto only known from North India. 
0. bima R. & J. This species is unknown to me in nature, -fudging from the figure of the only specimen bima. 
from Sumbawa the submarginal stripe extends as in sericeipennis, but the forewing is more fawn-coloured, 
the marking softer, more faded, and the subbasal spots are both very large. 
*) As the centre of the body, i. e. the dorsum of the abdominal rings 1—1 harmonizes with the central area of the 
forewing and is likewise coloured sometimes lighter and sometimes darker, the resting insect looks as if a more than 1 cm broad 
streak had been put across the body and wings. On this light area the cell-end figures look like the eyes of an animal. The 
upturned abdomen then represents the snout belonging to that animal. 
