1903.] E. P. Stebbing— Life-history of Arbela tetraonis. 253 



Mr. De Niceville and is labelled Calcutta 1891. It is the only re- 

 presentative of the Arbelidse in the Museum Collections. The genus 

 Arbela has a fairly wide range, inhabiting, according to Hampson, 

 Peninsular India, Ceylon, and Burma. 



The species here described appears to infest most of the Casuarina 

 plantations on the Madras Eastern Seaboard. Hampson records it only 

 from Poona, Bombay, and Baipur. 



Hampson gives the description of the genus as follows : Palpi minute? 

 antenna bipectinated to tips in male, the branches short, simple in female. 

 Mid and hind tibise slightly hairy with terminal pairs of spurs. Fore- 

 wing with veins 7, 8, 9 stalked together. Hindwing with cell of normal 

 length ; vein 6 given off below the angle ; vein connected with the sub- 

 costal nervure by an oblique bar near centre of cell. 



Arbela tetraonis, Moore, P.Z.S.," 1879, p. 411, pi. 34, %. 3 ; C. & S., 

 No. 1605 ; Hampson. F. Br. Ind. Moths I. 315, No. 675, (9 ). 



cf Head and thorax covered with long silky brown hairs. Abdo- 

 men with long greyish hairs. Forewing greyish, thickly irrorated 

 with dull-brown spots which tend to form transverse bands ; three large 

 velvety-brown patches, one centrally, placed a little below the costa, a 

 second near the base of the wing, and the third, the largest, a little 

 beyond it. 



Hindwing grey irrorated with a few ashy-coloured spots and a 

 dark marginal band, Exp. 43 millim. 



$ Already described by Hampson. 



Larva. Head black with a few longish yellowish-white hairs on it. 

 Following three segments, which each bear a pair of long legs, yellowish, 

 this colour merging into pink on the third. These three segments are 

 swollen and larger than the head. The following segments are flesh- 

 coloured except the last which is yellowish. Five pairs of short sucker 

 legs are present, one pair each on the 6th to 9th and a pair on the last 

 segment. A few long scattered whitish hairs on each of the segments. 

 These nine segments are narower than the first three [and taper off 

 slightly behind so that the 12th segment has only about the diameter 

 of the 4th. Length \". Width of thoracic segments 3-16ths inch. 



Pupa, Yery shining, yellowish-brown merging into black at an- 

 terior end. Circular in section and of uniform thickness throughout 

 except for a slight swelling at thoracic end, which is furnished at the 

 top with two small spiny spikes ; the last segment tapers bluntly. 

 Wing covers short, shining yellowish-brown posteriorly merging into 

 black above. Abdominal segments visible, 7 to 8 dorsally, 5 ventrally. 

 The last 5 bear transverse circular rows of fine saw-like closely set black 

 teeth upon them, the first three segments having a double row placed 



