910 JOURNAL, BOM BAY NATURAL HIST. SOCIETY, Vol. XXVIII 
times ; loop with 15-16 cells ; 4-5 rows of cells between Rs and Rspl : membiane 
absent ; anal triangle with 3 cells. 
Abdomen olivaceous green and brown, marked with darker brown and black 
apical rings towards the end of the segments. The 1st and 2nd .segments are 
broadl}' green on the sides, the oreillets are large and bear 5-6 robust spines on 
the hinder border. 
Superior anal appendages long and slender, the outer border nearly straight, 
the inner slightly sinuous and coated with long black hairs, the apex bevelled 
outwards and ending in a small point. Inferior appendage triangular, nearly 
half the length of the superior, curled up strongly. 
The single male specimen of this in.sect was sent to me by Mr. H. V. O’Donel 
whom it is named after, from Hasimara Tea Estate, Duars, Bengal. 
It bears a close resemblance to G. millardi but is very much smaller. The 
3rd abdominal segment is also much more constricted and the wings 
are deeply enfumed. In size it is equivalent to the smallest known Gynacantha 
saltatrix hut the relative sizes of abdomen and wings differ, being 42 to 35 mm. 
in saltatrix, to 41 to 39 mm. in o'donelU. It differs again by ha\dng the upper 
surface of frons unmarked. 
Gynacantha hyalina, Selys. Bull. Acad. Belg. (3) V., p. 19 (1882). 
Acanthagyna hyalina, Kirby, Cat. Odon., p. 95 (1890.) 
Gynacantha hyalina, Kruger, Stett. Ent. Zeit. p. 275 (1899) ; Laid. Rec. 
Ind. Mus., Vol. XXII, p. 90 (1921) ; Martin. Cat. coll. Selys. fasc. 
XIX, XX, pp. 198-199, (fig. 203) (1909). 
Male. Abdomen 52 mm. Hindwing 42 mm. 
Female. Abdomen 56 mm. Hindwing 51 mm. 
Male. Head entirely olivaceous, the frons only being marked with a thick, 
black “T” above. 
Prothorax and thorax olivaceous brown in front and on dorsum, olivaceous 
on the sides, yellow beneath. 
Abdomen blacldsh brown above, reddish beneath. The dorsal carina and 
articulations black. The 2nd segment bears very large oreillets, rounded 
behind and furnished with small teeth. The 3rd segment markedly constricted. 
Legs slender, reddish brown, the femora darker at the distal ends on the 
inner side. 
Wings hyaline, slightly enfumed and tinted with brown at the extreme base. 
Reticulation dark reddish, the costa brownish yellow. Stigma yellow, medium 
size, 0‘3 mm, over 4 cells. The hindwing very broad, the membrane rudimen- 
tary, pale grey. 18 postnodal nervures and 24 antenodals to the forewing. 
Superior anal appendages black, furnished with long hairs on the inner side 
before the apex, longer than the 9th and 10th abdominal segments together, 5 
mm. straight, very slender, nearly cylindrical, a little thickened before the apex 
which tapers to a sharp point very slighth' inclined outwards. Inferior appen- 
dage subtriangular, blunt, a little more than one-third the length of the 
superior. 
Female. Similar to the male but the body and legs paler, the abdomen not 
constricted, the oreillets nearly absent. Stigma 4 mm. in length. Anal appen- 
dages broken, shape doubtful. 
Hab. Bhamo (June, July and August). Nilgiri Hills from 1,000 to 7,000 ft. 
This species varies much in size, the adults ate often enfumed as regards the 
wings and the antenodal nervures vary from 24-36 in the forewing. Sylhet. 
China, Loo-choo, Lucon, Borneo. The species is very similar to subinterrupta 
but there is no basal marking in the hind wings of hyalina. 
{To be continued''. 
