THALASS0DE8; PRASINOCYMA. By L. B. J^kout. 
24. Genus: Tlialassotles 
A very homogeneous group of ludo-Australiau and African Heinitheinae with most of the charactei’s 
of Gelasma, but the discocelhdars of the hindwing extremely oblique, so that the cell is at least 1 14 times as 
long posteriorly as anteriorly. The wings are generally more or less sti'igulated with white, as in tyj)ical 
Prasinocyma. The African species have the venation of the fore wing usually more specialised than the Indo- 
Australian, the 1st subcostal arising from the end of the cell or from the stalk of the other subcostals. 
T. unicolor Warr. is only definitely known in a series of not very perfect $$ from Southern Nigeria, miicolor. 
hence it is difficult to say whether it may not prove to be a form of digressa or whether my dentatilmea may 
be a form of it. Size as in the larger $-fornis of digressa, palpus perhaps very slightly longer; distingiushed 
by the obsolescence of the white lines and, on the hindwing, of the white cell-mark. Fringes ap])arently white 
proximally, not yellow. Aurivillius has recently recorded from Fernando Po a Thalassodes which he believes 
to the referable here and Mr. T. A. Barns has taken a similar one on Sao Thome. 
T, dentatilinea Prout (3 c) is perhaps merely a form of the following, with strongly expressed, strongly (/(’/(/(/n/i/a'a. 
dentate bluish-white lines, but as the wings are not quite so robust and the hindwing appears somewhat more 
sharply angled in the middle I am not yet prepared to sink it. Known from Sierra Leone to Nigeria, the type 
being from the latter country. 
T, opaca Warr. is a small species (20—29 mm), of a rather opaque blue-green colour, with the costal upucu. 
edge and the fringes yellow. Hindwing quite weakly angled at the 3rd radial. Lines bluewhitish, as in 
dentatilinea, but more slender and indistinct, sometimes almost obsolete. Apart from the type $ and 3 other 
examples from Warri, S. Nigeria, I only know a $ from Bingerville, Ivory Coast. 
T. digressa Walk. (=- ricinaria Cbtew., chlorinaria Mab. aequaria Mah., subreticidata Mab., sapoliaria diijrc.-^tiu. 
Swinh.) (2 h). By far the commonest African species of Thalassodes. Very variable in size. Distinguished from 
all the preceding by the straight white postmedian line of the forewing. Palpus scarcely so long. Angle of 
hindwing moderate. Face red, as in all the Continental African Thalassodes yet known. Occurs almost through 
out Trojhcal Africa and southwards to Durban, also on the Comoro Islands, Madagascar, Reunion and Mauri¬ 
tius. It has been bred from Ricinus. Larva very slender, green, with sharply bifid head and bright red dorsal 
line. Pupa slender, greenish (Guenee). 
T. progressa Prout (3 c). Much like a darker, duller, blue-green digressa with the lines nearly obsolete, progressa. 
but distinct from all the African Thalassodes in having a hair-pencil on the G hindtibia. Palpus longer than 
in digressa. North Madagascar. single G fi’om Uganda, with similar structure, probably represents a race. 
T. hyraria Guen., founded on a single, somewhat mutilated $ from Reunion, differs from all the hyrurla. 
preceding in its bright green face. Palpus long. Wings blue-green, rather strongly strigulated with white, the 
lines on the forewing almost entirely obsolete, the postmedian of the hindwing well traceable. Hindwing with 
the angle at the 3rd radial l.)lunt. 
T. ( ?) ostracites Karsch is only known in the $, and I suspect that the discovery of the q will show oiitracites. 
it to be congeneric with Hemisfola albisficta Warr. which it closely resembles in colour and markings. The 
face, however, is red, not green and the terminal joint of the palpus is strongly elongate; moreover the hindwing 
is rather more acutely angled and has the discocellular almost or quite as oblique as in Thalassodes. Madagascar, 
onlj^ two specimens known to me. A race (?), also only known in two $$, occurs at Nairobi. 
25. Genus: l*rasiiiocyma Warr. 
The typical group of this very extensive genus belongs to Africa and is here very rich in closely allied 
species. Probably many are still confused in collections, while on the other hand it is not unlikely that some 
of the supjiosed differential characters of species — presence or absence of a cell-dot or on the forewing of a 
hindmarginal white spot — are in some cases varietal only. To facilitate sorting them by these characters, we 
have arranged the more difficult species in corresponding order: 
\V i n g s \v i t li o u t li i n d m a r g i 11 a 1 spot or black c e 1 1 - d o t s *): Iranqiiilla to punchlora. 
W i 11 g s w i t li li i n d m a r g i 11 a 1 spot b t w i t'h out black cell -dots: chloroprosopa to albhiotafa. 
Wings w' i t h black c e 1 1 - d o t but with o u t h i n d ni a r g i n a 1 spot: najlstrigida to dohcrti/i. 
Wings with bin d ni a r g i n a 1 s p o t: (unless in celhdaria) and black c e 1 1 - d o t s: nigrlDiuctda to 
(jajdacsi. 
The genus may be regarded as the centre of the group in which the frenulum is present in the <5' but 
obsolete in the $ and contains all the species which present no outstanding peculiarity of sha})e or structure. 
*) Only in veiauiculariu with minute black cell dots at times present. 
