230 
PHILOTHERMA. By Dr. C. Aurivillius. 
simplex. 
brunnea. 
fusca. 
dentata. 
spargata. 
I append here the following species described from a damaged specimen. 
Ph, simplex Wichgraf. Without any markings. The silky gloss is here still more intense (than in Ph. 
flavescens), and the dull creamy colour of the forewing exhibits in some places a silvery white reflection. Kindwing 
reddish-brown, particularly towards the base with a hue on it. Body and antennae yellowish-brown; eyes 
greyish-brown. Under surface reddish-brown with slight traces of a discal band from which the colour turns 
somewhat darker as far as the base. The contours of the wings are characteristic, appearing truncate, so that 
the difference between the costal margin and the anal margin is smaller. Expanse of wings: 67 mm. Ivilima- 
Njaro. 
Second Group of Species. 
Both the transverse lines of the forewing above distinct, quite smooth, not dentate. Anterior tibiae unarmed. Distal 
margin of forewing almost entire, of hindwing undulate. Fringes very long. Eyes bare. Palpi entirely as in Ph. rosa below 
densely long-haired. Vein 9 of forewing almost terminates into the apex of the wing. 
Ph. brunnea Auriv. (31 b) was described as a Bombycopsis and resembles also in the exterior the 
species of that genus and those of Olyra ; but as the fork of the veins 9 and 10 in the fore wing is very short and 
the eyes are bare, the species must belong to the genus Pliilotherma. Only the $ is known to me. Fore wing 
above dark red-brown or fawn-coloured with blackish transverse lines; the first transverse line is bent distally 
convex; the second transverse line is more strongly bent at ,the costal margin, then feebly bent; discal dot 
small, black, sometimes indistinct; submarginal dots black, separate, arranged in an almost regular arcuate 
row. Hindwing above lighter brown or fawn-coloured with a fine curved dark discal line and an indistinct 
submarginal line or separate submarginal dots. Both wings above and beneath in the marginal portion more 
or less speckled with black scales, beneath with a joint bent discal line and somewhat lighter ground-colour. 
Expanse of wings: 40 to 45 mm.. Nyassa Land. 
Third Group of Species. 
Palpi slender, projecting a little beyond the frons, scantily haired, with a distinct oblong terminal joint. $ without 
anal wool. Vein 9 of forewing into the apex of the wing. 
Ph. fusca Auriv. Everywhere dark (blackish) brownish-grey. Antennal pinnae as well as the legs 
and the abdomen beneath brown or brownish. Forewing above with a normal, though rather inconspicuous 
marking; the fust transverse line is slanting, almost vertical to the costal margin; discal dot small, uni-coloured 
black; the second transverse line uniformly bent from the costal margin to the anal margin, towards the distal 
margin indistinctly bordered with light, at the anal margin very near to the first transverse line or almost touching 
it; the sub marginal spots are black and situate somewhat nearer to the margin than usual, in a uniformly bent 
row parallel with the margin. Hindwing with an indistinct nebulous postmeclian band. Both wings beneath dark 
grey without markings or only with traces of dark bands. Sexes similar to each other. Expanse of wings: 
50 to 52 mm. Nyassa Land. 
Fourth Group of Species. 
By the distal transverse line of the forewing above being distally dentate and composed of bows or little crescents, 
the species of this group are at once distinguished from those of the first three groups. In the species which I examined 
the anterior tibiae are unarmed. Margin in both wings dentate or at least distinctly undulate. 
Ph. dentata Auriv. (31 c). $. Forewing above with a black discal spot. Margin of both wings dentate. 
Wings above with a light yellow, beneath whitish ground-colour, above for the greatest part speckled with 
black scales. Hindwing on both sides at the hind-margin broadly white or whitish without markings. Forewing 
beneath only at the apex and distal margin somewhat speckled and with submarginal spots. Vein 9 of forewing 
into the apex of the wing. The figure makes any further description superflous. $ unknown. It is questionable 
whether it is the $ of Ph. spargata Holl. Congo District. 
Ph. spargata Holl. By this name I combine some closely allied forms which are probably only races 
or aberrations of the same species. The forewing shows a roundish white discal spot, and at the costal margin 
between the distal transverse line and the apex of the wing a whitish spot or a large, indistinctly defined whitish 
brightening. Margin in both wings very undulate. Only $$ are known. — spargata Holl. (= spargatana Strd.) 
(35 e) is the form described first. It has light chestnut-colom'ed palpi which are outside dark brown, a pale 
reddish frons; a brown collar being inside and outside bordered with dark brown and reddish shoulder- 
covers. Thorax and abdomen above light reddish; legs rust-coloured with black tarsi. Fore wing above dark 
brown, the basal portion and a broad marginal band from the apex to the hind-margin are light rust-brown; 
these areas are towards the margin and base defined by dentate dark lines; these are of a light reddish-yellow 
colour which warms into whitish at the costal margin; at the end of the discal cell a roundish, white 
