costalifi. 
can drier. 
arej yridiu. 
sjbstedii. 
nunnosel- 
sfa. 
mcruana. 
inntili:^. 
unipeefen. 
tain.vi. 
116 HYDRELIA; ASTHENOTRICHA. By L. B. Rrout. 
31. Genus: Hydrelia Hhn. 
A widely distributed gemis, characteristic chiefly of tem])erate regions, its geiioty])e the Palaearctic 
fesfaceafa Don., see Vol. 4, p. 267 (further information will he given in Vol. 12). The smooth face (rare in the 
Larentiinae excepting the present group and that of Sauris, with its long palpi), the simple areole of the fore¬ 
wing and simple discocellulars of the hindwing are generally sufficient characters for its discrimination. It is 
possibly connected by Eois (p. S3) with the Sterrhinae, but that genus has the areole much reduced or wanting, 
the 1st subcostal of the forewing arising beyond the 5th, the 1st median of the hindwing stalked and the an¬ 
tenna, at least in the generally strongly bipectinate, while Hydrelia has as a rule much more nearly the 
structure of Asthena Hhn. (Vol. 4, p. 271), through which it is connected with the more typical Larentiinae. 
Idle African representatives of Hydrelia belong chiefly to the mountains and incline to form transitions to the 
genus (or section) AsthenotricJia ; see below. 
H. costalis Auriv. ( 12 e). A glossy white, grey-marked species, beneath Avith the grey colour becoming 
])redominant, with a narrow', shar])ly defined white hand just outside the cell. Kilimandjaro, 2700 m and 
up w'ard. 
H. candace Prt. (12e) is near the common argyridia (12e), especially to its even the freshest 
being considerably less dark than argyridia Forewdng with less pronounced lobe or prong in the middle of 
the postmedian white hand and with better developed sidAterminal; hindwdng with median band broadened, 
the AA'hite postmedian bands narrow, two macular subterminals indicated. Abyssinia; Adis Abeba. 
H. argyridia Butl. (== disparata Warr.) (12e). Described from Mt. Kenya, perhaps its best-known 
locality, but distributed in the highlands of Kenya Colony, Uganda and the Ruanda district. Moderately 
variable. For the differentiation of its nearest allies, see candace and sjosteclti. 
H, sjdstedti Auriv. (12 e) has the dark parts more deeply coloured than in argyridia, the outer prong 
of the median band much more produced, the wdiite hindwing Amry feebly marked, A\'ith the exception of the 
narroAV but sharply defined dark border. Kiliniandiaro, at the same altitudes as costalis; also recorded from 
the district of the Great Craters. — mionoseista Front, from the Kivu district of Belgian Congo, is slightly less 
blackish, AAuth stronger slaty gloss, the median band and the AA'hite one beyond it not quite so strongly produced, 
hindAving AA'ith the fringes paler, their proximal half chequered Avith grey opposite the veins. I belieA'e the 
same race occurs in AA'estern Uganda. 
H. memana Auriv. only differs from sjdstedti in that the median line of the hindA\dng is entirely 
Avanting and that the median band of the foroAving disappears behind the 1st median vein, AA'hile the OAitAA'ard 
prong is perhaps eA'en longer than in sjdstedti; possibly a further race of the same species. Mount Meru, the 
typical series collected at an altitude of 3000—-3500 m. 
H. inutilis Prt. (12 e). In coloration and pattern, in the strongly arched costal margin of the hind- 
AA'ing and according to Janse in the genitalia a very definite relative of AsthenotricJia , but lacking the o 
hair-tuft on AA'hich that genus ( ? subgenus) AA-as founded. SomeAAdiat Amriable. C^ganda (type locality), Kenj'a 
Colony, Tanganyika, TransA^aal, Xatal and Ca])e Colony, the southern forms and one from RuAA'enzori j)erhaps 
on the Avhole larger, etc., so that at one time I intended to give them a separate name, but I think East Africa 
SAipplies transitions. 
H. unipecten Prt. (12e) seems evidently related to inutilis, but is curiously distinct in that the (J 
antenna bears A'ery long, slender, curved, uniseriate pectinations, AA'hereas those of all the preceding species 
and of AsthenotricJia are merely lamellate, almost simple. Founded on a long series of from Mt. Aberdare, 
besides some from Mt. Kenya; knoAAm also, in both sexes, from some localities in eastern Belgian Congo. The 
$$ are on an average larger than the 3'3‘, but both sexes areAmriable. •—^tamsi subsp. nov. (12 f) is moreAA'eakly 
marked above and beneath, the cell-dots of the upperside, especially in the minute or eveti Avanting, the 
conspicaious, once-bent line which in unipecten folloAVS the cell-dot of the foreAA'ing faint and AA'aA^y, the pale 
band AA'hich folloAAS the postmedian of the liindAAing clearer, this AA'ing beneath predominantly pale, AA'ith the 
subterminal shades quite faint. Sao Thome (W. H. T. Tams), 3 and 5 $2, collected for the British Museum. 
32. Genus : Astlieiiotrielia M^arr. 
As already indicated, this only differs definitely from some Hydrelia (Avith the costa of the liindAA'ing 
arched) in having a tuft or bimsh of hair on the upperside of the costal part of the G hindAving close to the 
base, extending obliquely outAA'ard; the anastomosis of the costal AA’ith the subcostal is rather shorter than in 
