178 
HYDRELIA. By L. B. Prout. 
undularia. 
leucogram- 
ma. 
impleta. 
adesma. 
tchraichra- 
ria. 
castaria. 
flammeola- 
ria. 
confluens. 
ochrearia. 
bicolorata. 
ferruginaria. 
aggerata. 
luteospar- 
sata. 
H. undularia Leech (16 g). We give a figure of the type <J. To the notice given in Vol. 4 (p. 268) I 
add: Face prominent, dark; $ antennal ciliation fully as long as diameter of shaft. From the preceding it 
differs in the characters just given, the somewhat more elongate wings, darker colouring and less punctiform 
maculation. Sterneck adds Chengtufu as a locality. 
H. leucogramma Wehrli (? = musculata Sterneck , nec Stcjr.) (14 d). Smaller than undularia (26 mm), 
dark brown with white maculation, lacking the black streak on the 3 radials and the brown band between 
the postmedians, etc.; certainly not the true musculata (Vol. 4, p. 268), which is smaller, the wings much more 
acute, the colour and the arrangement of the bands quite different. Fringe very striking, brown on proximal 
half, snow-white distally. Underside of forewing dark brown, with 2 black costal spots (at % and towards 
the apex), cell-dot not sharp, a faint dark submarginal line, termen with black triangles, but without the 
short white streaks which interrupt them above. 2 from Ta-tsien-lu, besides another from the eastern boun¬ 
dary of Tibet. 
H. impleta sp. n. (16 g). On the whole less small than the following (20—24 mm); less round-winged; 
slightly less brownish grey; markings darker, variable in strength, but always more or less heavy, the lines mar¬ 
ked with larger black dots on the veins, particularly so the postmedian; typically there is a good deal of 
dark clouding about the postmedian group of lines of the forewing and oftener than not there is a consoli¬ 
dated patch about the (pronounced) central projection. Hindwing well marked. Pehlinting. 50 miles N.N.W. 
of Chengtu, 6000 feet (G. M. Franck), type series in my collection. 
H. adesma Prout (16 g). Closely like nisaria , with which it has generally been mixed (perhaps even 
by Christoph himself, so that an examination of his type may be necessary). Slightly rounder-winged and 
markedly more suffused, with the cell-marks weakened. Antennal ciliation of the less minute, distally rea¬ 
ching about V 2 diameter of shaft. Very readily distinguished in both sexes by having the 3rd radial and 1st 
median of the hindwing well separate at their origin (as in most Hydrelia), whereas in nisaria they are well stalked. 
Japan and Corea; probably also in Szechuan. 
H. tchratchraria Oberth. (Vol. 4, pi. 13 g, as tschrachiaria) . This strikingly distinct species proves to 
be a Hydrelia and not, as provisionally placed in Vol. 4 (p. 272), an Astlnena. It occurs also on Omei-shan 
and there is a race, or very closely allied species in Upper Burma, opedogramma Prout , which will be dealt 
with in Vol. 12. 
H. castaria Leech (Vol. 4, pi. 7 k, as costaria). Another somewhat abnormal-looking Hydrelia, but 
obviously better placed here than in Cidaria (Epirrhoe ) to which I erroneoulsy referred it in Vol. 4 (p. 255). 
The pattern somewhat recalls that of Asthena defectata (pi. 16 i). The relation of the 1st to the 5th subcostal 
is here somewhat unstable. 
H. flammeolaria Hufn. (= ? sinuosata Giorna) (Vol. 4, pi. 10 h, as luteata). E. Lange (Iris, Vol. 34, 
p. 226) has given a good life-history of this species and exploded the fable of the feeding of the larva on 
sallow catkins. — ab. confluens F . Hoffm. has the two central brown stripes confluent behind the cell-dot. 
Founded on a <J from Krieglach. 
H. ochrearia Leech (Vol. 4, pi. 13 e). The hindwing is perhaps sufficiently bent to make this a 
good transition between the more simply-shaped species and the angle-winged; but its taxonomy has not 
yet been particularly studied and in any case I have not found any great value in the shape-distinctions 
in the present genus. Antennal ciliation in the A minute. 
H. bicolorata Moore (16 g). A antenna almost simple. I give a figure, but still know no Palaearctic 
forms beyond those of such border-line localities as Dharmsala and Dalhousie. — ab. ( ?) ferruginaria Moore. The 
blackish thorax, as well as the blackish parts noted in Vol. 4 (p. 269), gives this a distinctive appearance and 
I fully expect that it will eventually be found to be a separate species. I have not yet seen it from Palaearctic 
India. 
H. aggerata sp. n. (16 g). Very similar to ferrugmaria, particularly in the black upperside of the 
thorax and base of abdomen. Ground-colour less mixed with red; the dark part (i. e., the anterior half) 
of the median band much broadened, the faint grey subterminal band not angled outward in the middle. 
Omei-shan, 7000 feet, 17 July 1931 (G. M. Franck), 4 fyP e in mv collection. 
H. luteosparsata Sterneck. Palpus minute. Antenna simple. Expanse of set specimen “22 111111 “ (i. e. 
an actual measurement of about 26 111111 ). Both wings with termen bent at 3rd radial. Reddish grey, with 
light yellow, slightly reddish-edged markings. Forewing with antemedian consisting merely of 2 large yellow 
spots, postmedian also macular, irregular in size, interrupted at the costa and in the middle; 2 interrupted 
subterminal lines. Hindwing with the end of the dark area (the true postmedian) close beyond the cell-dot, 
a broad yellow postmedian band outside it, also 2 narrow subterminal lines. Ta-tsien-lu, 2 J'J'. Probably near 
arizana Wileman (Formosa), though that has strongly dark-dotted veins. 
