126 
ATYRIA. By L. B. Prout. 
matutina. 
cruciata. 
matutineUa. 
mayonensis. 
pernigrata. 
intermedia. 
nanipennis. 
pernigrata. 
vespertina. 
osera. 
hypocyanea. 
species; if, as is indicated, the 3rd joint of the palpus is elongate, Cyllopoda would be the probable genus, 
but the aspect is in some ways rather that of sciaulax; anterior yellow streak of hindwing notably broader 
than posterior. We reproduce the type figure. 
A. matutina Walk. Wings relatively shorter than the average, the distal part of the forewing well 
rounded. Typically very similar above to volumnia q , hindwing beneath with costa black to the base, sub¬ 
median yellow streak above and beneath long, nearly always reaching the base, beneath suffused with vinace- 
ous; outer patch of forewing invaded proximally by a blackish streak at 1st median vein, which, however, is 
often short, at times wanting. The type, a $ from Nauta (misprinted Nanta), Rio Ucayali, is the only specimen 
known from the locality and seems intermediate between the two best-known races, so that the nomenclature 
cannot be regarded as final. It has unfortunately lost the tegulae and has the submedian streak of the hindwing 
narrowed but the rest of the yellow parts well developed. A single $ from Hyutamaliam, Rio Purus (K. J. 
Hayward), is also difficult to place. — cruciata Warr. (17 i), founded on a large (40 mm) from ‘"Bolivia - ’, 
without adequate locality, seems to be the oldest name for the race from La Paz (department) and E. Peru, 
at least to Huanuco. Not extremely variable, the yellow parts well developed and including almost always 
a spot on the tegula, the submedian streak of the hindwing scarcely ever reduced to a mere line. The type 
by no means the commonest form, has the black streak of the hindwing forked distally on the medians; our 
figure, except in size, agrees accurately, although, by any obvious lapse, Warren places the streak and its 
fork on veins “2" and “l -- (!). — ab. matutineUa Strand (= matutina Strand , nec Walk.) is the commoner form, 
without the furcation of the longitudinal band, the hindwing above therefore almost exactly like that of volum¬ 
nia. The type <$ was from Mapiri. A $ from Hyutamaliam, Rio Purus (K. J. Hayward) adds to its range. 
Aberrations with this band tapering distally may conceivably (though not probably) be the true malanciata; 
see above. — mayonensis subsp. nov. (17 k). A good series from the Oberthur collection, from Loreto (Moyo- 
bamba, Tarapoto, Yurimaguas, etc.), shows a very interesting race. The increase of black colouring in the 
AA brings about a quite remarkable parallelism to nanipennis , from which they are often scarcely distingui¬ 
shable except in shape and in the genitalia. Tegula without a yellow spot; submedian streak of hindwing above 
and beneath linear, the black streak consequently broadened. As type I have chosen a <$ from Tarapoto, which 
does not diverge excessively from the preceding races, the submedian streak (line) reaching the base, though 
only very slenderly, the anterior curved patch little reduced. — ab. pernigrata nov. is the other extreme, the 
hindwing appearing unicolorous black, though the lens reveals a few yellow scales about the radial fold; fore¬ 
wing with 1st median blackened throughout. — In order to avoid multiplication of names, I call the series of 
transitions ab. intermedia ab. nov. Beginning with those in which the submedian streak of the hindwing is 
wanting and the anterior one merely a short dash, they show a gradual increase of the latter and then a re¬ 
appearance of the former, at first very short or incomplete. — The of mayonensis differ less from those of 
cruciata. 
A. nanipennis Warr. (17 k). The <$<$ are distinct from those of matutina in the reduction of the hind¬ 
wing while the forewing remains proportionally elongate apically. Otherwise extremely similar to m. mayo¬ 
nensis. Its black is scarcely so intense, the posterior half of the A abdomen beneath shows a tendency to be¬ 
come paler, the long hair on the upper side of the hindwing posteriorly is more copious. The genitalia have 
differently shaped valve and saccus from matutina. $ hard to distinguish, the black border of the hindwing 
generally broader. Ecuador: Sarayacu (common); also (?) Rio Cachiaco (affluent of Rio Huallaga), one only. The 
name-type corresponds approximately to ab. intermedia of matutina and has the darkening of the 1st median 
of the forewing complete. — ab. pernigrata nov. has the hindwing almost entirely black. 
A. vespertina is nearly always distinguishable, at least in the by the point of origin of the 5th sub¬ 
costal of the forewing, which, though variable, arises from the areole instead of from its apex or the stalk of 
the 2nd—4th; very commonly its base is actually much nearer to the 1st radial, at times connate or even 
stalked. The and to some extent the are known by the large blackish proximal area of the hindwing 
beneath. Outer patch of forewing considerably narrower than in the 4 preceding species, more as in dichroides. 
Otherwise strongly variable or embracing more than one structurally indistinguishable species. Costal margin 
of hindwing narrowly yellow, even in the most blackened forms. Most are found in the same areas, in and 
near Cundinamarca. — vespertina Walk. (17 k). Rather deep orange, the black on the upperside of the hind¬ 
wing extended, and with streaks connecting it with the black distal border. Bogota (type) and the Upper 
Amazons. — ab. osera Bsd. was said to come from Honduras and Mexico, but this is highly improbable. A 
specimen from Boisduval's collection (labelled “Mexico”) shows the form without connecting rays between 
cell and border of hindwing and this is borne out by his description. Known from Bogota. — ab. hypocyanea 
Warr. (17 k), also from Bogota (type), and from Cananche, Cundinamarca, is a yellow (not orange) develop¬ 
ment of osera , with the black of the hindwing a little further reduced. A slight modification, with a slender 
black extension along the 1st median as far as the black border, recalls on the hindwing the matutina group. 
