1076 
HYSTEROCLADIA. By Walter Hopp. 
mirabilis. 
jcrc- 
cosiaia. 
■primi- 
genia. 
lalhmca. 
rosei- 
collis. 
vi cina. 
tolimensis. 
servilis. 
werneri. 
elongaia. 
lena. 
ignicornis. 
conjuncia. 
eriphua. 
cuousness, it must not be used for determining the species except with caution. The genus is specially charact¬ 
erized by the lateral-basal appendages of the uncus, which are also often serviceable for the diagnose of the 
species, though it is not advisable to regard every difference of shape, of spikes of these appendages, slight differ¬ 
ences in the shape of other male sexual parts as the characters of a species; they are either variable or caused 
by a changed position (which at once yields a very different projection), or they are effected by a preservatory 
treatment with a solution of caustic potash, alcohol and xylol. The determination of Hysterocladia is a task 
that cannot be solved satisfactorily without training and material. 
H. mirabilis Schavs , from Colombia, is easily recognizable by the black costa of the forewing extending 
to the apex, and besides it is the largest species known (length of forewing: 15 mm) and therefore looks like 
an Aithorape. Vertex of head red. Anterior and middle legs blackish. Appendages of the uncus without the 
spikes. 
H. ferecostata Hopp. from Peru, has also a black costa which, however, does not extend to the apex; 
it is a smaller species with narrower, somewhat prolonged forewings (11 mm long), and small roundish hind- 
wings. Vertex of head red, slightly intermixed with white. The uncus-lobes terminate into a long thorn almost 
reaching the sacculi which are slender, ramified; the anellus is deeply sinuate with long lateral tips. 
H. primigenia Hopp, from Peru, is second in size (length of forewing: 13 mm); it has male sexual organs 
similar to those of Proterodadia and is therefore the only Hysterodadici with filiform rudimentary harpes ending 
in a hair-pencil and arising on huge, dark-chitinized hollow bases. The head of the only specimen at hand is 
coloured red between the base of the antenna and the eye. 
H. latiunca Hopp (160 a) is one of the smallest species (length of forewing: 9— 0y 2 mm) and may be 
identical with corallocera Fldr. the specific character of which, however, is no more ascertainable from the figure 
of a $. The red hair-tuft of the thorax may also be absent. The uncus has broadly oviform wings. The sacculi 
twine round the anellus. Widely distributed: Cuba, Guiana, Amazons, Ecuador. 
H. roseicollis Dogn. (160 a), as the name indicates, has a red collar, and besides red thoracal hair covered 
by the white tegulae; the vertex of the head is pink. The same red colour, however, is also found in vidna 
and tolimensis. The uncus has broad wings, narrowed apically; uncus-lobes roundish, the one pair with a long 
spike. Guiana, Upper Amazons. 
H. vicina Hopp, described as a subspecies with transitions, differs in the narrow, prolonged one pair 
of uncus-lobes, and broader sacculi provided with knee-shaped hunches. Peru, Bolivia. 
H. tolimensis Hopp has the same exterior and differs in short, scanty spikes of the appendages of the 
uncus, broad flat sacculi which are broadly turned over on the inside, and the deeply sinuately parted anellus 
with rounded terminal lobes. Colombia (Canon del Tolima). 
H. servilis Hopp is a rather large species (length of forewing: 12 mm) from Peru; the head is partly 
coloured red, the uncus is narrow, not winged, with large appendages, one pair of which terminates into a large 
spike. The sacculi are large, curved, intensely chitinized inside, the anellus deeply sunk. 
H. werneri Hopp, from Colombia, is recognizable by the dense number of spikes on the end of one pair 
of the uncus-lobes; the sacculi are large, with lateral tips. 
H. elongata Hopp is a large species (length of forewing: 13 mm), from Peru, with especially large pro¬ 
longed uncus-lobes, one pair of which is apically set with several small spikes, with a narrow long uncus, large 
sacculi in the shape of broad hooks, the inside of which is intensely chitinized. 
H. lena Sdi aus exhibits the two pairs of uncus-appendages roundish, almost fused, the sacculi narrow, 
pointed, slightly curved. From Costa Rica, Venezuela, Guiana, the Amazons, and Colombia. 
H. ignicornis Sells. is rather small with a winged uncus, the one pair of appendages are knee-shaped 
and irregularly spiked; the shape of the sacculi is somewhat variable, either broader or narrower small hooks, 
Sometimes prolonged apically; middle legs blackened inside. Head white or partly red. This seems to be a charact¬ 
eristic representative of the tropical coasts, known from Panama, the western coast of Colombia, Guiana, and 
the Amazons. 
H. conjuncta Hopp with red hair on the head was separated from it owing to the shortened transtilla- 
branches and the narrow uncus which is not winged. Ecuador and British Guiana. 
H. eriphua Dogn. is the only Hysterodadia with an apparently rudimentary marking or partial colour¬ 
ing on the forewings; brownish strijjes between the veins are widened at the distal margin on the veins and 
fringe. Head white, with single red places around the antennae and on the vertex. Described as Alamella, but 
according to Dyar it belongs to this genus here. The species has remained unknown to me. Panama. 
