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MESOSCIA. By Walter Hopp. 
11. Genus: Mesoscia Hbn. 
The genus Mesoscia Hbn. (Saltiga Wkr., Archylus Wkr .. Ramaca Dyar) is characterized by the append¬ 
ages of the male 10th ventral segment being represented by an unpaired uncus and lateral paired socii or by 
the socii being laterally fused with the uncus. From this organization differ: Malmella in which the uncus pro¬ 
jects as a dorsal comb beyond the ventrally fused socii, Macara and Trosia the fused socii of which are likewise 
situate ventrally to the uncus, and Norape in the species of which the uncus is absent or only rudimentary. In 
contrast with the compared genera, Mesoscia observes a more original stage in this respect. Correspondingly 
also most of its species exhibit yet colourings and markings which Malmella, Macara, and Norape have lost 
or which are only rudimentary in them. But also single Mesoscia show already the loss of pigment. Most of the 
Mesoscia exhibit the median branches 2 and 3 (veins 4 and 5) on a long stalk, but this mark varies individually 
and occurs also in single specimens of other genera. The species are not only discernible by the male sexual 
armature, but mostly also by their colourings and markings. 
pusilla. M. pusilla Stoll ( = latifera Wkr.) (160 b). The brown distal margin of the forewing is pierced here by 
white veins. Collar pink or white. Hindwing with a more or less large white central spot. Guiana, Panama, 
Colombia, Amazons to Peru. 
dumilla. M. dumilla Dyar (160 b) is the Mexican representative of this species, the brown distal-marginal zone 
of the forewing is smaller, the brown median band at the inner margin still broader, the collar invariably white, 
hindwing almost white. The male sexual armatures of both the species are distinctly separated; pusilla is 
especially characterized by a longer casing of the penis-mantle and a broad-shelled anellus. 
dijari. M. dyari Schs. is distinguishable by the strongly reduced white postmedian band of the forewing. 
Costa Rica. 
pascora. M. pascora Schaus (160 b). Here all the brown of the forewing and hindwing is more grey and besides 
interrupted by white veins. South Brazil. 
procera. M. procera Hopp (160 b) with a pink or white collar shows the brown distal margin of the forewing 
and hindwing broken up into wedge-shaped brown stripes between the veins; this species lias very long sacculi 
which are bare like the harpes, but hairy in pusilla. From the Amazons. 
criophora. M. eriophora Sepp (= antonina Dogn.) (160 b) is very similar to procera in the wegde-shaped brown 
stripes at the distal margins of the wings, but it is larger, and the brown median band of the forewing is hardly 
widened at the inner margin; it lacks the white belt at the base of the thoracic dorsum. Guiana, Panama, West 
Colombia. 
angui- M. anguilitiea Schs. (= inflexa Hopp) (160 b). The white postmedian band of the forewing is almost 
tinea, rectangularly incurved, it ends pointedly near the subcostal vein. The sizes of the A<S differ here from 15 to 
23 mm, and besides there occur specimens with entirely white hindwings. Guiana, Amazons, South Colombia 
(Mocoa). 
terminata. M. terminata Schs. (= fluxa Schs., meroma Drc.) (160 b). This species as well as 
loma. M. lorna Schs. (160 h) are so characteristically coloured and marked that we may refer to the figures. 
Both the species are widely distributed, lorna from Mexico downwards, terminata from Costa Rica downwards, 
in Guiana, Venezuela, Colombia, Ecuador, on the Amazons from Para to Peru, but they are absent in South 
Brazil. 
itatiayae. M. itatiayae Hopp is all white with a narrow black costa of the forewing, and black tibiae and tarsi. 
In the structure of the male 10th ventral segment it is relatively near M. lorna, but very different from the 
externally rather similar N. beggoides Dyar with which it occurs on the Itatiaya. On an average, itatiayae is 
the smaller species with somewhat narrower forewings. Fresh specimens show that itatiayae has a dorsal light 
yellow hair-tuft as the base of the abdomen, while in beggoides the whole abdomen is suffused with yellowish. 
If the curved sacculi project from the abdominal end, the species are discernible by the sacculi being gradually 
pointed in itatiayae, distinctly defined in beggoides. 
guttifascia. M. guttifascia Wkr. (160 b) (described as an Archylus) is a white species with black feet, the forewing 
marked with black streaks and dots. Amazons, Guiana, Colombia. 
unifascia. M. unifascia Dogn. (160 b) differs from guttifascia in the smaller number and size of the black spots and 
especially in the shorter socii of the males. Known from Costa Rica and Panama; described and figured as 
guttifascia in the Biologia Centrali-Americana. 
