HYDATA. By L. B. Prout. 
67 
P. vitrearia Schaus. “22 nun. Forewing olivaceous; the median space between subcostal and sub- vitrearia. 
median veins semitransparent, pale green; a green discal spot; a small apical pale green spot. Hindwing oliv¬ 
aceous, a basal transverse semitransparent line pale green; a dark outer transverse line; the outer margin and 
fringe paler green." Aroa, Venezuela. This is a $ form and I suspect may refer to the $ of povera. 
P. subpartita Dogn. Near propinqua (8 h), the forewing rather broader, the hindwing less produced subpartita. 
at the 1st radial; forewing with more green at the apex, hindwing with the grey band narrowing towards ab¬ 
dominal margin (in propinqua widening). The costal vein of the hindwing anastomoses at rather more than 
a point, but not so markedly as is usual in propinqua. Medina, E. Colombia. 
P. propinqua Prout (8 h). Closely resembles a larger Hydata translucidaria (8 i) and forms a troublesome propinqua. 
transition between the two genera; the costal vein of the hindwing runs close to the cell for a considerable 
distance and although the actual anastomosis is sometimes confined to a point rather far from the base yet 
at other times this anastomosis becomes more extended. Apical patch of forewing rather large; green border 
of hindwing typically narrow. E. Peru. 
P. apicata Schaus (8 h). After examining (somewhat hastily, in the United States National Museum) apicata. 
the type of this species, I fear that my propinqua must sink; having described the latter as a Hydata, I over¬ 
looked the possibility. The specimen which we figure, from Santo Domingo, Carabaya, was determined by 
Warren as apicata, agrees accurately with the description and seems at most a small local form of the preceding 
species. Various allied, but not identical, forms from Central America, Colombia, Venezuela, British Guiana 
and the Amazons have also been determined as apicata. 
P. exsignata Dogn., founded on a rather large $ (25 mm from tip to tip) from Pacho, Colombia, is com- exsignata. 
pared with latifasciata (8 g) but has the hindwing more acuminate at the 1st radial, the forewing with a distinct 
opaque cell-spot, the broad dark olive-grey border cut with reddish along viens 1, 2 and (more slightly) 3, 4 
and 5 and with a proximal sinus between veins 5 and 6. Perhaps nearer to vitrearia, but with the pale median 
area of the fore wing very much wider at costa than at its posterior end. 
35. Genus: Hyclata Walk. 
Distinguished from Prohydata, as noticed above, by the strong, Larentiid-like anastomosis of the 
costal vein of the hindwing; 2nd subcostal and 1st radial as a rule longer stalked, sometimes neaily to the apex. 
H. translucidaria H.-Sch. (= sordida$c/wras) (3 5 k, $ 8h). Quite distinct from all other Hydata, phylogenetic- transluci- 
ally in the direct line of descent from the Prohydata apicata group. Herrich-Schaeffer figured a $ as “3” and 
Schaus — then unaware of the sexual dimorphism of the group — described the true 3 as sordida. S. E. Brazil. 
H. satisfacta Walk. (= spilosata Warr.) (8 h) somewhat resembles lightly-marked S3 of translucidaria satisfada. 
on the forewing; hindwing hardly angled at the 1st radial, predominantly pale yellow-green (as the forewing), 
but with prominent dark spot at abdominal margin. $ similar to Si but with palpus extremely long, antenna 
not pectinate. Brazil (loc. typ.) and Argentina. 
H. felderi Schaus (8 i). Markings rather extensive, but shadowy; hindwing less heavily darkened than felderi. 
in translucidaria and the similar Prohydata species and rather better rounded, the angle at the 1st radial very 
weak. $ with subterminal band of forewing more developed posteriorly. Mexico. 
H. diaphana Warr. (8 i). A striking little species, very heavily marked, all the remnants of the white- diaphana. 
green ground-colour small, except in the apical region of the forewing. S. E. Peru: Santo Domingo. 
H. radiata Warr. (8 i). Larger than subfenestraria, the forewing with narrower subterminal band and radiata. 
less broadly interrupted pale band beyond it. E. Peru: Cushi, Huanuco. 
H. subfenestraria Walk. (8 i). Easily known by the broad bisection of the pale median area. Variable subfene- 
in size. Described from Venezuela, but extending to Panama, Peru and Brazil. strana 
H. oxytona sp. n. (6i). Closely like the largest Carabaya forms which we refer to subfenestraria (8 i), but oxytona. 
still larger (29 mm), $ palpus a little less long, antennal lamellae perhaps deeper, forewing with termen more 
sinuous, hindwing with a much sharper tooth at the 1st radial and a definite concavity between this and the 
3rd; the grey parts more violet-tinged, the hyaline subbasal band and pale postmedian line of the hindwing a 
litte widened. Agualani, Carabaya, S. E. Peru, 9000 feet (G. Ockenden), type in Mus. Brit, ex coll. Ober- 
thur. Perhaps a high-altitude form of the preceding, as some from 6000 and 7000 feet seem slightly inter¬ 
mediate, yet the venation suggests a Prohydata. 
H. notula Dogn. “18 mm. Very pale olivaceous, opaque, the forewing with the following semihyaline notula. 
spots: a broad submedian commencing at the first third of the wing, embracing the first half of vein 2 and 
