68 
METHYDATA; PACHYCOPSIS. By L. B. Prout. 
terminating on the base of vein 3 and below the submedian fold; a small postdiscal spot from vein 5 to 7; a 
very small subapical.” Rio Songo, Bolivia, 2 Shape of wings as in alada. 
alada. H. alada Dogn. “22 mm. Form of busa Bruce. Almost exactly recalls subfenestraria (8 i), but this 
latter species has the hindwing rounded. Forewing with base, a broad costal spot at the end of the cell and 
the last third of the wing opaque, pale greenish yellow, the rest of the centre, a small subapical dot and a small 
dot at the inner angle vitreous. Hindwing opaque, of a warmer yellowish.” Loja, 1 §. 
mctaloba. H. nietaloba sp. n. (8 i). I have not been able to find any existing description of this small Hydata, 
which recalles Pacliycopsis malina but has all the spurs of the hindtibia developed. It is characterized by the 
shape of the hindwing, which is noticeably lobed at the 3rd radial to 1st median, at least as prominent at the 
latter vein as at the former, generally, indeed, more so, so that the concavity reaches from the 1st radial to 
the 1st median. Markings shadowy, not (as in scripturata) blackish; cell-spot of forewing large, bands placed 
nearly as in P. malina. the subterminal, at least on the forewing, rather strongly interrupted, but forming a 
well-developed costal spot. Hindwing with 2nd subcostal extremely long-stalked, as in Pacliycopsis. S. E. Peru: 
La Oroya, Tinguri, etc., the type $ from La Oroya in Mus. Tring. Also known to me from Colombia. 
scripturata. H. scripturata Warr. (8i) approaches nietaloba in the shape and venation of the hindwing, but has a 
very distinctive pattern of zigzag blackish lines, in part interrupted, in part confluent. S. E. Peru. Also one 
example known from Upper Rio Negro, E. Colombia, possibly differing racially. 
clegans. H. elegans Bastelb. (5 i). Markings slight, excepting the bent subbasal band of the forewing and ill- 
defined subterminal band of both wings; forewing (as in satisfacta ) also somewhat darkened at costa, a weak 
dark costal postmedian spot noticeable. E. Peru: Huancabamba, only the type known. 
36. Genus: Methydata gen. nov. 
A development of Prohydata Schaus, very distinct in that the palpus is quite short, even in the $, and 
the hindtibia in both sexes has terminal spurs only. Antenna in $ pectinate. Hindwing with termen weakly 
sinuous, the costal vein anastomosing at only a point with the subcostal. Type of the genus: auster Prout 
(described as Prohydata). The palpus and venation preclude placing this species in Pachycopsis. 
auster. M. auster Prout (8 i). Recognizable by the structure. Moreover it is the only species yet known from 
S. E. Brazil with this type of maculation, which somewhat recalls that of P. stigmatica. The $ is similar to 
the figured <$, but a little more weakly marked. 
37. Genus: Pacliycopsis Warr. 
Derived from Hydata by the loss of the proximal spurs of the hindtibia; the $ retains the long slender 
process which might, on casual inspection, be mistaken for a third spur. Palpus in the $ with 3rd joint elongate. 
Antenna in the $, so far as yet known, deeply lamellate. Hindwing with distal margin sinuous, but without 
distinct angles, costal vein anastomosing with subcostal to beyond middle of cell. 2nd subcostal extremely long- 
stalked with 1st radial. Only a few species, all Neotropical. 
aurata. 1 P. aurata Warr. is as good as unknown, as the type $ is in very bad condition and probably discoloured. 
Warren proposed for it a genus Paraplodes , but its structure shows it to be an absolutely typical Pacliycopsis. 
“16 mm. Yellowish green, without any markings. Fillet and base of antenna snow-white.” Pambilar, Ecuador. 
A careful examination shows remnants of greener patches which would indicate the opaque markings of the 
allies and suggest that it might be a small malina. 
P. malina Butl. (8i) is very difficult to obtain in good condition, but can, as a rule, be easilydistin- 
guished from tridentata by its more variegated appearance, the forewing with large cell-spot, the hindwing with 
strong spot at middle of abdominal margin, the dentate white lines less slender and more mixed with yellow. 
Butler’s type was from the Amazons, but the species has since been found in Colombia, Ecuador and French 
Guiana. tabogana subsp. nov. is larger (20 mm), paler, the hyaline areas extended, the subterminal green 
band more macular, the dark cell-spot of the forewing remaining large and conspicuous. Taboga I., Panama, 
type $ in coll. Brit. Mus. Perhaps a separate species, intermediate towards caducata. 
caducata. P. caducata Feld. (5 i). The $ is unknown to me and until recently I had only seen Felder’s broken 
type from French Guiana and referred the species conjecturally to Hydata. 4 good from Taperinha, near 
Santarem (Dr. Zerny) are smaller but otherwise agree absolutely and show that it is a Pacliycopsis, distin¬ 
guishable from malina by the small cell-spot and darker, more opaque markings, the subterminal band of the 
hindwing greatly broadened. 
malina. 
tabogana. 
