FAM. GEOMETRID/E 189 
138. GENUS PACHYCOPSIS, WARREN 
Pachycopsis. Warren, Novit. Zool. Vol. 4, p. 428 (1897). 
Paraplodes. Warren, ibidem, Vol. r1, p. 24 (1904). 
Characters. — Face smooth. Palpus very slender, in cf rather short, but with third joint long 
in proportion, in 9 longer, third joint very elongate. Tongue slender. Antenna in c bipectinate with 
rather long branches, apical part merely serrate; in Q serrate or with short pectinations. Pectus slightly 
hairy. Femora glabrous. Hindtibia in cf with pencil of hairs and short terminal process, in both sexes 
with terminal spurs only, the inner long. Abdomen not crested. Frenulum in cf short and slender, from 
before basal expansion, in Q wanting. Wings rather thinly and smoothly scaled. Forewing with costa 
arched, apex moderate, termen curved, cell less than one-half, SC! from cell, anastomosing strongly 
with or running into C, SC? stalked to beyond SC», M! separate; hindwing rather long, termen rounded, 
often slightly sinuous, tornus pronounced, cell short, C anastomosing with cell for a considerably 
distance, SC? very long-stalked, M! well separate. 
Early stages known. 
On the whole somewhat less hyaline than Hydata, to which it is nearly related; but the chief 
structural difference is the absence of the median spurs in both sexes. 
Type of the genus : Pachycofsis tridentata, Warren (1897). 
Geographical distribution of species. — 'ropical South America. 
1. P. tridentata, Warren. Ecuador to French Guiana. 
Pachycopsis tridentata, Warren, Novit. Zool. Vol. 4, p. 428 (1897). 
Hydata tridentata, Warren, ibidem, Vol. 14, p. 204 (1907). 
2. P. malina (Butler). Amazons to French Guiana, 
Aplodes malina, Butler, Trans. Ent. Soc. Lond. p. 330 (1881). 
Hydata malina, Waxren, Novit. Zool. Vol. 7, p. 134 (1900). 
Hyalorrhoé malina, Warren, ibidem, Vol. 11, p. 21 (1904). 
3. P aurata (Warren). Ecuador. 
Paraplodes aurata, Warren, Novit. Zool. Vol. 11, p. 25 (1904). 
4. P. lunifera (Warren). Peru. 
Hydata lunifera, Warren, Novit. Zool. Vol. 14, p. 204 (1907). 
NortE. — Felder's caducata, which we have placed provisionally in Hydata, may have to be trans- 
ferred here. We have seen two Q Q of a Pachycopsis from the island of Taboga which may be referable 
to it, but have had no opportunity of comparing them with Felder's type. The figure, like so many of 
Felder's among the Geometridae, 1s unrecognizable. 
i139. GENUs CHLOROCOMA, TURNER 
Chlorocoma. Turner, Proc. Linn. Soc. N. S. Wales, Vol. 35, p. 581 (1910). 
Chlorochroma. Guenée, Spec. Gén. Lép. Vol. 9, p. 365 (1858) (nec Duponchel, 1845). 
Characters. — Face smooth. Palpus short, but not very slender, second joint short or moderately 
scaled, third joint in both sexes quite small. Tongue well developed. Antenna moderate, in cj bipectinate 
with moderate branches, apically merely somewhat dentate, ciliated; in Q minutely ciliated. Pectus 
somewhat hairy. Femora glabrous. Hindtibia in cf dilated with hair-pencil (except in did;//a), in both 
sexes with all spurs. Abdomen not crested. Frenulum in gf short, moderate to weak, from before well- 
marked basal expansion; in Q wanting. Forewing with costa scarcely arched, apex pronounced or acute, 
