EAM. GEOMETRIDZE 3 
developed; and even in those with c frenulum persisting it scarcely ever appears except in conjunction 
with the migration of SC? to beyond SC? (the only exception being Comibaena, in which both SC! and 
SC? are in a state of flux); unfortunately, on the other hand, the exact position of SC! is variable even in 
many quite specialized genera, sometimes in close allies, occasionally in individuals of a single species. 
Similar remarks apply to the other stalkings, and although a survey of a large amount of material 
has shown them often to supply reliable generic characters, their use requires great caution and could not 
furnish higher groupings. The migration of SC? of forewing to beyond SC? is fixed in the RAomborista- 
group, the Hydaía-group and some others, and therefore very useful; but it is unreliable in a few genera. 
So, also, with certain peculiar conformations of the discocellulars, to be noticed in their places. Vein C 
of hindwing, on which Hulst bases his generic synopsis (Trans. Amer. Ent. Soc. Vol. 23, p. 312) 
follows, apparently rather unmethodically, vet not without yielding occasional useful clues, almost every 
course which is to be found anywhere among the Geometridae; its strong anastomosis with the cell 
(à la Larentiid) is certainly as a rule generic, and we have considered it to be almost always worth using 
as such in the present state of our knowledge; but it is possible that it mav ultimately break down over 
the closely allied genera Hydata and. ProAydata or even over the African Syndromodes or Collesis and one 
or two of their allies We have only allowed latitude in the single case of Hierochthonia, and there only 
as a temporary expedient to avoid the erection of a genus on a species of which only the 9 is yet known. 
Strange sports in venation are of occasional occurrence, and their possibility must be reckoned 
with in using a venational « key » or in defining a new genus on a single specimen (compare Warren 
on ANeurotoca, Novit. Zool. Vol. 4, p. 43). Generally, however, they are asymmetrical, and thus not 
liable to deceive. As a small contribution to teratology in venation, we here put on record the cases 
which have come under our notice in the course of our researches; the Comibaena-Euchloris-group 
seems rather liable to furnish them. Each record refers to a single specimen r). 
Anisozyga gavissima, Walker. Left forewing with C forked. 
Chyrysochloroma mecki, Warren (type specimen). Ditto. 
Racheospila erina, Dognin. Right hindwing with R? stalked with R!. 
Comibaena pustulata, Hufnagel. Right hindwing with small connecting bar between SC? and R! not far 
from their origin; left hindwing with rather long oblique additional vein from cell running 
into C. 
Comibaena delineata, Warren. Both forewings with R? well stalked with SC?-R! (SC! connate with that 
stalk), but on left wing R? separates from R! opposite departure of SC?5, while on right wing 
itis stalked with R! to considerably beyond that separation; further, in both forewings, R' is 
furcate well before termen. 
Microloxia herbaria, Hübner, var. (?) advolata, Eversmann. Left hindwing with cell narrowing distally, 
by deflexion of SC (which therefore becomes excessively remote from C); SC?, R! and R? connate 
from apex of cell. 
Microloxia indecretata, Walker. Left forewing with SC? long-stalked with R!, quite apart from SC?*, as 
in the Efiblemidae. 
Euchloris albocostaríia, Bremer. Both forewings ditto. 
Euchloris Plusiaria, Boisduval. Left forewing with C throwing out a spur costad opposite the disco- 
cellulars ; right forewing with SC! forked (two specimens, same time and place). 
Euchloris chlorophyllaria, Hedemann. Left forewing with R? stalked with R!. 
Euchloris quantula, Swinhoe, ab. elareosa, Swinhoe. Left forewing with SC* arising from SC? instead of 
from SC?, 
1) See also Meyrick, Proc. Línn. Soc. IN. S. Ialdes (2), Vol. 2, p. 908, on a. « Z7ygocAroma » percoméftarta, Guenée, and iníra, p. 38, footnote. 
