FAM. GEOMETRIDZE 9 
KEY TO THE GENERA 
A. — Old World Genera 
The.following preliminary key, though rather cumbrous in one or two places, is adapted to 
coincide as nearly as convenient with our six Groups, and so to allow of their being worked out in 
dichotomous tabulation subsequently. It is believed that this will in the net result be found an advantage, 
as the least sharply differentiated groups (Groups I1 and IV) can generally, with a very little experience, 
be quite readily separated by their facies, and the detailed keys resorted to immediately. 
I. Forewing with SC? arising separately from the cell . GmovP I. 
-Foreine «th. S C 2enobarisuesseparately from the.cell. c e o s TT 2 
2. Hinduung without basal expansion 1), frenulum present in both sexes de ar 
Hiindwing with marked basal expansion, Q frenulum absent ov absolutely vestigial 40.0: 
E SISOLETUDITETUULI VI On zT NN. Ls s RR RE ce E c To ou vom ws IGROURS ILIO 
JSCPQDWRRSCADYL SAID. c 15 SU E RS RE NR n 4- 
4. Hindtibia without median spurs 2) . Ac eno as 
H indtibia sth median sfurs.. . . . . . : $6) uvas uuo S RISE CORO 
5. Abdomen very usually crested 3), build usually robust, Mtilong and UE dense; hindwing 
without tail or salient angle at. R9, SC? scarcely ever stalked ; brevailing coloration greys 
or moss greens, never leaf-gyeen ..— ..—. E n SX IL EE GROUPA 
Abdomen not crested, or, if so, hindwing angled or tailed at. R35 build seldom very vobust, 
scaling often smooth; hindwing with SC? oflen stalked; prevailing coloration. bright 
or light greens, usually assimilated do leaves... . 2. . . . . . . Gmoup IV. 
(s SILET FM e Lice S RE DECRE ROUPSVE 
OU enum ase JE EECROUPAVIIF 
It may be added that in Groups V and VI the abdomen is rarely crested, the build usually 
slender, median spurs often wanting, scaling usually smooth, termen of hindwing usually smooth or 
with a single angle or tail, SC! of forewing is at times stalked, C of hindwing often anastomoses with 
cell at a point, sometimes strongly. 
Group I 
I. Thorax and abdomen mot cvested. 2. . 2. . . I. Genus Pnororuvra, Turner. 
PAD gdorenvatau0 d WT LORWET RESI ao rm 2 
2. T'hovax strongly. cvested ; cy antenna bipestinale -.— . 2 2 o. 0. 0. . 9 4 "d ROCHE PEST 
Tioraz not or only sghtLy crested.z cy antenna simple 3. 2 202 2. 4 9. 99 9 9 o d. 
Sho elio een DEVIATSXOE Te n 3 B B SEO TOT 4. Genus SrEnICcTOPSIs, Warren. 
VEIT ED DIES TWIANSNO E SOIL 6 8 — O1 OT BT TORRE 2. Genus Hzrrowuvsris, Meyrick. 
4. Abdominal crests very strong; hindwing with C. closely 
approximated to cell to beyond one-half. . . . 3. Genus Ruuwa, Walker. 
Abdominal cresis small ; hindwing with. C. diverging well 
2 AULA T p RS a 12 SU BI DNEPEEOSS MEE 5. Genus ARCHAEOBALBIS, nov. gen., Prout. 
1) Except in 44720Zasméa, which has strong 9 frenulum, and very slightly in Pserudotexbnza, which has moderately long, though very meagre 
Q frenulum. 
2) There are only four known Old World genera with complete frenulum and only two spurs, namely CxypsipAona, Synclysmns, Xenochroma 
and GzepAosema, all of which we refer high up in Group II ; but as the three last are rather anomalous, and little known, we have called special attention 
to them. In Group IV, so far as is known, the median spurs are invariably present. 
3) Not crested in A /odas»a, and not or only slightly in /ZerocAxoma, Actenzocihroma and. gzgristis., 
