438 J. THOMSON. — SYSTEMA CERAMBYCIDARUM. 
4° GROUPE. IB(DIONITÆ. 
Corpus elongatum; ç' antenne longissimæ, © 
elongatæ, artic. {US crassus, vel basi excavatus vel 
haud excavatus, artic. 3° seq. longiore, articulis 3-5 
pl. m. ve dilatatis vel haud carinatis vel carinatis: 
prothorax elongatuscylindricus later inermis; femora 
postica nec corpore longiora; genua interm. et postica 
nullomodo spinosa. 
Facies lbidionis ; frons inermis; antenn. artic. 1us 
subelongatus, basi valdè excavatus, ,' artic. 3-4 valdè 
dilatatis et supra carinatis ;- femora postica corp. ex- 
trem. manif. transientia ; genua poshica utr. parte 
paul producta : 
Facies Ibidionis; antennæ corpor. extrem. haud 
attingentes, artic. 1° subelongato grocile , integro, 
artic. 3-5 robustis, 3-10 supra carinatis, artic. 4° 
prec. duplù breviore; femora postica corpore bre- 
viora ; genua înterm. et postica conjunctim 8 spinosa : 
Facies Jbidionis; antennæ corpore longiores, artic. 
1° sub-crasso apice sub-excavato, 3° seq. dupld lon- 
giore ante medium carinatus, ad medium subito et 
abruptè dilatatus ; femora postica corpore breviora; 
genua înterm. et postica conjunctim 8 spinosa : 
Facies Cycnidolonis; antennæ corpore longiores, 
artic. 1° subelongato, integro, 3° valdè dilatato ovoïdale 
10 longiore, 4° primo breviore , 5° prec. longiore; 
elytra apice 4-spinosa et bilunulata ; femora postica 
corpore breviora; genua interm. et poslica conjunc- 
tim 8-spinosa : 
Facies G. Ibidionis ; s antennæ corpore multum 
longiores, artic. 1° crassiusculo integro, 3-5 paul 
dilatatis, 3-7 supra longitud. carinatis, 3° seq. lon- 
giore; w femora postica corpore pauld transientia ; 
genua interm. et postica conjunctim 8-spinosa : 
G. Ibidion. 
(p. 215.) 
G. Lylibœum. . 
(p. 216.) 
G. Engyum. 
(p. 216.) 
G. Cycnidolon. 
(D'A21TE) 
G. Phormesium. 
(p. 217.) 
G. Octoplon. 
(p. 218.) 
