266 SUPPLEMENT. 
15. Ibidion tenuissimum. (Tab. XVII. fig. 24.) 
Parvum, cylindricum, angustissimum, nigrum ; thorace postice, pectore elytrisque basi, lete fulvis, his utrinque 
lineola obliqua elevata ante medium fasciaque angusta subrecta post medium, eburneis, fascia fulva basali 
per suturam usque ad elytrorum dimidium excurrente; oculis vix convexis; tuberibus antenniferis 
conjunctis parum elevatis ; antennis fulvis apicem versus interdum infuscatis, scapo brevi modice clavato, 
d articulis 3°-6" perparum incrassatis cylindricis nec complanatis, 3° subtiliter carinato, 4° quam 5" triente 
breviori; thorace cylindrico postice gradatim angustato alutaceo-opaco et punctato ; elytris apice conjunctim 
rotundatis confuse (basi grossius et sparsius) punctatis ; prosterno et coxis normalibus, femoribus subito 
clavatis ; tibiis posticis extus haud carinatis. 
Long. 23-32 lin. ¢ @. 
Hab. Mexico, Guanajuato (Dugés, coll. Sallé), Cerro de Plumas (Hoge). . 
In form, colours, and markings much resembling J. semirufum, but differing inter alia 
by its opaque thorax. 
16. Ibidion chiriquinum. 
Cylindricum, piceo-fuscum, passim setosum ; elytris castaneo-rufis utrinque maculis duabus testaceis late fusco- 
marginatis, prima latiori ante medium suturam attingenti, secunda angustiori paullulum obliquo longe 
post medium, antennis pedibusque obscure rufo-castaneis; tuberibus antenniferis subacutis; antennis 
supra setosis infra, ciliatis, ¢ sicut in Heterachthi ebeno articulis 3°—6™ elongatis crassis nec carinatis, 7°-11™ 
tenuioribus ; thorace anguste cylindrico, incumbenti-pubescenti, dorso inequali medio tuberculo angusto 
parvo ; elytris crebre confuse punctatis, apice breviter obtuse truncatis; prosterno inter coxas sat elevato, 
coxis parum exsertis ; femoribus brevibus clavatis, inermibus, tibiis posticis haud carinatis. 
Long. 4 lin. 
Hab. Panama, Volcan de Chiriqui (Champion). 
This species presents most of the structural characters of the genus Heterachthes, 
Newman, but the form and style of markings are those of the species of [bidion 
generally. 
17. Ibidion erythrocephalum. 
Ibidion erythrocephalum, White, Cat. Long. Col. B. M. ii. p. 224. 
Hab. Guatumata (Deby). 
The legs were deficient in the example described by White. 
18. Ibidion asperulum. (Tab. XVIII. fig. 21.) 
Sublineare, nigro-fuscum, griseo-pubescens et setosum, immaculatum ; tuberibus antenniferis obtusis; thorace 
valde elongato, basi angustato, crebre minute punctulato; elytris relative brevibus, apice obtusissime 
truncatis, depressis creberrime punctulatis tuberculis parvis nonnullis asperatis ; pedibus brevibus, femoribus 
gradatim sed valde clavatis, tibiis posticis haud carinatis ; antennis ¢ quam corpus fere duplo longioribus, 
robuste filiformibus, scapo brevi incrassato antice impresso, articulis 3°-6"™ quam ceteri paullulum crassi- 
oribus subtiliter carinatis, 4° quam 5"° paullo breviori ; omnibus subtus sat longe et dense ciliatis. 
Long. 4-6} lin. g 9. 
Hab. Mexico, Ventanas (Forrer). 
