142 LONGICORNIA. 
14. Acanthoderes cornutus. 
Latiusculus, convexus, purpurascenti-fuscus, elytris fasciis incompletis tribus atro-fuscis, prima (versus basin) 
lituram communem cineream arietinam includente; fronte magna, planata; thorace tuberculis dorsalibus 
maxime elevatis apice truncatis, lateralibus conicis, linea dorsali elevata, interstitiis punctatis; elytris postice 
modice rotundato-angustatis, apice breviter sinuato-truncatis ; dorso atro-fusco punctatis, bicostatis, costa 
interiore juxta marginem basalem maxime elevata, compressa et tuberculata; antennis atro-fuscis, 
articulis a 2° basi albis, 3° et 4° medio albo annulatis, apicalibus simplicibus; corpore subtus medio 
nigro. 
Long. 73 lin. Q. 
Hab. Guatemata (Sallé). 
One example of this well-marked species (allied to A. clericus and A. sylvanus), in 
M. Sallé’s collection. 
TETRASARUS, 
Acanthoderi circumflexo et affinibus certe affinis, at differt antennarum articulis 3° et 4° scopiferis. Corpus 
minus elongatum. Oculi subgrosse granulati. Antenne utroque sexu articulis 3° et 4° ceteris multo 
longioribus, apice scopis e pilis elongatis sericeis vestitis; ¢ articulis 9°-11™ valde abbreviatis, infra setosis. 
Thorax dorso valde bituberculatus. Elytra dorso minus forte carinata, juxta apicem angustata. Tibise 
antice ¢ versus apicem dilatate, ? simplices. 
Thomson, in describing the first species of this form as a Discopus (a genus in which 
the third antennal joint only has a thick tuft of hairs), said that it merited to form a 
division apart. The tufting of the antennz, however, proves to be distinctive of two 
groups of species of which well-defined genera can be formed, distinguished by the 
general form of the body as well as by the antenne. There is a further distinction also 
in the shape of the tufts, which in Discopus encircle the joint all round, and in Tetra- 
sarus leave one side of the joints naked. The broad mesosternum in most of the 
species is steeply declivous in front and bituberculated, as in Acanthoderes swederi; in 
others it is unarmed. 
The genus seems peculiar to Guatemala and the adjoining countries north and south. 
\ 
1. Tetrasarus quadriscopulatus. 
Discopus quadriscopulatus, Thomson, Physis, ii. p. 146°. 
Hab. Guatemaa!, Zapote (Champion). 
2. Tetrasarus inops. 
Depressus, carneo-fuscus, elytris post medium fasciis incompletis angustis valde undatis, nigris, apice angustatis, 
oblique sinuato-truncatis, angulo exteriore paullulum producto, dorso obtuse costatis ; antennis ( 2) nigris, 
articulis 3°-11™ basi griseo-albis ; corpore subtus medio nigro ; mesosterno arcuato, simplici ; tibiis nigro 
biannulatis, tarsis griseis articulis 2°-3™ nigris. 
Long. 5 lin. 9. 
Hab. Muxico (H. Deyroile, coll. Bates), Parada, Oaxaca (Sallé). 
