LONGICORNIA. 381 
deres on the same grounds as Discopus, Pteridotelus, Tetrasarus, and Plagiosarus are 
separated, namely, differences in the clothing and structure of the antenne. In all 
other respects these genera agree with Acanthoderes, and in some of them the con- 
tained species have little resemblance to each other, except that which their antennal 
structure gives them. 
The typical species of Sychnomerus has greatly the appearance of a Pteridotelus ; but 
it wants the dentiform processes of the undersides of joints 7, 9, and 10 which charac- 
terize that genus; what seem to be such processes in Sychnomerus prove on close 
examination to be dense tufts of hair. 
1. Sychnomerus hirticornis. (Tab. XXIII. fig. 11.) 
Preridoteli laticorni similis, sed relative multo brevior ; ochraceo-cinereus fusco-punctatus, antennis articulis 
3°-7™ apice, 8°-11™ toto, nigris ; thorace lato, dorso tricarinato, carinis exterioribus abbreviatis, tuberibus 
lateralibus magnis conicis; elytris subtrigonis, sparsim grosse punctatis, apice angustis truncatis, angulo 
suturali subacuto exteriori prolongato, carinis dorsalibus validis basi late divaricatis ibique crenatis ; corpore 
subtus medio nigris nitidis. 
Long. 4-63 lin. ¢ 9. 
Hab. GuatemaLa, El Tumbador, Cerro Zunil (Champion). 
Captured in great abundance by Mr. Champion. 
2. Sychnomerus barbiger. (Lab. XXIII. fig. 12.) 
Ovatus, niger, nitidus; fronte, thorace vitta utrinque lata, elytris plaga magna humerali, alteraque communi 
apicali (postice ad marginem trisinuata) albis nigro-guttatis; thorace tuberibus dorsalibus conicis parum 
elevatis, carina dorsali obsoleta, tuberculis lateralibus validis acutis, plagiatim grosse punctato ; elytris 
brevibus apice oblique truncatis, sparsissime et grossissime punctatis, carinis dorsalibus nullis, tuberibus 
centro-basalibus vix elevatis granulatis; pedibus nigris; tibiis medio late albo-annulatis, anticis gradatim 
mediocriter dilatatis; tarsis articulis 1° et 4° griseis; antennis (2) quam corpus brevioribus, robustis, 
articulis 3° et 4° conjunctis quam cetera sequentia longioribus, 3°-11™ apice subtus longe nigro- 
barbatis ; nigris, articulo 4° dimidio basali testaceo, cxteris basi anguste griseis. 
Long. 4 lin. 
Hab. Guatemaua, Sinanja (Champion). 
One example only. The antennz are rather more densely tufted at the apex of the 
third and fourth joints, and therefore approach the structure of the genus Tetrasarus ; 
but the long beard of black hairs at the apices of the third and fourth joints does not 
form a compact brush as in that genus; it depends from the under surface only, and 
is repeated on all the following joints from 6 to 11. 
AMBLYSAPHES (to follow the genus Sychnomerus). 
Gen. Acanthoderi affinis. Differt capite ab occipite usque ad labrum curvato, fronte brevi, genis obtusissimis ; 
mandibulis brevibus, crassis ; thoracis dorso simplici, convexo, tuberculis lateribus parvissimis acutis ; 
tibiis intermediis ante apicem leviter sinuatis; prosterno arcuato mesosternoque gradatim declivi. 
- The insect on which this new genus is founded recedes too far from Acanthoderes, 
