156 LONGICORNIA. : ‘ 
1. Mecotetartus antennatus. (Tab. XII. fig. 14, 3.) 
Mecotetartus antennatus, Bates, Trans. Ent. Soc. 1872, p. 213’. ’ 
Eutessus asper, Leconte, Smithson. Miscell. Coll. No. 264, part ii. (1873), p. 236”. 
Hab. Norra America, Lower California 2.—Nicaragua, Chontales (Belt !). 
ALCIDION. 
Alcidion, Thomson, Classif. Longic. p. 12 (1860) ; Bates, Ann. & Mag. Nat. Hist. ser. 3, xu. p. 105 
(1863). 
In its more typical species, viz. those which are conformable to A. latwm (Thomson’s 
type), this is a well-marked genus, distinguished by its trigonal form of body, unarmed 
thorax, and by the high centro-basal ridges and the lateral and dorsal carine of the 
elytra. Many of the less typical species, however, degenerate in one or more of these 
features. Nearly thirty species are known, all Tropical-American. 
1, Alcidion latum. 
Alcidion latum, Thomson, Classif. Long. p. 12. 
Hab. Mexico, Cordova (Sallé). 
2. Alcidion eulophum. (Tab. XIV. fig. 3.) 
Elongatum, thorace parvo fere cylindrico, elytris versus apicem angustatis valde oblique sinuato-truncatis 
angulo exteriore elongato. Fuscum; elytris guttulis nigris lineatim seriatis, fasciaque pone medium M- 
formi fulva postice fusco-marginata et venis pallidis usque ad apicem, humeris haud productis, carina 
laterali acuta, dorsali obsoleta, carina brevi alta centro-basali; antennarum scapo subtus valde flexuoso, 
breviter dense ciliato, apice haud incrassato; tibiis anticis intus bisinuatis. 
Long. 34-5 lin. 
Hab. Mexico, Cordova, Chiapas (Sal/é); British Honpuras, river Sarstoon (Blan- 
caneaur); GUATEMALA, Capetillo, Cerro Zunil, Chiacam et Senahu (Champion). 
8. Alcidion furciferum. 
A, eulopho proxime affine sed multo brevius, elytris subtrigonis, mox ante apicem sat valde angustatis, absque 
venis pallidis, apice oblique sinuato-truncatis, angulo exteriore longe producto, thorace disco distinctius 
bituberculato, lateribus medio tumidis subtuberculatis ; fusco-griseum, tuberculis duobus thoracis guttisque 
elytrorum seriatim ordinatis nigris; elytris post medium fascia M-formi grisea postice nigro-marginata 
maculaque paullo posteriore. prope suturam nigra ; tibiis anticis intus bisinuatis. 
Long. 33 lin. 
Hab. GUATEMALA, Totonicapam (Champion). 
Although very closely allied to A. ewlophum, and having a similar high, sharply- 
compressed centro-basal carina, this species offers a very different facies, due to the 
much shorter and more triangular form of the elytra and the absence of the charac- 
teristic pale vein-like markings which in A. ewlophwm are seen between the M-formed 
