464 RHYNCHOPHORA. 
Division I. 
Groupe I. Tylodides, Lacordaire, Faust. 
TYLODINUS, gen. nov. 
Rostrum stout, not longer than the prothorax, widened towards the base; antenne# inserted at about the 
middle of the rostrum, joint 2 of the funiculus as long as or longer than 1, 3-7 short, the club elongate- 
ovate (7. nodulosus, &c.) or ovate; eyes somewhat reniform, widely separated; prothorax hollowed in 
the middle or subtruncate at the base, the ocular lobes small; scutellum wanting or not visible ; elytra 
connate, tuberculate ; mesosternum large and prominent, semicircularly emarginate in front; metasternum 
very short; metathoracic episterna rather broad, short, and more or less fused with the metasternum ; 
ventral segments 3 and 4 very short, together about as long as 2, 1 and 5 much longer, the first suture 
curved ; femora feebly dentate or unarmed ; body apterous. 
Tylodes nodulosus, Boh., is taken as the type of this genus, which also includes 
various other Central-American species. These insects cannot be associated with 
T. armadillo (Sahlb.), the type of Tylodes, which is without visible metathoracic 
episterna, nor with Z. ganglionicus, Boh.*, in which the side-pieces are long and 
sharply defined and the ventral segments 1-3 are subequal in length. Two groups of 
species are included under Tylodinus, one with an elongate, and the other with an 
ovate, antennal club. In TY. 16-¢uberculatus and T. canaliculatus the episterna are 
fused with the metasternum, and the suture is either obliterated or only just traceable 
in front. T. cavicrus has the tibie very peculiarly formed, but this character may 
be sexual. 
a. Femora dentate: species larger. 
a’. Antennalclubelongate . . . . . .. . . 2. ee) CSpecies 1-4. 
b’. Antennal club ovate. 
a’. Tibi not excavate within . 2. 2... 1. 1. . we ee ee) CSpecies 5-8. 
6. Anterior and intermediate tibie excavate within. . . . . . . . . Species 9. 
6. Femora unarmed: species very small . . . . . . 1... « ss « « Species 10. 
1. Tylodinus nodulosus. (Tab. XXII. figg. 26, 26 a, 6, 3.) 
Acalles nodulosus, Boh. in Schénh. Gen. Cure. iv. p. 830°. 
Tylodes nodulosus, Schéuh. op. cit. viii. 1, p. 408”. 
Hab. Mexico!? (Mus. Holm., Mus. Brit.). 
I have seen two specimens of this species, including the type. It is distinguishable 
by the transverse whitish patch on the head, the excavate disc of the prothorax, the 
two large prominences on the third elytral interstice (the posterior one being very large, 
truncate behind, compressed, and lamelliform), and the feebly dentate femora. ‘The 
antennal club is a little longer than the preceding five joints of the funiculus united, these 
being short and subequal in length ; the second joint of the latter is very elongate. 
* Lacordaire has noted that 7. ganglionicus does not really belong to T'ylodes. 
