FORNAX.— r CLADUS. 231 



This is one of the species, not by any means unique in the family, in which there is 

 difficulty in assigning a generic place. The entire facies is that of Fornax, while the 

 feebly limited antennal grooves suggest Plesiofornax. It is, however, best retained 

 here, and doubtless resembles F. sinuatus. 



15. Fornax insitus. 



Closely related to F. adjectus, and differing very little in the superficial characters, except as follows : — Front 

 not carinate ; interocular carina feebly elevated, not extending on the base of the clypeus, this about half 

 as wide at the base as the distance to the eye ; antennal groove deep, slightly punctured along its inner 

 edge, distinctly wider behind, but less than half as wide as the base of the propleural triangle opposite 

 that point ; last ventral segment slightly compresso-carinate at the apex. 



Length 7-8 millim. 



Hab, Panama, Bugaba (Champion). 



By the scheme of de Bonvouloir this species is related to F. badius and F. additus, 

 but differs from both in its narrower clypeus at the base and by the antennal grooves 

 beins* wider behind. 



CLADUS. 



Cladus, de Bonvouloir, Mon. des Eucnemides, p. 432 (1870). 



This genus belongs to the Fornax series, having a well-developed and defined 

 antennal groove, which is narrowed on the head by the large eyes. The prosternum in 

 front of the coxae is broadly flattened, even slightly concave, the apical portion (as seen 

 from below) abruptly elevated, carinate at the middle, and prolonged in an obtuse point. 



The most curious character is that presented by the mouth, which is not only unique 

 in the family but in the entire Coleopterous series. Of this de Bonvouloir makes the 

 following note : — " The parts of the mouth seem to be terminated by long stems, 

 slender and branching. Unhappily, the few examples before me have but fragments 

 of these parts, and render it impossible for me to say if they are palpi or appendices 

 of the maxillae." 



The appearance of the mouth beneath is as if the insect had grasped a small bunch 

 of pale moss or rootlets. 



The mentum is semicircular in outline, deeply emarginate, the emargination partly 

 filled with a membranous partition ; at the angle of the mentum is an oval appendage, 

 from the lower face of which arises a long ribbon-like extension, fimbriate on its 

 margins and pubescent on both sides. The labial palpi are modified out of all resem- 

 blance to organs of that character. They seem to arise at the emargination of the 

 mentum, and assume an arborescent appearance by dividing into four stems, of which 

 the innermost and third are again bifurcate, and the second and fourth simple. From 

 these stems shorter branches are given off on each side alternately, each branch ciliate 

 at the tip. 



The maxillse are bilobed, the outer lobe longer, in shape much like a boomerang, 



