176 MALACODERMATA. 
middle curves upwards. From Spinola’s description of H. bicarinata (a Brazilian 
species) it is not clear whether that species has two carine, or one only and the 
reflexed margin; but it is evidently a species of the same section as the present one. 
H. cryptocerina bears some resemblance to H. cincta. The antenne are yellow with 
the apical joint a little darker, the head is bluish with the mandibles and mouth a 
little pitchy. The front can scarcely be seen to be punctured with a Coddington lens, 
but is rough and clothed with a few ashy hairs; the thorax is about as long as wide at 
the widest part, roughened behind, very indistinctly carinate. ‘The elytra are very 
roughly punctured, not shining between the punctures as in H. cincta, but here and 
there clothed with ashy hairs, which are most evident along the carina, on its inner 
edge, and towards the apex of the elytra. There is usually a space on each side of the 
fascia free from them, which hence appears black and throws up the fascia, reminding 
one of Clerus contractus. It appears to me, indeed, that both of these species mimic 
ants of the genus Cryptocerus, or vice versd, the white fascia of the beetles giving them 
the requisite constricted look, and the white parts of the Cryptocerus withdrawing from 
observation those parts which would, if seen, destroy the resemblance. 
22, Hydnocera impressa. (Tab. IX. fig. 7.) 
Nigro-cwrulea, nitida; elytris fortiter punctatis, obsolete carinatis, margine leviter sinuato, lineis duabus 
obliquis, e pube cinerea formatis, ad scutellum conjunctis. Long. 4-5 millim, 
Hab. Panama, Volcan de Chiriqui (Champion). 
Var.? Pedibus basi et interne testaceis, elytris puncto cinereo pubescente tantum ornatis. 
Hab. Mexico, Cordova (Salle). 
Readily separated from H. bituberculata (which follows) by the elytra being evenly, 
though sparingly, punctured throughout, and by their being more parallel. The 
humeral carina is not very distinct. The line of shining ashy hairs is very oblique; 
starting from near the scutellum, it reaches the margin behind the middle. The thorax 
is narrower, less swollen at the sides in front. ‘The specimen from Mexico certainly 
differs from the typical ones in several respects; but its punctuation and parallel form 
are those of this species. Nine specimens were taken at Chiriqui, one of which is 
figured. 
23. Hydnocera bituberculata. 
Hydnocera bituberculata, Chevy. Rev. et Mag. Zool. 1874, p. 71°. 
Hab. Mexico, Cordova! (Sallé); Guatemaa, San Juan (Champion); Panama, Bugaba, 
David, Volcan de Chiriqui (Champion); Nicaragua, Chontales (Janson). 
The elytra in this insect are coarsely punctured at the base, but much more obsoletely 
and sparingly so in the apical half, where also they are a little widened. ‘The thorax 
