THISTAS, 103 
behind; anterior cox contiguous, the cavities open behind and closed laterally; intermediate coxe 
narrowly separated, with distinct trochantin ; hind coxe transverse, rather widely separated by the broad 
and acutely triangular intercoxal process; legs rather short, the tibial spurs very small, the penultimate 
joint of all the tarsi broadly lobed beneath, the first joint of the hind tarsi not so long as the other joints 
united, the claws towards the base angularly dilated within; body obovate, moderately elongate, a little 
depressed above, winged. 
This distinct genus includes a single species from Central America. It is not closely 
allied to any other yet described, though approaching Hurypus in some of its characters. 
Most of the specimens obtained of 7. marmoratus were found in forest-clearings, 
about the withered branches of fallen trees or upon leaves. 
1. Thisias marmoratus. (Tab. V. figg.7; 7a, labium; 76, maxilla and 
maxillary palpus.) 
Varying in colour from fulvo-testaceous to reddish-castaneous, the entire upper surface to a greater or less 
extent irregularly spotted or marbled with piceous or black, slightly shining, and somewhat thickly 
clothed with ashy or brownish pubescence. Head closely and not very finely punctured ; antennee flavous 
or testaceous ; prothorax moderately transverse, rather wider at the base than at the apex (more distinctly 
so in some examples than in others), the sides angularly dilated about the middle, the base very feebly 
bisinuate, the disc with a more or less distinct oblique groove on each side about the middle and some- 
times deeply longitudinally impressed in the middle at the base, the basal impression usually connected 
with the deep fovex by a fine groove, the surface very closely and finely punctured; elytra with shallow 
longitudinal grooves, punctured like the prothorax, the suture slightly depressed before the apex; beneath 
castaneous or testaceous, more or less stained with piceous, very closely and finely punctured, the meta- 
sternum more sparsely, the head and the flanks of the prothorax more coarsely and densely so; legs 
testaceous, the femora sometimes a little darker. 
Length 33-53 millim. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith); Guaremata, Volcan de Atitlan, 
Pantaleon, Mirandilla (Champion); Panama, Volcan de Chiriqui, San Lorenzo, Pefia 
Blanca (Champion). 
Numerous examples. 
Fam. PYTHIDZ. 
This is a family of small extent, and, like the Melandryide, more numerously 
represented in temperate than in tropical regions. From Central America we have to 
enumerate seven species only, six of these being described as new. Homalirhinus, 
Chevr. (=Rhinomalus, Gemm., = Xenorhinus, Lec. & Horn), species of which are not 
uncommon in Central and South America, was referred to this family by Chevrolat (and 
this position is adopted in Gemminger and Harold’s Catalogue) ; but this, as pointed out 
by Leconte and Horn [Class. Col. N. Am. p. 134 (1883)], is a mistake, the genus, in 
reality, belonging to the Cucujide. Cononotus may eventually be found to inhabit 
North-west Mexico; the three species described are from California, and are said to 
occur under stones. ‘The other members of this family are found under bark or about 
the dead branches of trees. 
