102 HETEROMERA. 
separated, the cavities almost closed; metasternum convex ; legs slender, rather short, the tibial spurs 
very small, the penultimate joint of all the tarsi lobed beneath; body subconical, moderately long, rather 
convex, winged. 
A single species from Central America is referred to this genus. Physcius is closely 
allied to Cleodeus, but differs from it in the form of the maxillary and labial palpi and 
also in that of the antenne. PP. conicus has much the facies of some of the more 
elongate forms of Xylophilus, from which genus, apart from other characters, it may be 
distinguished by the head not being sharply cut off behind. The antenne have joints 
4-10 short and angularly dilated within. The chief character of the genus, however, 
is the elongate-pyriform (almost subulate) apical joint of the labial palpi. 
1. Physcius conicus. (Tab. V. figg. 6; 6a, labium; 64, maxilla and maxillary 
palpus.) 
Piceous-black or piceous, the sutural region of the elytra sometimes obscure castaneous, the surface clothed 
with short ashy pubescence and slightly shining, the oral organs more or less testaceous. Head coarsely 
and rather closely punctured; antenne yellow; prothorax transverse, as wide at the apex as at the base, 
the sides very feebly rounded anteriorly and slightly sinuate behind or almost straight, the hind angles 
rectangular, the disc with an oblique impression on each side about the middle, the impressions only 
separated behind by an indistinct median ridge (more distinct in some examples than in others), the 
surface closely and finely punctured; elytra closely and finely punctured and with traces of very shallow 
longitudinal grooves, the suture slightly depressed before the apex ; beneath densely and finely punctured, 
the metasternum more sparsely and more coarsely so; legs (including the coxe) yellow, the femora some- 
times a little darker. 
Length 2-22 millim. (3 2.) 
Hab. Mexico, Teapa in Tabasco (H. H. Smith); Panama, Bugaba, Volcan de Chiriqui 
(Champion). 
Var. Larger, the eyes not so coarsely granulated, the head, except a patch on the middle of the vertex, 
reddish-testaceous. ( 9.) 
Hab. Panama, Volcan de Chiriqui (Champion). 
Numerous examples of the type, one only of the variety. 
THISIAS. 
Last joint of the maxillary palpi long and narrow, gradually widening outwardly, and very obliquely cut off 
at the apex, the apical side about as long as the inner and not much more than half the length of the 
outer side; last joint of the labial palpi cylindrical, the apex truncate ; mentum strongly transverse, the 
sides rounded; ligula prominent, as broad in front as the mentum, its anterior margin broadly and 
shallowly arcuate-emarginate; mandibles feebly cleft at the apex; head horizontal, scarcely narrowed 
behind, the epistoma limited posteriorly by a shallow transverse groove and laterally by a deeper 
longitudinal one, the antennary orbits not raised; eyes oblong, entire, lateral, moderately large, coarsely 
granulated, feebly convex and not very prominent, and very widely separated above and beneath; 
antenne short, not reaching the base of the prothorax, moderately stout, joint 3 more slender and 
rather longer than 2, joints 4 and 5 subequal and each shorter than 3, 5 wider than 4, 6-10 the 
broadest and angularly dilated within, all rather broader than long, 11 ovate and about twice as long as 
10; prothorax transverse, with deep basal fovee, the sides immarginate; scutellum rather small; elytra 
wider than the prothorax, moderately long, widening from the base to beyond the middle, very obtuse 
