4 HETEROMERA. 
hidden in repose, clasped by the mandibles; ligula scarcely visible; head broad, feebly trilobed, almost 
rounded in front, the epistoma a little produced, rounded, and deflexed in the middle, the lateral lobes 
rounded and a little swollen but not prominent; prothorax very short and transverse, closely fitting to the 
elytra; elytra ovate, with regular rows of coarse punctures, the apices finely mucronate, villose ; antenne 
long, thin, third joint about half as long again as the second, fourth to eighth decreasing in length, ninth 
to eleventh larger and broader, the ninth and tenth triangular, the eleventh ovoid ; apical joint of maxillary 
palpi narrowly and feebly triangular; legs short, the tarsi stout, densely clothed with short hairs beneath ; 
metasternum short; intercoxal process pointed in front; prosternum very narrow, declivous behind, not 
contiguous to the mesosternum ; epipleure rather broad at shoulders, narrowing behind and not reaching 
the apex; eyes almost rounded; scutellum transverse, very small; intermediate coxal cavities closed 
externally. 
Founded upon one Mexican species. This genus is allied to Hurymetopon, Trimytis, 
and Emmenastus, though differing greatly from all of them in the structure of the 
antenne, and by its hairy clothing; allied also to Hdrotes and more distantly to 
Amphidora &c., which are similarly clothed with long hairs. The legs are compa- 
ratively short and stout. The antenne long, with the last three joints distinctly 
larger. 
1. Pescennius villosus. (Tab. I. fig. 6.) 
Ovate, brown or brownish black, slightly shining, clothed with short yellowish decumbent hairs, and the elytra 
in addition with long erect pale yellowish hairs. Head coarsely and closely punctured, the vertex longi- 
tudinally rugulose; prothorax convex, with very coarse rounded impressions placed close together and 
more or less confluent, strongly transverse, feebly rounded at the sides, widest just before the base, a little 
narrowed anteriorly to the slightly prominent front angles, slightly impressed transversely before the 
almost truncated base, the anterior margin broadly but feebly emarginate; elytra a little wider than the 
thorax, rounded at the sides, widest about the middle, very convex, with rows of deep rounded impressions 
distinct to the apex, the impressions close together, the first two rows turning off obliquely towards the 
shoulders near the base and making room for a very short scutellar row ; interstices flat, finely and sparingly 
punctured, humeral angles obtuse, base almost straight. Beneath reddish brown, shining, with large 
rounded very coarse punctures, the abdomen towards the apex more sparingly and finely punctured. 
Legs and antenne red. 
Length 6 millim. 
Hab. Mexico, Tehuacan (Hoge). 
Found in plenty by Hoge. 
SCEMTAS. 
Mentum rather large, transverse, slightly angular at the sides, closely fitting to the short side pieces of the 
. submentum, very coarsely punctured; mandibles with a strong tooth on the upperside; labrum not 
prominent, almost hidden by the epistoma; maxillary palpi stout, short, last joint broad oval; ligula not 
visible ; head broad, feebly trilobed in front, the central lobe of the epistoma rounded and slightly deflexed, 
lateral lobes rounded, not swollen or prominent; eyes large, rounded, not carinated within; prothorax 
transverse, convex, coarsely punctured, closely fitting to the elytra; elytra ovate, rounded at the sides 
strongly convex, with scattered appressed hairs, and regular rows of coarse punctures; antennx short, 
thickening a little outwardly, last joint oval, smaller than preceding; legs short and stout, tarsi stout, 
with short spiny hairs beneath ; intercoxal process rather broad, rounded at the apex ; epipleurze distinct 
throughout, narrowing from the shoulders; intermediate coxal cavities closed externally ; scutellum small, 
transverse. 
One inconspicuous species from Mexico. Semias is allied to Trimytis, but with the 
