THYREOCEPHALUS.—SAUROHYPNUS. 501 
the eyes. The thorax is slightly narrowed behind, and the elytra are not longer 
than it. 
Herr Hoge found three examples ; as one of them has the head narrower than the 
others, I conclude I have both sexes before me. In Guatemala Mr. Champion met 
with only a single example, and though it has the punctuation on the head not quite so 
dense, it is not sufficiently different to be treated as distinct at present. 
7. Thyreocephalus puncticeps. 
Nigerrimus, nitidus; elytris rufis, crebrius fortiusque punctatis; pedibus piceis, tarsis rufescentibus; capite 
oblongo-ovali, densissime fortiter punctato, opaco. 
Long. 17-20 millim. 
Hab. Mexico, Uruapan (fohr), Juquila (Salié). 
This species is closely allied to 7. rufipennis, but has the head very densely punctured 
and rather narrower, and the punctures of the elytra rather more numerous, especially 
near the suture. 
_ Only one example is extant from each locality. That from Sallé’s collection has 
‘the punctuation of the head a little less dense; but I feel sure the two belong to one 
species. They may be the sexes; if so, the differences of punctuation may be sexual ; or 
they may both be females, as the mandibles are shorter and thicker than they are in the 
male of any other species of the genus. 
8. Thyreocephalus cribripennis. 
Nigerrimus ; elytris pedibusque piceis, illis crebrius fortius profundeque punctatis ; capite oblongo-ovali, parce 
fortiter punctato. 
Long. 20 millim. 
Hab. Mexico, Cordova (Sal/é). 
This insect is similar to T. rufipennis, but has the elytra darker in colour and with a 
larger development of punctuation. ‘The head is quite sparingly punctate, so that it is 
shining like the thorax; the punctures at the sides of the latter are very coarse. 
Only one example has been received; to judge from it the species is well distin- 
guished from its allies by the fact that, in addition to the trivial characters, the labrum 
is less transverse and more prominent, its central notch being much larger, and it is 
nearly simply bilobed, the lateral angles (which are so evident in the other species) 
being in 7. cribripennis not distinguishable. The sex of this individual is unknown 
to me. 
SAUROHYPNUS. 
Labrum rugosum, quadrilobatum. Caput inter antennas processu lato conspicuo. Palpi elongati, articulo 
terminali elongato, latere interiore curvato apice acuminato; mandibule sat elongate. Prothorax linea 
superiore subtili, subtus valde deflexa. Mesosternum breve, leviter rotundatum. Tarsi simplices. 
The insect on which this genus is founded resembles the European Nudobius lentus 
