232 HISTERIDZ. 
they are generally of rare occurrence. In a series of about eighty species of Histeride 
from Japan the genus Teretrius is unrepresented. 
1. Teretrius rufulus. 
Teretrius rufulus, Mars. Monogr. in Aun. Soc. Ent. Fr. 1856, p. 189, t. 3. fig. 6°. 
Hab. Guatema.a, Yzabal (Sallé1).— AnTILuEs (coll. Lewis). 
2. Teretrius longulus, sp. n. 
Cylindricus, parallelus, brunneo-nitidus, undique sat dense et fortiter punctatus; antennis pedibusque rufis; 
pronoto stria marginali sinuato; prosterno lobo lato, basi leviter canaliculato, bistriato, fortiter punctato ; 
mesosterno antice acuminato, marginato, stria transversa postice a metasterno distincto; tibiis anticis 6-, 
intermediis 5-dentatis, posticis 3- vel 4-spinosis. Long. 2 millim. 
Hab. Mxxico, Guanajuato, Cordova (Sallé). 
This species is about the size of T. picipes(Fabr.), but is proportionally longer. The 
prosternum also is canaliculate, rather than impressed, at the base; the thoracic stria is 
more sinuate before the base ; and the punctures of the upper surface are conspicuously 
larger and much more dense. The strie of the prosternum are strong at the base, and 
gradually lessen until they disappear before the middle. 
3. Teretrius orbus, sp. n. 
Cylindricus, brevis, piceo-brunneus, pedibus ferrugineis, supra fortiter punctatus, subtus opacus, sparse ocellato- 
punctatus; pronoto stria valide integra, pone oculos leviter angulata; elytris stria basali obliqua; 
prosterno lato, haud striato; mesosterno late marginato, antice obtuso, stria utrinque interrupta; pygidio 
convexo, punctulato; tibiis anticis 6-, intermediis 5-spinosis, posticis spinosis. Long. 2 millim. 
Hab. Guatemaa, Pantaleon 1700 feet (Champion). 
One specimen. This species has the facies and general outline of a Teretriosoma, but 
as the pygidium is convex it is placed in Zeretrius. ‘The clearly defined oblique stria, 
which occupies one third of the length of the elytra, is similar to that of 7. obliquulus, 
Lec., and 7’. segnis, Mars. 
TERETRIOSOMA. 
Teretriosoma, Horn, Proc. Am. Phil. Soc. xii. p. 347 (1878). 
The more prominent representatives of this genus are from the New World; but one 
very distinct species has been captured in Ceylon (7. facetum, Lewis), and another, less 
typical (7. somerseti, Mars.), has been brought from Australia. Teretriosoma was 
established by Dr. Horn upon a single species, 7. chalybeum, from Texas; six are 
now known from Central America. The genus is very closely allied to Teretrius, and 
when more species of it are brought to light it may require to be re-characterized. At 
present the double pygidium is the chief character relied on to separate it from Teretrius. 
