CRYPTOBIUM. 507 
validating the generic division into Cryptobium and Homeotarsus as proposed by 
Hochuth. 
Mr. Champion informs me that most of the species met with by him were found on 
the sandy banks of rivers and streams, beneath stones or decaying leaves; some were 
captured in dark places in the forests, others in the more open country; they were 
chiefly obtained during the dry season, at which period the streams dry up a good 
deal. 
§ 1. Elytra with a raised lateral line parallel with the side margin. 
1. Cryptobium collare. (Tab. XIII. fig. 12.) 
? Cryptobium ruficolle, Solsky, Hor. Soc. Ross. v. p. 142°. 
Sat latum, fusco-rufum ; capite elytrisque nigris; antennis pedibusque testaceis, thorace rufo; capite elytris 
paulo latiore, opaco, crebre sat fortiter punctato ; thorace crebre fortiter punctato, medio late impunctato ; 
elytris thorace longioribus, crebrius fortiter punctatis, subnitidis. 
Long. 13 millim. 
Hab. Mexico! (Truqui), Oaxaca (Hoge), Yantepec, Morelos (Flohr, coll. Sharp), 
Cordova (Sallé); Guatemata (Sallé), near the city, San Gerdnimo, Tocoy, Rio Naranjo 
450 feet (Champion); Nicaragua, Chinandega (Sal/é); Panama, Bugaba, San Feliz 
(Champion). 
Antenne with the scape rather short, third joint scarcely half as long again as the 
second. Head dull, its punctuation not dense nor deep, the punctures near the front 
larger and more distant, a broad space behind the labrum impunctate; eyes placed 
near the base of mandibles; neck broad. Thorax broad, but subcylindric, red, shining, 
a little longer than broad, rather coarsely and moderately closely punctate, with a 
broad space along the middle smooth. Elytra quite one and a half times as long as 
the thorax, their punctuation deep, coarse, and dense. Hind body rather broad, infus- 
cate red, with the apex paler, moderately closely and distinctly punctate. 
In the male the fourth ventral plate is furnished behind with a long lobe reaching 
quite as far as the extremity of the next segment; it is broad, but narrower behind, and 
fringed with numerous very long hairs; at the base of the fourth segment there is a 
small transverse setigerous impression, and on the middle of the preceding segment an 
elongate transverse line bearing a series of erect sete. 
In the female each of the third and fourth segments bears a circular fovea. In some 
examples of the male sex the ventral lobe is entirely absent, and I have found one 
example of this imperfect form in which also the setigerous impressions are much 
reduced in size. 
This species was met with plentifully both in Mexico by Herr Hoge, and in Guate- 
mala by Mr. Champion, but from the State of Panama only five individuals have been 
brought back. The Mexican examples exhibit but little variation from the description 
given above. The examples from Guatemala are usually rather smaller, and frequently 
3 TT 2 
