OTHNIOCRYPTUS.—HOLOSTERNUS. 599 
phagide. The existence of a distinct, though small, true fourth joint on all the feet 
removes it, however, from those families, while the unusually short first ventral 
segment separates it from the majority of Cryptophagine. The antenne have an 
abrupt three-jointed club. The last joint of the labial palpi is small. The front cox 
are rather small, oval, not prominent, separated by a rather broad space which 
projects behind as a free process; the side-pieces are produced very little inwards. 
The tibiz and tarsi are slender, the former without any (except most minute) spines. 
The basal three joints of the feet are but little elongate, the first of them rather longer 
than the second; on the hind feet the basal joint is more elongate. ‘The first ventral 
segment is but little longer than the apical one. 
1. Othniocryptus variegatus, sp.n. (Tab. XVIII. fig. 17.) 
Testaceus, pube depressa irregulariter vestitus ; dense punctatus, irregulariter fusco-variegatus. 
-Long. 4 millim. ° 
Hab. Panama, Volcan de Chiriqui (Champion). 
Antenne moderately long, second and third joints subequal, the third a little the 
longer and more slender, the fifth and seventh slightly longer than the sixth and eighth ; 
club broad, rather laxly articulated. Head large. Thorax rather narrower than the 
elytra, a little curved at the sides, about equally broad in front and at the base, lateral 
and basal margins fine, but quite distinct. Elytra evenly punctured all over, without 
the slightest sign of any serial arrangement of the sculpture. 
The variegation is caused, to a large extent, by the hair, which differs in colour and 
arrangement here and there. The coloration is, however, evidently variable: on the 
elytra it consists of darker transverse bands, very irregular, and, with the exception of 
one or two, much broken up. Two specimens. 
HOLOSTERNUS, gen. nov. 
Corpus elongatum, nudum. Antenne breves; clava abrupta, triarticulata. Tarsi 5-articulati, articulis basalibus 
tribus subsequalibus, brevibus haud lobatis, subtus setosis; articulo 4° libero, 5° elongato. Coxee omnes 
parum distantes, posterioribus processu tenui, acuminato separatis, Abdomen segmento primo secundo 
paullo longiore. Prosternum elongatum, suture prosternales obsolete. 
This and the following genus are closely allied. They differ from the normal 
Cryptophagine in their facies, which suggests an alliance with Rhizophagine, to which 
group they approximate considerably by the structure of the feet and legs, but from 
which they differ in several characters of greater importance. The prosternum in 
front of the coxe is large. The front coxe are very minute, globular, placed quite at 
the back of the prosternum, separated only by a very small process, between which 
and the middle cox a wide space intervenes; the acetabula are not closed behind. 
The middle coxe are also small and globular, and are externally surrounded only by 
