164 MONOGRAPH OF THE 
a rather broad mentum, and have the two terminal joints of nearly 
equal size. The prothorax is flat, broader than the head, short, 
with dilated sides, the margin being rounded at the anterior 
angles ; whilst the hinder angles are acutely truncate, or rather very 
deeply and nearly semicircularly emarginate, leaving a narrow 
posterior lobe to the prothorax nearly as in the genus Lebia. 
The elytra are oblong-quadrate, with the base rather broader 
than the prothorax, smooth, shining, impressed at the base, and 
of a rather brighter colour than the rest of the body. The feet 
are rather slender, with the tibizee compressed at the tips, the outer 
angle being produced into an acute spine, and the inner angle 
furnished with two calearia; the tarsi are five-joited, but the 
fourth joint is very minute. 
Fig. 3 a, lower parts of the mouth in situ; *, the mandible ; 
3 b, maxilla ; 3 c, posterior tibia and tarsus. 
Grnus.——-PAUSSUS, Linneus. 
Corpus oblongum subdepressum ; caput mediocre prothorace angustius; antennarum clava 
maxima forme variabilis sepius irregulariter obtrigona, compressa vel subdepressa basi 
externe in hamum producto. Labrum subcoriaceum parvum transversum angulis anticis 
rotundatis. Mandibule cornez parvee basi dilatate apice falcate acute denteque in medio 
marginis interni membranaque coriacea interna basali quadrata instructe. Maxille stipite 
crustaceo (figs. *) processu terminali (interno) tenuissimo corneo mandibuliformi, valde 
arcuato et acute bidentato, spatio intermedio membranaceo (et in P. Hearsiano solum 
inveni rudimentum partis ille cornex in tab, 68, fig. 1. e—l., pugione f notate). Pal- 
porum maxillarium internorum vestigia nulla detexi. Palpi maxillares (externi) 
4-urticulati articulo 2ndo maximo seepius ad apicem interne acute producto. Mentum 
(ut videtur) rectangulare trianguliforme (hypothenusa antice transversa) lateribus 
obliquis capite coalitis, nec basi articulatum, angulis anticis lateralibus porrectis et in 
dentem subacutum productis. Labrum, os inferne claudens subquadratum corneum 
subplanum vel medio longitrorsum subcarinatum, margine antico integro vel carine apice 
in dentem parvum centralem producto. Palpi labiales maxillaribus breviores labioque 
longiores ad ortum subconnati (sc. interdum ia scapum parvum vel radiculam * inserti 
ut in P. mierocephalo) labiique faciem inferiorem velantes et marginem ejus anticum 
ultra extensi, interdum reflexi, 3-articulati articulis duobus basalibus brevissimis ultimo 
magno longe ovato aut cylindrico, subulato, apice acute. Prothorax subcylindricus 
vel truncato-cordatus paullo longior quam latior, plerumque quasi in duas partes 
divisus, parte antica plus minusve elevata. Scutellum parvum. Elytra prothorace 
latiora, oblongo-quadrata, postice truncata angulis posticis externis tuberculiferis. Pedes 
breves robusti plerumque dilatati; tibiis quatuor posticis sepius bicalcaratis. Tarsi 
5-articulati articulo basali sepius minuto. Abdomen 4-articulatum articulis duobus 
intermediis brevissimis. 
In my monograph upon this family, published in the Linnzean 
Transactions, I endeavoured, at considerable length, to clear up the 
confusion existing in the writings of Afzelius, Latreille, and others, 
as to the real structure of the parts of the mouth. Having at that 
aa 
* Ts it possible that this scape of the labial palpi can be the real representative of the 
mentuw, and that the part I have described as the mentum is in fact part of the skull? 
