74 MONOGRAPH OF THE COLEOPTEROUS FAMILY PAUSSIDA. 
rotundata instructe (fig. 1 a). Mazille parvee lobo basali crustaceo, processu terminali 
vel interno plano acuto corneo valde compresso mandibuliformi laterne interno uni- vel 
bi-dentato externoque stylo tenui exarticulato instructe (fig. 1 e—1 7). Palpi mazil- 
lares magni 4-articulati articulo basali brevi, 2ndo maximo apicé interne oblique pro- 
ducto compresso, 3tio subquadrato, 4to tenuiori subovato. Mentum breve transversum 
crustaceum, angulis anticis in spinam longam productis, medioque marginis antici sub- 
rotundé porrecto (fig. prox. 1d). Palpi labiales breves 3-articulati porrecti vel reflexi 
articulo Imo brevi* duobus ultimis subequalibus, 1mo crassiori, 3tio tenuiori apice 
acuto. Labiwm subquadratum basi in lobos duos interne connexos (palpos gerentes) 
constructum, f margine antico integro, angulis anticis rotundatis. Antenne magne 
articulis quasi duobus, priori minori compresso, apice obliqué marginato, angulo interiori 
supra producto feré conico; tunc articulus? parvus subglobosus emarginature prioris 
immersus : cui insidet articulus ultimus maximus subplanus valde depressus et inferiori 
subtransversé impositus; margine omni compresso acuto basi truncatus et externe 
incisus vel dentatus: etiam juxta basin superné transversim impressus (articulorum 
divisionem referens); nec basi uncinatus. Thorax planus brevis transversus latior, 
lateribus anticis rotundatis. Elytra thorace multo latiora, postice subtruncata oblongo- 
quadrata depressa angulis posticis externe tuberculo ordinario instructis. Pedes brevi- 
usculi crassi, ¢ibiis dilatatis, calcaribus duobus, ad apicem armatis, angulis externis 
apicalibus acutis. T'arst breves, 5 articulati, articulis tribus basalibus compressis intus 
pilosis, 4to minutot; 5toque tenui longiori levi cylindrico, unguibus duobus acutis 
instructi. Al@ ut in, Paussis. Abdomen elytris paullo longius, 4-articulatum articulis 
duobus intermediis brevissimis ||. 
The insects of the present genus appear to be intermediate 
between those species of Paussus which have the prothorax not 
strongly constricted across the centre, and the Cerapteri. In their 
biarticulate antenne and the formation of their maxillary palpi, 
they approach the former; and in the general habit of their bodies, 
as well as in the formation of the basal jomts of their tarsi, and in 
the tendency to articulation exhibited in the clava of their antenne, 
they approximate to Cerapterus, Platyrhopalus angustus, and the 
two species which, in the Linnzean Transactions, I described under 
the names of “ Platyrhopalus? levifrons” and ‘‘ Platyrhopalus ? 
dentifrons,” (but which I now find, by an examination of their 
trophi, to be species of Paussus,) serve to prove the former relation- 
ship, whilst Platyrhopalus Melleii sufficiently attests the latter. 
In a preceding article (pp. 1O—12) I have quoted some observa- 
tions by Dr. Burmeister, upon the construction of the wings of 
* In the Linnzan Transactions (xvi. 655), and ante p. 5, the joints of the labial palpi 
were described as of equal, or nearly equal, length. The present description is made from a 
very careful recent dissection of P. denticornis compared with the other species. 
+ In the specimen of P. denticornis which I dissected fourteen years ago, the basal portion 
of the labium seemed more regnlarly divided into two scapes, upon which the palpi are in- 
serted, than in the specimen of the same insect recently examined. 
t+ In wy paper in the Linnzan Transactions, I overlooked this minute joint, which, how- 
ever, I detected in P. Mellii and Westwoodii, Linn. Trans. xvi. p. 684. and Ent. Trans. ii. 
pl. 10, fig. 42,5, 5d. 
|| Mr. W. W. Saunders’ unique specimen of P. Westwoodii has the appearance of an additional 
basa! articulation, which led me to figure the abdomen as 5-jointed in the Entomological 
Transactions. I find, however, the articulation is only apparent, and not real. 
