Genera of Wingless Brachyderine. 1 
almost an equilateral triangle ; mandibles densely squamose 
(occasionally bare—P. sparsus, Fhs., and P. longulus, Boh.), 
multisetose, with a distinct median tooth, the sear variable ; 
mentum with numerous erect setze on the anterior half, 
usually arranged in a tuft of three to six oneach side, the basal 
half sunk in the cavity ; serobes passing well below the 
eyes, more or less squamose. Antenne with the scape 
slender, clavate, reaching about the middle of the eye; 
funicle squamose, joint 1 much longer than 2 (except in 
P. strigifrons, Fhs., in which they are equal). Prothorax 
variable in form, but always transverse and narrower at the 
apex than at the base. Seu/ellum invisible. Sternum with 
the gular margin more or less sinuate, the coxe about 
in the middle of the prosternum ; mesepister num usually, 
but not always, separated from the elytron by its epimeron ; 
metasternum much shorter than the mid- cox, with a more 
or less distinct antecoxal fold, the episternal suture com- 
plete, the episternum not pr oduced inwardly at the base and 
rapidly narrowing to a point behind, the hind coxe touch- 
ing the elytra. V enter with the intercoxal process narrower 
than the coxe, slightly angulate or gently rounded; hind 
margin of segment 1 shallowly sinuate, segment 2 much 
longer than 8. Legs with the corbels of the posterior pairs 
of tibiz squamose or bare, very oblique, with the upper 
fringe of sete ascending the dorsal edge of the tibia in a 
straight line, and the extreme apical edge narrowly enclosed 
(except in P. sparsus and its allies) ; claws connate. 
In the males the elytra are narrower than in the females ; 
the first ventral segment is very slightly impressed, and the 
last is shorter and more broadly ronnded ; in some species 
the legs are markedly stouter than in the females, 
Genotype, Strophosomus crucifrons, Bob. 
Distinguished from true Strophosomus by the setose 
mentum, the squamose mandibles and antenne, and the very 
oblique corbels of the hind tibiz. 
Apart from the species here assigned to the genera Pro- 
scephaladeres, Brachybamon, Pomphus, and Leurops, all the 
Atrican “ Strophosomus”’ known to me fall within the present 
genus; and, judging by the descriptions, this is also likely 
to prove true of S. ancorifrons, Boh., rotundicollis, Boh., 
crucifer, Boh., obsoletesiynatus, Boh., indoctus, Boh., pupil- 
latus, Boh., dilaticollis, Boh., denticollis, Quedf., hamaticollis, 
Pér., and concinnus, Hartm. The position of S. hystria, 
Fst. (Ann. Soc. Ent. Belg. 1899, p. 389), from the Congo, 
is doubtful, 
