144 HETEROMERA. 
DIGZDUS. 
Diedus, Leconte, Class. Col. N. A. p. 338 (1862); id. New Sp. Col. p. 181 (1866); Horn, Rev. Ten. 
of Am. north of Mexico, p. 365; Lec. & Horn, Class. Col. N. A. p. 381. 
A single species only of this genus is known; it inhabits the whole of North 
America, according to Dr. Horn, and is found beneath pine bark. I include it in our 
fauna somewhat doubtfully on the authority of a mutilated specimen captured by 
myself in Guatemala. 
1. Diedus punctatus ? 
Diedus punctatus, Lec. loc. cit. p. 288°; id. New Sp. of Col. p. 131°; Horn, loc. cit. p. 365. 
Hab. Nortu America, Atlantic States 1, Middle and Southern States ?.—? GUATEMALA, 
Chilasco 6000 feet (Champion). 
A single specimen (without antenne) from Guatemala is apparently referable to this 
or an allied species; it differs from a type of D. punctatus contained in Mr. F. Bates’s 
collection in being larger, the head not so closely and more coarsely punctured, and 
not so deeply sunk into the prothorax. 
ARRHABAUS. 
Mentum trapeziform, deflexed at the sides, bisinuate in front, the anterior angles produced; lobes of 
the maxille armed with coarse spiny sete; last joint of the maxillary palpi elongate ovate; ligula 
strongly exserted, transverse, broadly rounded in front; mandibles projecting, slightly cleft at the apex, 
clasping the prominent labrum (between which and the epistoma a dividing clypeus is to be seen in many 
specimens), subangular on the other side; antenne short, reaching to about the middle of the prothorax, 
the first joint stout, the second smaller, the third short, and scarcely longer, though narrower, than the 
second, the fourth to the ninth transverse, and widening a little outwardly, the tenth twice the width of the 
ninth, transverse, and forming with the eleventh a stout, loosely articulated 2-jointed club, the eleventh 
twice as long as and the width of the tenth, broadly rounded at the apex; head short and broad, rather 
deeply sunk into the prothorax, the lateral margins of the front swollen and raised (in the male more 
strongly), not extending in front beyond the epistoma, nor beyond the inner upper margin of the eye 
behind ; epistoma confounded with the front, short, concave within in the male, the anterior margin 
broadly truncate; eyes lateral, rounded, a little distant from the prothorax; prothorax transversely 
convex, the disc broadly impressed in front in both sexes, the anterior face abruptly declivous, distinctly 
margined ; scutellum moderate; elytra alittle wider than and scarcely twice as long as the prothorax, very 
convex, coarsely and regularly punctate-striate (the sutural stria continuing direct to the base), without 
scuteilar stria, narrowly margined, the humeri distinct; anterior tibie armed on the outer edge with three 
or four coarse teeth, the intermediate pair similarly armed, but with the teeth finer; outer apical angles of 
all the tibis produced and dentiform, spurs strong; tarsi very sparingly clothed with hair beneath, first 
joint of the posterior pair the length of the two following joints united ; prosternum horizontal, the apex 
slightly produced and broadly rounded ; epipleurw broad, extending to the apex of the elytra. 
This genus includes a single species from Costa Rica and the State of Panama. 
Arrhabeus may be at once known from Diedus, which also has a 2-jointed club to the 
antenne, by its much more convex form, coarsely denticulated tibiz, differently formed 
thorax, &c.; it cannot be confounded with any other known genus. 
The single species is found in the forest-region beneath bark. 
