PSEUDHYPOPTUS.—COLEOCERUS. 305 
considerably developed below the base beneath, so that in the narrow males they 
appear to be rapidly narrowed from about the basal fifth. 
2. Pseudhypoptus eurylobus, sp. n. (Tab. XIV. figg. 10, 10a, ¢.) 
Oblong-ovate, rather convex, black; very sparsely clothed with small cinereous scales, the elytra with some 
denser patches or streaks of white scales along the flanks and towards the apex, the surface also set 
with short, decumbent, scattered sete. Head and rostrum densely, confluently punctate, the rostrum 
shorter than the prothorax and finely carinate along the sides. Prothorax transverse, narrowed 
and feebly constricted in front, the sides parallel at the base in ¢, the hind angles acute and 
extending outwards ; the surface densely, uniformly impressed with small rounded punctures. 
Scutellum transverse. Elytra convex, a little wider than the prothorax in ©, broader in 2, 
acuminate at the apex, the humeri not prominent; coarsely punctate-striate, the strie# becoming 
deeper at the apex, the interstices feebly convex and rugulosely punctate. Beneath finely punctate ; 
ocular lobes of the prothorax continued round to the anterior cox, and sharply separated from the 
prosternum ; first ventral segment deeply excavate down the middle behind in g. Tibi sharply 
unguiculate in ¢, unarmed in 9, the anterior and intermediate pairs obsoletely denticulate. 
Length 103-114, breadth 33-42 millim. (¢ @.) 
ITab. Mexico (ex coll. Solari: 3), Huetamo in Michoacan (/ége: @ ). 
One male and two females. Separable from P. parcus by the still more extended 
inferior portion of the ocular lobes, the less rugose rostrum, the acute hind angles of 
the prothorax, and the less distinctly margined base of the prothorax and elytra, the 
elytra a little wider than the prothorax in the male. The posterior tibie are without 
definite teeth. 
COLEOCERUS. 
Colecerus, Schéuherr, Gen. Cure. v. 2, p. 927 (1840) ; Lacordaire, Gen. Col. vi. p. 385. 
Coleocerus, Gemminger et Harold, Cat. Col. vil. p. 2374 ; Horn, Proc. Am. Phil. Soc. xv. p. 108. 
This genus includes a few small forms from the Southern United States, Mexico, 
and Guatemala *. It may be known by the deep, inferiorly confluent scrobes, the 
widely separated eyes, the prominent ocular lobes of the prothorax, the transverse, 
rather large scutellum, the protuberant mesosternum, and the free tarsal claws. 
The males have all the tibia more or less distinctly unguiculate (the uncus being 
usually shorter in the females and sometimes wanting on the posterior pair), and the 
fifth ventral segment slightly hollowed down the middle. ‘The deciduous portion of 
the mandibles is broad, somewhat cultriform, and vertical (fig. 14 @). 
a. Mesosternal protuberance long, blunt or truncate at tip ; rostrum deeply 
sulcate. 
a’. Prothorax sharply margined on each side at base. 
* Chevrolat (Bull. Soc. Ent. Fr. 1881, p. xxxvili) states that Coleocerus occurs also in Costa Lica, 
probably in error; his C. albidus, from Bogota, may belong to a different genus. 
+ The N.-American genus Aracanthus is an apterous form placed by Horn near Coleocerus ; it has a very 
minute scutellum and oval elytra. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 3, October 1911. 2RR 
