CALYMMUS. 225 
the long stout horn, projecting horizontally over the head, on the front of the thorax 
in both sexes. 
1. Calymmus cucullatus. 
Calymmus cucullatus, Pascoe, Ann. & Mag. Nat. Hist. 4th ser. viii. p. 349, t. 14. f. 87. 
Calymmus asperulus, Pascoe, loc. cit. p. 350°. 
Hab. Mexico, Tehuantepec (Sallé), Cerro de Plumas (Hége); Guatemana, San Geré- 
nimo, San Joaquin, Balheu (Champion); Nicaragua, Chontales (Belt, Janson, coll. F. 
Bates); Panama, Volcan de Chiriqui (Champion).—Cotomsta 2 (coll. F. Bates); Braziu, 
Rio Janeiro }. 
Judging from the long series of examples before me, amongst which individuals are 
to be found of a comparatively longer form, and others in which the thoracic horn is 
rather more expanded and sub-bifurcate at the apex, I do not think C. cucullatus and 
C. asperulus (described from single examples and the types of which I have examined) 
can be maintained as distinct, some of our specimens being intermediate. 
I met with this insect sparingly in Guatemala and the State of Panama, beneath 
loose bark. 
2. Calymmus variegatus. (Tab. X. fig. 8.) 
Elongate, subparallel, black, variegated with greyish-ochreous scales. Head with the antennary orbits greatly 
swollen, raised, and subangularly extended in front; antenne with the closely articulated tenth and. 
eleventh joints large and stout; prothorax as long as broad, the sides very coarsely crenulate, scarcely. 
narrowing anteriorly, the anterior angles very prominent and extended forwards as far as the front of the: 
eyes, the posterior angles broad and subacute and outwardly directed, the disc gibbous, with a distinct 
central groove and two stout irregular tubercular elevations on each side about the middle, the horn in 
front long and stout and shovel-shaped at the apex, the surface (like the head) densely and uniformly 
clothed with greyish-ochreous scale-like hairs and with scattered smooth bare granular elevations; scu- 
tellum rounded; elytra long, convex, the width of the prothorax at the base, parallel for two thirds of 
their length, with three more or less interrupted tubercular ridges (the first distant from the suture and 
more strongly raised towards the base), numerous rows of impressions (coarse outwardly, finer and shallower 
within the first ridge), and some scattered granular elevations along the suture and towards the sides, 
the surface with scattered patches of greyish-ochreous scales; tarsi long. 
Length 10-113 millim. 
Hab. Nicaraeva, Chontales (Belt, coll. F. Bates). 
Four examples. This species is nearly allied to two undescribed South-American 
forms, which, to prevent future confusion, are perhaps best noticed here *. 
* Calymmus scabriculus, sp. n. 
Form of C. variegatus ; the prothorax less coarsely and more regularly crenulate at the sides, slightly narrowing 
anteriorly, the tubercular elevations on the disc smaller, the horn only slightly widening at the apex, the 
small granular elevations much more numerous, the surface less densely clothed with scales ; the elytra 
with the ridges not so well defined, much more interrupted, and formed of coarser tubercles, a row of 
rather coarse tubercles along the suture (feebly represented in C. variegatus), the scattered granular 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 1, November 1886. 2GG 
