PYCNARTHRUM.—PRIONOSCELES. 177 
The front is flattened and sometimes subfoveolate in the male, subconvex in the 
female. The length varies from 1:8 to 2 millim. 
Neither of the type specimens is mature, and they differ inter se in the depth of the 
elytral punctures; but both forms are represented and are connected by intermediate 
examples in our series from Zapote. 
2. Pycnarthrum transversum, sp. n. 
Oblongo-ovatum, parum nitidum, piceum, elytris ad apicem dilutioribus, cinereo-squamulatum; prothorace 
transverso, antice constricto, subtiliter punctulato et parce squamoso; elytris a medio rotundatis, subtiliter 
punctato-striatis, interstitiis seriato-squamosis. 
Long. 2 millim. 
Differing from P. lambottei in the following points:—Prothorax much wider, distinctly transverse, with the 
anterior angles much more strongly rounded; interspaces between the punctures with an evident very 
fine reticulation. Elytra broader, only one-sixth longer than wide, punctures of the strie fine and not 
the large circular impressions found in the preceding species. Squamous pubescence a little coarser. 
Hab. GuateMata, Mirandilla (Champion). 
Four specimens of this species were taken by Mr.Champion. ‘Though closely allied 
to P. lambottei, it is not approached in shape by any examples of that species, and 
cannot be associated with it. 
‘Two more species of Pycnarthrum are represented in this collection by single examples 
from Zapote in Guatemala, and Chontales in Nicaragua. Both are immature and 
therefore unsuitable for description. P. pallidum (Chap.) from Guadeloupe is also 
immature, and the type is practically valueless. The insects collected from Mexican 
and Brazilian tobacco, and forwarded to me by M. A. Grouvelle, include several 
examples of different species of Pycnarthrum. 
PRIONOSCELES, gen. nov. 
Prothorax basi distincte marginatus, quam elytra vix angustior. Coxe antice et medic late distantes. 
Abdominis segmenta 3™ et 4™ brevia. Pedes longi; tibisze valide, versus apicem fortiter dilatate, extus 
serrate, mediz et posteriores ad apicem rotundate ; tarsi recepti. 
Form stout and robust. Head somewhat prolonged but scarcely rostrate, mandibles large and prominent ; 
mentum a little longer than broad, wider apically; labial palpi with joints 1 and 2 as long as broad, 
3 shorter, their outer surface densely setose ; maxillary lobe narrow, set in‘erually with close flattened 
spines; maxillary palpi with joints equal in length, successively narrower, the 3rd twice as long as 
broad. Antenne not very short, joints 2-6 of the funiculus increasing moderately in length, not strongly 
transverse ; club oblong-obovate, with two curved sutures. Bases of the prothorax and elytra evidently 
margined. Anterior coxe separated by a strongly transverse prosternal process ; tibiew broadly dilated 
at apex, the superior margin serrate with strong teeth; anterior pair with the last two teeth prominent 
and separated by a rather deep recess, middle and posterior pairs rounded at apex. Tarsi rather long 
and slender, received into grooves on the inner face of the tibiz. 
Two species from Central America are referred to this genus, which is sufficiently 
distinct in the structure of the legs. I have seen a third from Brazil. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 6, December 1897. 29AA 
