various Central American Coleoptera. ql 
Cybocephalus from that region, whence three are now 
described. Jacquelin Duval, it may be noted, correctly 
described the antennal club as 3-, and the tarsi as 4-jointed ; 
but in his figure the club is given 4, and the tarsi 5 joints. 
Acribis, Waterh., type A. serrativentris, from the Galapagos 
Is., is not separable from Cybocephalus. 
*Cybocephalus aciculatus, n. sp. (Plate III. figs. 3, portion 
of antenna; 3a, anterior tibia and tarsus.) 
Oblong-ovate, transversely convex, black, the margins of the 
thorax testaceous in one example, the antennae and _ legs 
piceous; glabrous above, the pygidium and under surface clothed 
with long cinereous hairs, the legs setulose. Head and thorax 
shining, almost smooth; antennae with the 3-jointed club (fig. 3) 
very stout, oval, about as long as the preceding five joints united. 
Elytra alutaceous and somewhat closely aciculate (the minute 
punctures, when viewed under the microscope, in the form of short 
needle-scratches); the apices broadly subtruncate, leaving the 
pygidium exposed. Under surface alutaceous and closely, minutely 
punctate, the hairs long and adpressed; metasternal process very 
broad, arcuate, margined in front. Tibiae moderately broad, 
the anterior pair (fig. 3a) hollowed externally at the apex, and 
with the outer apical angle sharp. Tarsi slender, the third joint 
narrow, excavate above for the reception of the fourth. 
Length about 1 mm. 
Hab. Mexico, near the city (Flohr). 
Two specimens. The chief characters of this insect 
are—the alutaceous, aciculate elytra, the excavate apex 
of the anterior tibiae, the slender tarsi, and the broadly 
rounded, margined metasternal process. The row of 
closely placed punctures along the apical margin of each 
of the ventral segments 2-4 gives an appearance of 
serrulation, hence the name serrativentris for one of the 
species of this genus. 
*Cybocephalus flavicornis, n.sp. (Plate ITI, figs. 4, portion 
of antenna; 4a, anterior tibia and tarsus.) 
Subrotundate, very convex, shining, glabrous above, black, the 
antennae and the margins of the thorax testaceous, the legs fusco- 
testaceous ; the thorax and elytra with widely scattered excessively 
minute punctures, which become more distinct on the apical declivity, 
the interspaces polished. Antennae (fig. 4) with the oval 3-jointed club 
