454 SUPPLEMENT. 
finely punctured, the punctures on the elytra scarcely coarser than those on the prothorax. Head with 
a deep frontal suture, the eyes small; antennsw moderately elongate, very slender ; prothorax transverse, 
much broader at the base than at the apex, with the sides rounded anteriorly and sinuate behind, the 
hind angles acute and directed outwards ; legs very slender, the first joint of the hind tarsi much longer 
than the other joints united. 
Length 23 millim. (¢.) 
Hab. Mexico, Zacualtipan in Hidalgo (fége). 
One specimen. Closely allied to UM. figuratus, but differing from the three examples 
of that insect before me in having the anterior fascia of the elytra more interrupted— 
formed by four partly confluent longitudinal streaks on each elytron, and nearly 
enclosing three oblong spots; it also has the eyes smaller, and the antenne shorter 
and more slender. 
1 (zs). Microtonus trifasciatus. (Tab. XXI. fig. 2.) 
Moderately elongate, rather convex, opaque; the head ferruginous; the prothorax pitchy-brown or fusco- 
ferruginous, with the sides broadly and indeterminately paler; the elytra each with a broad oblique 
fascia below the base and two narrower, interrupted, partly confluent oblique fascie beyond the middle 
testaceous, these markings not reaching the suture or lateral margin, for the rest piceous or black; the 
antenne, oral organs, and legs, the femora and apices of the tibiw excepted, testaceous; the under 
surface piceous; the entire upper surface exceedingly densely punctured, the punctures on the elytra 
much deeper and coarser than those on the prothorax; the head and prothorax and the light-coloured 
portions of the elytra rather thickly clothed with yellowish-cinereous pubescence, the pubescence on the 
dark portions of the elytra indistinct, that on the prothorax variegate. Head with a well-defined frontal 
suture, the eyes rather small; antenne very slender, moderately elongate ; prothorax transverse, much 
broader at the base than at the apex, with the sides rounded anteriorly and sinuate behind, the hind 
angles acute and directed outwards ; legs very slender, the first joint of the hind tarsi much longer than 
the other joints united. 
Length 27-37 millim. (¢ 2.) 
Hab. Mrxico, Real del Monte 9300 feet (Flohr). | 
Six examples. Narrower than I. figuratus; the elytra very differently marked and 
much more closely punctured, the eyes smaller, the antenne shorter and more slender, 
the tibie testaceous towards the base. 
SISENES (p. 130). 
-Sisenes foveatus (p. 138). 
To the Mexican locality given, add :—Almolonga (Flohr). 
OXACIS (p. 149). 
12 (a). Oxacis constricticollis. (Tab. XXI. fig. 1.) 
Elongate, rather narrow, finely pubescent, luteous-yellow, the eyes and the tips of the mandibles black; the 
maxillary palpi piceous, with the tip of each joint testaceous ; the antenne black at the base, becoming 
brownish towards the tip, the extreme base of each of the joints 6-10 testaceous; the labial palpi and 
under surface flavo-testaceous ; the coxe and femora, the tips of the latter excepted, pallid testaceous, 
