PROBLECHILUS. 173 
Smaller than either of the two preceding species, less broadly ovate than P. reitteri; covered with moderately 
dense, short, cinereous-yellow, decumbent pubescence. Head black, the front (? d ) flattened, subnitid, 
with a shining subcarinate side-margin in front of the upper part of the eye and the antennal pit; front 
(292) slightly convex, dull, and granulate, with the side-margin indistinct ; labrum rufescent ; antenna 
light testaceous, with the club infuscate. Prothorax transverse, suborbicular, as in P. consocius ; its disc 
with the postmedian elevation indistinct, fuseous-black, with the apex and a basal fascia testaceous, or 
entirely testaceous with an ill-defined darker shade, granules over the anterior half sparser and less 
evidently arranged in lines. Elytra at base almost wider than the prothorax, and more than one-half 
longer, with the sides subparallel to the middle, thence rounded to the apex, scarcely as obliquely as in 
P. consocius ; their surface usually testaceous, with the side and sometimes the sutural margins infuscate, 
more rarely entirely fuscous-black, with very shallow striw, deeper posteriorly, the sutural stria more 
impressed throughout, their punctures more evident than in the allied species, the interstices slightly 
shining, nearly flat at base, convex towards the apex, the first and succeeding alternate interstices with 
a single scattered series of sete, shorter and finer than in P. reitteri. Flanks of the prothorax and under- 
side fuscous-black ; the abdomen rufescent; legs pale testaceous. 
Hab, GuateMa.a, near the city, San Gerénimo (Champion). 
I have seen sixteen specimens. It is hardly possible to give precise differential 
characters to separate this species from P. reittert?. It is smaller and narrower, with 
the elytra nearly parallel-sided to the middle, usually lighter in colour, and less opaque, 
with the punctures of the strize evident and the sete finer. 
Group HEXACOLIDES. 
Head at most with very slight indication of a rostrum, not deeply sunk in the prothorax, sometimes with the 
vertex visible from above; eyes entire, oblong or oblong-oval. Antennal funiculus 6-jointed, the club 
small or moderate in size, flattened, triarticulate, with transverse or slightly curved sutures, their margins 
not fringed (in Microborus the club is obliquely compressed and subtunicate). Prothorax not, or not 
strongly, declivous in front, usually uniformly and gently convex from base to apex, with a well-defined 
side-margin and usually a basal margin; its dorsum smooth and simply punctured, or very feebly asperate 
towards the apex. Elytra not elevated or granulate at the base, but sometimes with a well-defined basal 
margin, their apical extremity smooth, declivous, and convex, without impressions or armature. Fore 
and middle coxe more or less widely separated; the mesosternum rather prominent, with a free edge , 
third and fourth abdominal segments each little shorter than the second, the anal opening terminal. 
Superior border of the tibiz serrate, straight in the anterior pair, which are subtruncate, with one or two 
strong teeth before the apex, curved in the remaining pairs. Tarsi simple, the first joint as short as or 
shorter than the second. . 
The characters given above, though not at first sight specially striking, are never- 
theless such as to make it difficult to include with propriety the species exhibiting 
them either in the Hylesinides or the Tomicides, and sufficiently indicate the limits of 
what appears to be a logical and natural assemblage. ‘The existence of six joints 
in the antennal funiculus is, in the Tomicides, an extremely rare occurrence, and 
together with the laterally-margined and feebly declivous prothorax will readily 
distinguish the components of the present group, many of which have a marked 
likeness to species of Cioide. In Epomadius alone the lateral margin of the pro- 
thorax is indistinct, its place being taken by a singular structure which I have not 
met with elsewhere in Scolytide. The extent to which the head is concealed by the 
