a new subfamily of Scolytide. 439 
arge, deep, reniform. Prothoracic pore in female conspicuously 
filled with a tuft of yellow material. 
This species, one of the most remarkable among the 
Scolytide, presents notable features in the development 
of the male antenne and prothorax. The former have 
been described ; the first joint of the funiculus is appa- 
rently elongated in its long axis, but comparison of it 
with the antenne of S. daimio and tycon shows that it is 
prolonged outwardly, carrying the rest of the funiculus 
with it. When the antenne are fully extended, the 
scape points directly forwards, and the funiculus is 
curved outwards ; when they are flexed, the funiculus is 
flexed outwards on the scape, inwards on the club, 
curving round its convex base so that, if the scape 
remains fixed, it and the club will point forwards, the 
funiculus backwards; a movement of the scape will then 
bring the antenna under the head, in the hollow of 
which it lies. The prothoracic fovee in the males of 
these insects are correlated in size with the antenne, 
but I have not been able to discover how they are used. 
In addition to the ridge which forms the lower 
boundary of these fovee, and separates the ventral 
surface of the prothorax from the flanks, the anterior 
edge of the prothorax is flexed upwards in the male of 
this species, forming a narrow border, which is bounded 
by a well-marked ridge passing in front of the anterior 
cox and prosternal process; this flexion is probably to 
increase the cavity for the antenne formed by the recessed 
outer surface. The ridge bears two prominent tubercles 
at the front of the prosternum, which is narrowed, and 
before them on the flexed margin are two minute in- 
wardly curved chitinous hooks, conspicuous because 
nearly colourless. These hooks are close together, and 
not apart, like the processes in S. daimio. Between 
these structures the recess is deep, and contains a 
circular hole, visible from in front, and only separated 
by a thin transparent membrane from the cavity of the 
prothorax. I can form no reasonable conjecture as to 
the use of this extraordinary arrangement, which is not 
present in the females, but exists in a modified form in 
the males of S. daimio and siomio; the dorsal pore of 
the females is equally unintelligible. 
