202 Dr. David Sharp on 
Although these structures do not exist in the Campo- 
notides, it will be convenient to give a description of the 
condition of the corresponding spots in this group. 
Before passing to the descriptions, I should like to 
express my thanks to Mr. Salvin for supplying me with 
some specimens from Guatemala; to Mr. Champion for 
others collected by Mr. J. J. Walker in Australia and 
Tasmania ; and to Prof. Forel, of Zurich, for supplying 
me with the names of some of the species alluded to. 
CAMPONOTIDES.—Camponotus cruentatus (worker major). 
Pyrenees. The sculpture on the retracted and covered 
parts of the segment is quite free from sete, and becomes 
coarser and more distant as the base is approached ; it 
is, in fact, similar in nature to the sculpture in the 
Ponerides, with the exception of the absence of the 
stridulating band, and with this great difference, that 
the sculpture of the exposed portion passes gradually 
into that of the covered portion, whereas in Ponerides 
there is an abrupt line of demarcation between the two. 
CaMPONOTIDES.—Lasius flavus (worker). A very short 
space or ring extending all along the base of the segment 
is covered with rather coarse irregular lines. The line of 
demarcation between this and the general surface of the 
dorsal plate is abrupt, and there is an extreme difference 
of texture between the space uncovered and that covered 
by the overlapping part of the preceding segment. 
L. fuliginosus (worker). Hngland. As in Campo- 
notus and L. flavus, there is no stridulating organ; the 
ring of sculpture at the base of the segment is finer than 
it isin L. flavus, and the line of demarcation between 
the general sculpture and that of the basal ring is not 
so abrupt. 
PonERIDES.—Dinoponera grandis (worker). Amazons 
The retractile portion of the third segment is covered 
with a beautiful sculpture of transverse slightly irregular 
and broken up lines, very densely packed ; in the middle 
of the dorsum there is a narrow band of finer, longer, 
and perfectly parallel lines. The edges of this band are 
extremely irregular in outline ; this arises from the fact 
that the stridulating lines have a reflecting power diffe- 
rent to that of the contiguous sculpture, and these two 
textures pass into one another irregularly. In some 
places the lateral lines are prolonged into the stridulating 
