1 1886.) . Entomology. 731 
The illustrations are for the most part very good, while the 
7 chromo-lithographs, from sketches by Mr. F. D. Owen, are most 
; excellent. The report will be most serviceable to orange-grow- 
ers, and also contains many new observations of special interest 
to entomologists. 
STRIDULATING AND SENSE-ORGANS IN DIPLOPOD MYRIOPODA.— 
r. G. C. Bourne describes several points in the anatomy of 
Sphzrotherium, which have been overlooked by previous writers. 
The genus differs from Glomeris in the position of the antennz 
in a deep fossa. Corresponding to each of the twenty-one pairs 
of legs is a pair of “tracheal plates” placed between the attach- 
ments of the appendages. The first three pairs belong to as 
many segments, while of the remainder, like the legs, two pairs 
belong to each segment; there is also a nerve-ganglion to each 
Segment. In the male there are three extra pairs of appendages, l 
copulatory in function; two pairs of these bear stridulating 
organs which have not been previously noticed in this genus; 
besides the chitinous ridges on these appendages, there are similar 
ridges on the inner surface of the large terminal tergite. 
_ The tracheal system differs from that of most other Diplopods 
in having very well developed branching trachee. Each tracheal 
plate carries a stigma, which opens into a “tracheal sac.’ rom 
this Sac two main tracheal trunks pass out, each of which breaks 
up into a number of smaller branches. The author considers the 
tracheal sacs homologous with those of Peripatus, from which 
form these branching trachez are derived. 
The antennary sense-organs are conspicuous. An error is 
pointed out in the description of their histology by Bütschli, who | 
mistook certain cells, in the connective tissue surrounding the 
nerve bundles, for ganglion-cells. An auditory organ is presup- 
Po the existence of a stridulating organ. The cavity open- 
ing to the exterior by a small pore below the eyes is regarded as 
such an organ; it is lined by a sensory epithelium, supplied by 
the nerve-fibers from the cerebral ganglion.— Fourn. Roy. Micr. 
Soc., April, 1886, : 
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