NATURAL HISTORY MISCELLANY. 691 
(Say); a genus of flies allied closely to Leptis. The female Bete s 
are rounded, somewhat spatulate, and of the usual form s n other 
species of the genus. The appendage is covered with stiff Violin hairs, 
about fifty in number, arising from conspicuous, round, clear cells, while 
the whole surface, as seen under a Zentmayer's 4-10 (A eye-piece), is 
densely covered with minute short hairs. On the posterior edge of the 
upper side of each appendage is situated a single, large doin sac, with 
the edge quite regular. Its diameter is equal to a third of the iir of 
the appendage on which it is situated. Dense fine hairs, ul those cov- 
ering the appendage, project inwards from its edge. The bottom t this 
shallow pit is a clear transparent membrane not bearing "n in There 
are no special sense-organs on the antenne of the same in 
With these organs, which I suppose to be pou in diae func- 
tion, may be compared a very similar single sac situated on the under 
side of the end of the labial and maxillary palpi of a species of Perla, 
mounted on a slide in the same collection. Its diameter is nearly half as 
great as the palpal joint itself. Instead of being depressed, the sac in 
Perla is a little raised, forming a slightly marked, flat tubercle, which is 
ace the mem 
ne (tympanule of Lespés) is naked. It is strongly probable that this 
P an olfactory organ, and placed on the under side of the palpi, next to 
the mouth, so as to enable the insect to select its proper food by its odor, 
giving an additional sensory function to the palpi of insects. There are 
no special sense-organs in the antenne. 
Lespés in his note on the auditory sacs, which he says are found in 
the antenne of nearly all insects, states that as we have in insects com- 
pound eyes, so we have compound ears. I might add that in the abdom- 
inal appendages of the cockroach we apparently have a compound nose. 
{n the palpi of Perla, and the abdominal appendages of Chrysopila the 
** nose" is simpl 
On examination, I have found sense-organs in both pairs of antenna 
of Homarus xvii the Lobster, such as are described by Farre, and 
also the more rudimentary form of supposed auditory organs in the com- 
mon spiny Lobster (Pilinurss) of Key West, Florida. — À. S. P., Nov. 30. 
NOTE ON THE EXISTENCE OF TRANSVERSELY USCULAR 
FIBRES IN Acmxza.— While engaged in the p ESD pr: "a lingual 
ribbon of a species of Acmæa (A. (Collisella) Bickmorii D.), brought 
from Amboyna by Mr. Bickmore, I noticed that, among the fibres adher- 
marked, though exceedingly fine, transverse stris j ctüre of the 
fibre itself was mpl sparent tube or cylinder with nuclei irregu- 
tractores radule, or the principal, if not the only agents in pulling back 
