On a new Genus and Species of Odonata. 229 
eall of the cheetah is a most decided mew, hardly distin- 
guishable from that of domestic cats. 
Apart from the roar there is another very distinctive 
feature about the voice of the cats witha normal hyoid. This 
is the familiar “ purr.”’ Lions, tigers, leopards, and jaguars 
never purr; on the other hand, such widely different species 
as cheetahs, pumas, caracals, jaguarondis, and others that 
could be named, always, when sufficiently tamed, express 
pleasure or content by that sound. These are interesting 
differences correlated with the differences in the hy oidean 
apparatus above described. 
CONCLUSION. 
The following are the main points this paper seeks to 
establish :-— 
1. The hyoid of the jaguar (Felis onca) resembles that of 
the lion (#. leo), tiger (2. tigris), and leopard 
(F. par was) in having “the suspensorium lengthened 
by an elastic ligament interposed between the 
ceratohyal and the upper elements of the suspen- 
-sorium., Blainville, therefore, was wrong in 
denying the existence of the ligament in the 
jaguar. 
2. The hyoid in the ounce (/. uncia) resembles that of 
the above-mentioned species. 
3. The species in which the hyoid is provided with this 
ligament roar, but do not purr. All the other 
species of Felidee with normally constructed hyoid 
purr, but never roar. 
XXIU1.—Trizschna gossi, a new Genus and Species of 
Odonata from the Locene of Bournemouth. By Herserr 
CAMPION. 
[Plate XI] 
In the ‘Entomologist’? for 1878 (vol. xi. p. 193) H. Goss 
figured the right fore-wi ing of a fossil Adschnid dragonfly, 
and made some general fees concerning it. The speci- 
men was in a very fine state of preservation, and was 
obtained by J. Starkie Gardner from the leat-beds (Bagshot 
Sands) of Bournemouth, Hampshire. It was referred to 
the genus Avschna, but no specific name was. proposed, no 
measurements of the wing were stated, and no description of 
the venation was given. 
