157 Mr. F. Smith on new Genera and 
so exceedingly close a resemblance that no decided specific di- 
stinction has yet been satisfactorily pomted out, however probable 
it may be that such distinction may exist. 
Why, therefore, the one should be popularly styled a “ wild 
Horse,” and the other a “ wild Ass,” it is difficult to comprehend. 
Even Pallas terms the Dshiggetai “un Cheval sauvage,” though 
describing it as “ni Cheval ni Ane;” while the other he both 
designates as the Ass of the steppes and as the “ Cheval ou Ane,” 
employing the word “ cheval ” in its German equivalent evidently 
in the sense of eguus. Col. Chesney, as we have seen, terms the 
Arabian A. hemippus a “ wild Horse,” as distinguished from his 
wild Ass of South Arabia! The fact is, I apprehend, that the 
vague application of these names has resulted merely from the 
eolouring. 
XXXII.—Deseriptions of new Genera and Species of Tenthredi- 
nide in the Collection of the British Museum. By Freprrick 
SMITH. 
Tux collection of Tenthredinide contained im the national 
Museum is perhaps the most extensive in Europe; the species 
described in the present paper are, in my own opinion, the most 
remarkable in the various genera to which they belong. The 
Hylotoma imperialis is unrivalled both in size and beauty by any 
of the species of that extensive genus. The new Lyda is the 
first species which J have seen from the East, and is remarkable 
for the extreme elongation of the antenne. The new genus 
Derecyrta is, however, the finest addition to the family. The 
new species of Sirea must acquire additional interest from the 
fact of its being discovered in the cedars of Lebanon. Having 
been engaged in the preparation of a Catalogue of the Tenthre- 
dinide for some time past, and it being obvious that its com- 
pletion will occupy still a considerable length of time, I have 
thought it desirable to secure to myself the description of a few 
of the more remarkable species and genera of this family of 
insects. 
Genus Hytoroma, Latr. 
Hylotoma imperialis. 
H. nitens, supra purpureo-violacea; capite, thorace abdomineque infra 
nigro-chalyheis ; alis flavo-hyalinis ; antennis nigris, opacis. 
Female. Length 8 lines. Brilliant purple, with violet tints 
above, varying in different lights ; beneath of a steel blue, very 
smooth and shining; the antenne of an opake black ; the wings 
yellow hyaline, the nervures reddish-yellow. 
Hab. North China. Robert Fortune Esq. 
