The Rev. Ww. Kırzy on a new Order of Insects. 117 
Truncus. Thorax postice in medio obtusangulus. Scutel- 
lum longitudinaliter et late canaliculatum. Postlumbium 
pallidum. Ale cinereo-albidze : margine crassiori, nervis- 
que nigris. Pedes cinerei vel potiüs luridi: tarsis nigri- 
cantibus. | á 
ABDOMEN reliquo corpore magis obscurum: ano pallide 
rufescenti. 
Rossi, in his description, which, extraordinary as he deemed 
his insect, appears to have been drawn up from a very cursory 
and inaccurate survey of it, mistakes the mandibulz for sete, 
and seems not to have traced them to their point of insertion 
under the head, since he merely says * Labium breve, medio seti- 
 gerum." He takes no notice either of the eyes being placed on a 
footstalk or pillar, or of the remarkable processes which defend 
the base of the abdomen on each side; nor do they appear in his 
figure: yet I cannot suppose that his insect wants these singular 
characters. The elytra he regards as an appendage of the thorax 
something similar to the Halteres of the Diptera. 
Upon comparing the above descriptions of X. Rossii and 
X. Peckii together, we find that they not only differ in colour, 
but also in the length of the first joint of the palpi compared 
with the second, and in the shape of the branches of the antenne. 
Rossi also makes no mention of the minute white dots which 
render those of X. Peckii so remarkable : therefore I feel little or 
no hesitation when I give them as distinct species. 
The branches of the antennz of Professor Peck's species, from 
their inner surface being plane, under certain circumstances are 
probably applied to each other, so as to form a single columnar 
branch gradually decreasing in diameter. What may be the use 
of these extraordinary organs ? In the present instance, from their 
being emt PD the white dots with which they are so 
thickly 
