1S80.J 
3 
The scales, which I have been able to compare with those of M. 
maritima only, differ from them in their smaller size, and in the greater 
number of ridges, which vary from fourteen to sixteen in this species, 
whereas in maritima they are generally not more than twelve in 
number ; in M. polypoda (Beck, in Lubbock’s Thysanura and Collem- 
bola, Ray Society publication) the ridges vary from eighteen to twenty- 
four. Another distinction may be noticed in the pedicel, which, in 
this species and M. polypoda, projects beyond the base of the scale, but 
does not do so in maritima . The general arrangement of the ribs and 
cross-bars is the same in all ; but 1 observe in the species now under 
consideration that in the rounded or ovate scales, which I conclude are 
the younger forms, the ribs converge to the centre from both sides, 
so as to form a succession of Vs, with the apex pointing away from 
the pedicel : this I can find no trace of in the scales of M. maritima. 
The insect lives under stones in dry places, and always appears 
rather sluggish, indeed, when the sun was not shining, it did not leap 
at all, but slowly crept away when disturbed. It appears to be very 
local, as I only found it in a very circumscribed area, although 
there were many likely places for it close by. It is by no means easy to 
find, owing to its colour, and the way it adheres closely to the stone 
when it is lifted. 
I propose for this species the name of Machilis brevicornis, in 
allusion to the shortness of its antennae, which are shorter than those 
of any Machilis with which I am acquainted, except M. crassicornis 
(Lucas), which occurs in Algeria. 
I ought to call attention to the fact that in some features Temple- 
ton’s figure of M. polypoda (Trans. Ent. Soc., vol. i, plate xi) bears a 
considerable resemblance to this species, but as his figure is so roughly 
drawn, and as he gives no details nor colour with it, it is impossible to 
say whether or not he had this species before him. 
I should also have mentioned that the insect became of a yellowish- 
white colour in spirits. 
20, Portsea Place, Connaught Square : 
May, 1880. 
NOTES ON CRABRO RLONGA TULUS, V. DER LIND., AND THE OTHER 
BRITISH SPECIES OF CRABRO WITH BLACK BODIES. 
BY EDWARD SAUNDERS, E.L.S. 
Of all our British species of Crabro, elongatulus seems to have 
been the cause of the greatest confusion ; Shuckard* describes it 
under seven different names, F. Smith under five. On the continent 
* Essay on the Indigenous Fossorial Hymenoptera, 1837. 
