MR. CURTIS ON A NEW SPECIES OF SAW-FLY. 41 
wings are entirely black, with the costa and stigma thickened and darker, as well as the 
nervures, the surface being iridescent; the superior (fig. 8) have two marginal and four 
submarginal cells; the first minute, the second twice as large, the other two very large, 
the third receiving the transverse nervures which divide the marginal and discoidal cells; 
the inferior have only one discoidal cell (fig. 8*): the legs are moderately stout and 
pubescent; the tibiæ are spurred at the apex, the spur of the anterior pair notched af the 
apex ; tarsi 5-jointed, the first four lobed beneath; the last joint terminated by two bifid 
. testaceous claws and simple pulvilli (fig. 9). 
Although the elongated antennæ of this Selandria resemble those of Nematus, and still 
more those of Cladius, this species is not only distinguished from those genera by the 
divided marginal cell, but the heavy habit of the females especially shows at once the 
groups to which it is naturally allied, and these affinities are supported by its trophi, which 
are intermediate between Athaliat+ and Tenthredot. I may observe that the number of 
discoidal cells in the inferior wings varies in the species of Selandria, a character hitherto 
unnoticed, but which may supply admirable distinctions for reducing the genus into sec- 
tions. 1st, Those with two discoidal cells, the marginal cell receiving one transverse 
nervure, of which S. serva, Fab., is an example (fig. 13). 2ndly, S. stramineipes, Klug, 
in which both transverse nervures are united with the marginal one (fig. 14). 3rdly, Those 
with one discoidal cell, as shown in S. Robinsoni (fig. 8*) ; and 4thly, Those having no 
discoidal cell, as in S. fuliginosa, Schr. (fig. 15). The variations in the position of the 
nervures and the magnitude of the cells will also be found very useful in identifying the 
species ; and although occasionally the nervures are not symmetrical, and occasionally the 
recurrent ones are wanting, such exceptions will not invalidate the divisions I have traced, 
but will, I trust, lead to a more careful investigation of this fine and interesting family. 
EXPLANATION OF THE PLATE. 
Tas. V. 
[Obs. Those figures with a * attached are magnified. } 
Fig. 1. A portion of the stem of Convallaria multiflora, as eaten by the larvæ of Selandria Robinsoni. 
Fig. 2,2. The larvæ feeding in two different skins. 
Fig. 3. One of the skins cast off and sticking to a leaf. 
Fig. 4. The cocoon, with the end opened by the fly when it hatched. 
Fig. 5*. Head of the male viewed above, 
Fig. 6*. The trophi or mouth. 
Fig. a*. The labrum or upper lip. 
Fig. b, b*. The two mandibles or jaws. 
Fig. c, c*. The two maville. 
+ Curtis’s Brit. Ent. fol. & pl. 617. - + Ibid. fol. & pl. 692. 
VOL. XXI. 
