434 Mr. J.S. Baly oa new Genera and Species of Phytophaga. 
more prominent, and causing the base of the elytra to appear 
more abruptly truncate; they are shorter in proportion to their 
basal breadth, and at the same time more quickly narrowed 
from base to apex, thus being less parallel and more regularly 
wedge-shaped; they are less deeply depressed transversely be- 
low the basilar space, their surface 1s more finely punctured and 
opake ; the hinder thighs are shorter, thicker, and less attenuated 
towards their apex ; viewed laterally, they are suddenly thickened 
at their base, and then gradually increase in width to beyond 
their middle. In S. speciosa they increase more gradually at 
first, but remain for some distance in the middle at nearly 
the same width ; viewed from above, the outer edge in S. muta- 
bilis is more regularly curved, the thickest portion of the femur 
being about or just beyond the middle ; in S. speciosa, on the 
other hand, the thigh is more attenuated from its middle to its 
apex, the thickest part being rather before than at the middle 
itself. In the female the elytra are oblong-ovate, and not nar- 
rowed from base to apex as in the male; but I do not know any 
characters by which the ? can be separated with certainty from 
the same sex of S. speciosa, S. Druryi, and other allied species. 
Sagra Livingstonit. 
S. elongata, obscure czeruleo-nigra, supra subopaca, subtus nitida ; 
thorace latitudine vix longiore, angulis anticis paullo prominulis, 
disco leevi, basi unifoveolato; elytris intra humeros leviter im- 
pressis, tenuiter sulcato-striatis, sulcis distincte punctatis, ante 
apicem deletis, sulcis 5°° 6", 7"° 8*°, et 9"° 10™° pone medium non- 
nihil per paria approximatis; tibiis intermediis subtus ultra me- 
dium dente obtuso armatis. 2 
Long. 8 lin. 
Hab. Zambesi River. 
This species is nearly allied to S. Urania and S. seraphica ; 
the very obtuse tooth or spine on the under surface of its inter- 
mediate tibize will without trouble serve to distinguish it from 
both those insects: by means of the above-mentioned characters 
it enters into that section of the genus which contains S. ¢ristis 
and S. Murrayi; but the punctation of the elytra and the non- 
prolongation backwards of the prosternum show without doubt 
that it belongs to quite another section. 
Head finely punctured ; antenne rather longer than half the 
body, robust, slightly increasing in thickness towards their apex, 
third and fourth joints ovate, nearly equal. lytra subparallel, 
slightly narrowed towards the apex, the latter narrowly obtuse ; 
above moderately convex, very slightly flattened along the suture, 
not depressed below the basilar space; each elytron with ten 
sulcate strie, the first short ; these strie, which are nearly equi- 
