Mr. E. E. Austen on Cutiterebra. 147 
XIX.—Further Notesgon Cutiterebra: On the Identity of 
certain Species described by the late Bracy Clark. By 
E. E. Austen, Zoological Department, British Museum. 
Cutiterebra atrox, Clark. 
In the May number of this Magazine (Ann. & Mag. Nat. 
Hist. ser. 6, vol. xv. p. 378) I suggested that a species of 
Cutiterebra from Trinidad, which I there described as C. fune- 
bris, sp. n., might after all prove to be identical with C. atroz, 
Clk., from Mexico. At that time I had seen neither Clark’s 
type. nor his original description, and consequently was 
unable to express a final opinion upon the question. By the 
courtesy of Prof. Poulton, however, I have recently received 
for examination from the Oxford University Museum the type 
of C. atrox, as well as that, of C. detrudator, Clk., besides a 
copy of Clark’s “ Addenda 1848,” in which these two species 
are described. A glance at the type of C. atrow, Clk., was 
sufficient to show that this species is altogether distinct from 
my C. funebris, while a moment’s further study proved that 
C. atrox, Clk., is identical with C. terrisona, Walk. Of the 
five triangular spots of yellow pollen which I described (oc. 
cit. p. 382) as resting on the inner margin of each eye in the 
type of the latter species, the two lowermost are alone present 
in the case of Clark’s type, while the upper of the two, corre- 
sponding to the longest in the case of C. terrisona, is here 
reduced to asmall triangular point, and the lower one, resting 
on the inferior angle of the eye, is also diminished in size. 
Another minor difference is that the oval spot of yellow 
pollen surrounding the extremity of the vertical fissura fron- 
talis on each side in C. terrisona is wanting in the type of 
C. atroxw. The type of the latter, however, is apparently a 
male, while that of terrisona is a female; so that if the 
smaller number of pollinose spots on the face and cheeks of 
C. atrox is not due to denudation, the differences in question 
are in all probability sexual, just as we find that in the case 
of C. americana, F., the jagged yellow pollinose border 
present on the cheeks in the female is absent in the male. 
Clark’s type is in an excellent state of preservation and much 
cleaner than Walker’s specimen ; so that the narrow yellowish 
pollinose margins to the abdominal segments, which I men- 
tioned in my notes on the type of terrisona, are here much 
more conspicuous. On the fifth segment the irregular 
pollinose markings have collected to form a jagged transverse 
band on the front margin. On the pleure, in front of and 
10* 
