176 Mr. C. J. Gahan’s notes on the 
Sisyrium stigmosum, Pase. 
Journ. Linn. Soc., vol. ix., p. 95, pl. 3, fig. 3. 
Mr. Blackburn has evidently been mistaken with 
regard to this species. I have before me a male ex- 
ample which answers so well to Pascoe’s description and 
figure, that I have not the least doubt as to its identity. 
The length of the prothorax is about (perhaps not quite) 
one-half greater than the greatest width. The male 
presents the additional character (not mentioned by 
Pascoe) of having a rounded tomentose depression on 
each side of both the third and fourth segments of the 
abdomen. . 
With one exception—and in this Mr. Blackburn is not 
likely to have erred—the description of S. ventrale, 
Blackb., closely applies to the present species. The 
exception is that the prothorax in ventrale is scarcely 
longer than broad. 
I am, however, inclined to think that S. sparsum, 
Blackb., which strongly resembles S. ventrale, but in 
which the prothorax is one-third longer than broad, is 
identical with S. stigmoswm, Pasc. The Sisyrium vittatum 
of Blackburn is, without doubt, as he himself suspected, 
a very distinct species, and need no longer be queried as 
a variety of stigmoswm. 
Sisyrium ibidionides, Pasc. 
Obrium ibidionides, Pasc., Trans. Ent. Soc. Lond., 
ser. 2, vol. v., p. 26; Trans. Ent. Soc. Lond., 
ser. 3, vol. 1., p. 559. 
Igenia ibidionides, Pase., Journ. Linn. Soc., vol. ix., 
p- 90. 
In the first work cited Pascoe omitted an important 
character of this species which he supplies in the second, 
and which has some bearing upon the validity of his 
genus Igenia, of which it was subsequently taken as the 
type. The male (female according to Pasc.) has a 
median tomentose depression upon each of the first four 
abdominal segments. The first depression is rather 
small, the others are broad and transverse. 
The prothorax in this species is much longer than 
broad. 
