236 ON AN ICHNEUMONID LARVA 
terior margin of each anterior wing, a little beyond 
the middle towards the extremity. The legs and the 
maxillary and labial palpi were of a yellowish-brown 
colour, the tarsi and the extremities of the tibiee of 
the posterior legs excepted, which had a brown hue. 
The abdomen consisted of eight segments: the first, 
which was the longest, was rather narrow and of a 
brownish-black colour; the others had a dark brown 
hue above, but the posterior margins of the second, 
third, fourth, and fifth were much the darkest. The 
caudal or terminal segment was the shortest, and had 
a small hairy process on each side at the extremity. 
All the segments, except the first, were of a pale 
brown colour on the underside of the abdomen. The 
ovipositor was hairy, of a very dark brown hue, and 
measured 34; of an inch in length. 
On the 20th of July, 1838, I obtained a young 
female Hpeira antriada, to whose abdomen a full- 
grown larva of this insect was attached, and placed it 
in a phial. On the 23rd the larva became restless 
and destroyed the spider, after having reduced it to a 
mere corrugated skin; then quitting it, and taking 
its station on the extremity of the cork which stopped 
the phial, it commenced spinning its cocoon, and 
completed it on the 24th. Out of this cocoon, which 
exactly resembled the one described above in figure 
and colour, though it was somewhat less, a male Poly- 
sphincta carbonaria issued on the 16th of August. 
This insect was without an ovipositor, and was 
