CONTRIBUTIONS TO OUR KNOWLEDGE OF BRITISH BRACONIDE. 2831 
spurs of the hind tibie are longer and stouter; from immunis 
and jugosus it is easily separated by its rugulose metathorax. 
The cocoon is smooth and of a pale lemon colour. This 
species passes eleven months within its cocoon, the larva 
leaving its host in June and not producing an imago until the 
following May. 
A solitary parasite which I have several times bred from 
small larve of Hemaris fuciformis. 
Care must be taken not to confuse this species with rubecula, 
which is also bred as a solitary parasite from small larve of 
H. fuciformis, and makes very similar cocoons. A. rubecula has 
dusky wings and wants the impressed lines on the second 
abdominal segment. 
Spurius, Wesm.* 
A species with slender legs, by which it may be distinguished 
from zygenarum, careé, difficilrs, ete. 
The cocoons, which are thin, papyraceous, and arranged in a 
cake with great regularity, are enveloped in a fluffy ball very 
similar to that made by the larve of congestus, but firmer and 
lighter in colour (fig. 5). The insect differs from congestus in 
that the hind coxe and first and second abdominal segments 
are much smoother, also the terebra is subexserted and the first 
abdominal segment narrower. 
On May 27th, 1911, I obtained a brood of 38 (5 males and 
33 females) from a larva of Leucania littoralis, taken at Sand- 
banks, Poole, and Mr. F. M. Mitchell Hedges has sent me several 
other broods all from ths same host, taken on the Dorset coast. 
I have seen specimens taken by Cameron in Scotland, and now 
in Harwood’s collection. 
Zygenarum, Marsh.+ 
Nearly related to insidens and diffcilis, but differing from the 
former in that the wings are somewhat paler, and from the 
latter in that the first two segments of the abdomen are not so 
shining, and from both in having the metathorax carinulated. 
Marshall says that all the tarsi are rufo-testaceous, but in many 
cases I have found the tarsi to be distinctly fuscous. Cocoons 
sulphur-yellow, generally attached toa grass stem in an irregular 
cluster some inches above the ground (fig. 3). The larve of 
the parasite emerge from their host when the latter is nearly 
full fed. Ihave two broods given me by Colthrup, who obtained 
them from larve of Zygena /filipendule taken at Shoreham, and 
haye myself bred numbers in mid-July from the same host taken 
at Beer, Devon, and also on the railway embankment near 
Holmsley Station, New Forest, where, until recently, there was 
* *Nouv. Mem. Ac. Brux.,’ 1837, p. 49. 
+ ‘Trans. Entom. Soc.,’ 1885, p. 181. 
