KNOWLEDGE OF THE BRITISH BRACONID. 261 
specimens agree with Wesmael’s description, except that the 
head, thorax, and stigma are dark fuscous instead of black. 
Very similar in shape and size to M. thoracicus, but differing in 
that the thorax and stigma are black or blackish, the antenne 
46-jointed, and the second abscissa of the radius not longer than 
the first intercubital nervure. From M. infirmus it differs in 
size, in the length and number of joints of the antenne, and in 
many other ways; from M. marginator in size, in the wings 
being hyaline and not clouded, and also in the first abscissa of 
the radius being considerably shorter than the first intercubital 
nervure. 
M. infirmus (Nees).—Somewhat similar to M. collaris, but 
differing in having stouter legs, a much longer terebra, and in 
the second abscissa of the radius being as long as the first inter- 
cubital nervure. 
In Fitch’s boxes are four, one male and three females; these 
were probably once in Marshall’s collection, one card being 
marked ‘‘ St. A.” (St. Albans) in his writing.* 
M. equalis (sp. nov.). 
Fuscous, disc of mesothorax rufo-testaceous, third segment of the 
abdomen fusco-testaceous; palpi pale testaceous in both sexes, 
mandibles testaceous with fuscous tips; head fuscous except the 
clypeus which is testaceous; antenne fuscous, basally testaceous, 
elongate, 39-40-jointed in both sexes, longer than the body; meta- 
thorax shagreened: wings hyaline, stigma and nervures testaceous, 
the former with a darker spot of varying size. Second abscissa of the 
radius as long as the first intercubital nervure; legs testaceous, claws 
dark: abdominal segments one and two distinctly striolated, first 
segment scarcely narrowed from the apex to the tubercles; terebra 
almost as long as the abdomen. 
Described from four males and two females. 
A gregarious parasite, the cocoons being enclosed in a felt- 
like oblong ball which assumes the proportions of the pupal 
chamber of the host. Both males and females in the same 
brood. This species somewhat resembles M. collaris, but is 
most certainly not the M. collaris described by Marshall in 
Trans. Entom. Soc. 1888, p. 197, and Species des Hym. vol. 5, 
p. 238; it agrees more closely with Wesmael’s description,+ but 
as Marshall was acquainted with Wesmael’s insects, no doubt he 
was right in the synonymy of his M. collaris with Bracon collaris 
of Wesmael; unfortunately, the latter’s description lacks any 
mention of the length of the first abscissa of the radius or number 
of joints of the antenne. 
Among Fitch’s insects is a card bearing six and a ball of 
cocoons to which is attached a label marked ‘‘G. C. Bignell,” 
* Mr. Harwood also considers this to be Marshall's writing. 
+ Nouv. Mém., Ac. Brux. 1885, p. 179. 
