BEACON. 313 



posterior transverse furrows tend to become obsolete. Myosoma, Brulle, I have not 

 adopted, as it is only distinguished by having the legs more pilose than is usual with 

 the majority of the species of Br aeon ; in this respect there is so much variation that it 

 is impossible to draw a hard-and-fast line. 



I have divided the genus into groups. The chief points of distinction are to be 

 found in the form of the head and abdomen. In the abdomen the form of the petiole 

 shows a good deal of variation. The shape of the eyes and of the frontal region is 

 likewise of importance. The alar neuration does not exhibit much variation. I have, 

 in most cases, not given the number of joints in the antennae: in the first place, 

 they are very difficult to count, owing to their being so closely soldered together ; 

 and, secondly, because the tips are broken off in nearly all the specimens before 

 me. 



i. Abdomen not punctured nor striated. 

 The group of B. compunctoe. 



Antennae as long as the body, the depression between them not deep. Abdomen with a 

 stout keel down the centre of the second segment; the depression on the sides 

 rather narrow, not reaching to the apex ; suturiform articulation nearly transverse, 

 not reaching to the sides, dilated at the apex and also narrowly backwards; a 

 furrow on the third segment. Ovipositor longer than the body, which is black, 

 except at the base of the abdomen. Wings black, with a hyaline band at the stigma. 



I am not sure whether this species should not be treated as an Iphiaulax, but the 

 suturiform articulation is not bifurcated at the sides, although there is a furrow on 

 the third segment. 



— u*. l. Bracon compunctor. (Tab. XIII. fig. 11.) 



Niger ; abdominis basi lsete rufa ; alis fuliginosis, fascia medio hyalina ; terebra quam corpus multo longiore. 

 Long. 12-13 millim. ; terebra 15-16 millim. 



Hab. Panama, Bugaba 800 to 1500 feet {Champion). 



Antennae longer than the body; 70-74 jointed, the basal joint nearly as long as the 

 third and fourth together, these latter being subequal. Head covered with longish 

 black hair; face almost transverse, scarcely punctured; clypeus not projecting and 

 without any depression at its base; front depressed in the middle (the depression 

 reaching to the ocelli), and with a narrow furrow down its centre. Thorax shining, 

 sparsely covered with black hair. The central part of the petiole wide, becoming 

 slightly enlarged towards the apex, the furrows broad and deep ; a narrower furrow a 

 little below the side, which is sharply ridged. Abdomen longer than the head and 



biol. CENTR.-AMEK., Hymenopt, October 1886. 2 ss 



