8 Cameron, Hymenoptera.from Greymoiith. 



narrowed at the top, where it is in width less than the 

 space bounded by the recurrent and the second transverse 

 cubital nervures ; the transverse median nervure is inter- 

 stitial. Abdomen smooth, shining, impunctate ; the 

 gastrocoeli are indicated by a shallow depression. 



The scutellum in this species might refer it to Hoplis- 

 menus, but it differs from that in having no spines on the 

 median segment. The shape of the scutellum is quite 

 similar to what it is in some Mexican species of Ichneumon, 

 e.g. I. aztecus. 



B. Scutellum flat, normal. 



Ichneumon actista, sp. nov. 



Niger, thorace coxisque albo-maculatis ; pedibus rufis ; 

 alts fere hyalinis, stigmate nervisque nigris, $ . Long. 14 mm. 



Antennae black ; the scape with a yellow mark in the 

 middle on the lower side. Head : the face below the 

 antennae, the mandibles except the teeth, the palpi, a 

 mark on the vertex touching the eyes, and a larger mark 

 behind lower down, yellow ; almost impunctate, the front 

 and vertex thickly covered with short blackish hair, the 

 labrum fringed with longish fulvous hair ; behind, it is as 

 long as the eyes and sharply oblique. Thorax oblique in 

 front ; the sides of the pronotum widely, a large square 

 mark on the mesonotum in the middle, the scutellum, post- 

 scutellum, the supramedian area of the metanotum, two 

 large marks on the mesopleurae, the anterior slightly the 

 larger, and a large oblique mark on the metapleurae, 

 yellow. Metanotal areae well developed ; the keels acute, 

 the supramedian rounded at the base ; the sides straight, 

 gradually narrowed to the apex, which is transverse ; the 

 apex has an oblique slope. The four anterior coxae are 

 white beneath ; the hinder have a large white mark at the 

 base above and beneath ; the trochanters are black. The 



