EHYSSA. 261 



punctured, broader than long, slightly narrower towards the apex. Pleurae shining, 

 obscurely punctured, a longish longitudinal hollow in the middle. The mesonotum is 

 black, except laterally in front and down the centre. Scutellum testaceous, the sutures 

 black. There is a longish black mark under the fore wings ; the base and apex of the 

 metanotum and a broad line down its centre are black. The longish curved spiracles are 

 bordered with black. Metanotum shining, impunctate ; a curved transverse keel runs 

 across its centre, and an oblique one from the spiracles to the apex. Abdomen shining, 

 somewhat compressed, black above, the apex pilose ; in the centre of the penultimate 

 segment is a somewhat triangular depression covered with a white membrane ; the last 

 segment above forms a projecting thickly pilose lobe ; on the lower side it projects more, 

 and ends in two sharp horny processes which clasp the ovipositor. Ovipositor nearly 

 three times longer than the body, white at the apex. Legs shining ; the hind coxae 

 black at the base on the lower side. Areolet large, triangular, receiving the recurrent 

 nervure in the middle. 



2. Rhyssa carinifrons. 



Testacea, nigro varia ; antennis nigris, medio apiceque subtus testaceis ; pedibus rufo-testaceis ; basi et apice 

 coxarum posticarum, apice femorum, dimidio apicali tibiarum posticarum tarsisque, nigris ; alis byalinis, 

 apice fumato. 5 . 



Long. 21 minim- 

 ize. Nicaragua, Chontales (Janson) ; Panama (Boucard). 



Antennae as long as the body ; the base, the middle narrowly, and the apex (except 

 the extreme point), testaceous on the lower side. Face transversely punctured, the 

 vertex impunctate ; a distinct keel (separating the antennal depressions) runs down 

 from the ocelli to a little below the base of the antennae ; eyes margined, especially on 

 the inner side and above ; testaceous, the mandibles, the antennal depressions, a broad 

 transverse band on the vertex enclosing the ocelli, and the hind region, black. Thorax 

 formed as in B. nigritarsis, testaceous ; the mesonotum (except a broad mark in the 

 centre), the sutures, the base of the metanotum broadly, the sides of the pro thorax in 

 front, a large mark on the mesopleura, and the metapleura close to the sternum, black. 

 In the centre of the metanotum two short keels run from the transverse keel, forming 

 a somewhat square area. Abdomen black ; the ventral surface, a longish mark at the 

 base of the first segment in the centre, its apex and the apices of the other segments 

 broadly, testaceous. The middle coxae are black beneath ; the hind coxae are black on 

 the lower side at the base, and bear a longer black mark on the apex above, on the inner 

 side they are entirely black, except a small testaceous spot ; the hind femora are infus- 

 cate towards the apex, and more than the apical half of the hind tibiae is black ; tarsi 

 black, testaceous in the middle. 



What appears to be the male (from Panama) differs from the specimen from Nicaragua 

 in having a broad white band on the antennae close to the apex, and the yellow on the head 



