246 HYMENOPTEKA. 



apex, on the top of the hind coxae ; hind trochanters and femora broadly above, the hind 

 tibiae almost entirely, and the base and apex of the tarsi, black. The antenna? are broken 

 off" beyond the base of the flagellum ; the scape is yellow in the centre beneath. Areolet 

 longer than broad, narrow, open at the apex. 



5. Polygenus orizabensis. 



Niger ; facie, orbitis, tegulis, linea pronoti, maculis pleuratis, maculis 2 mesonoti, apice scutelli, postscutello, 

 maculis 2 metanoti abdominisque segmentis apice, flavis ; pedibus flavis, coxis, trochanteribus, femoribus 

 supra apiceque tibiarum posticarum, nigris ; alis hyalinis, stigmate nigro. 2 • 



Long. 17 millim. ; terebra 5 millim. 



Hab. Mexico, Orizaba (Bilimek). 



Antenna? black, covered with microscopic down (broken off beyond the tenth joint). 

 Head yellow, the apex of the mandibles, the vertex above the antennae in the centre, 

 and the occiput, black. Face, especially the sides, transversely striated. Frontal 

 spines small, united at the base. Thorax strongly punctured ; the pleurae (especially 

 the metapleurae) obliquely striated, except the tubercles below the tegulae, and a 

 shining impunctate projecting point in the centre of the mesopleurae. Base of the 

 metanotum irregularly reticulated, the apex transversely striated, and with a rather 

 abrupt slope. Scutellum opaque, aciculate. The lobes of the pronotum project, and 

 are broadly yellow ; the mesonotal sutures are not deep, the middle lobe not being 

 much elevated above the lateral ones, and they are lined for three fourths of their 

 extent by a narrow yellow line. Prosternum broadly, a broad oblique mark on the 

 mesopleurae, the tubercles under the tegulae, a somewhat triangular mark immediately 

 under the hind wings, a large oblique mark on the metapleurae, two longish marks 

 on the apex of the metanotum covering the tubercles (which are longish, stout, and 

 slightly curved), the keels in front of the scutellum, the apex of the latter, and the 

 sutures, yellow. The two transverse keels on the metanotum are distinct, and there is 

 a square area, raised in the centre, at the base in the middle. Petiole dilated laterally 

 at the extreme base and becoming widened towards the apex, black ; the under side 

 and apex yellow ; the other segments black, yellow at the sides, beneath, and at the 

 apex above. Legs yellow, all the femora lined above with black ; two black lines 

 (united at the apex) on the sides of the hind coxae; the basal joint of the hind 

 trochanters, the extreme apex of the apical joint, and the base and apex of the hind 

 ibiae (the apex not all round), black. Areolet longer than broad, narrow, the outer 

 and inner nervures bullated. 



6. Polysenus basimacula. (Tab. IX. figg. 24 § , 25 6 .) 



Niger, albo varius ; abdomine rufo, basi nigro ; pedibus fulvo-rufis, femoribus nigro lineatis, coxis anterioribus 



flavis. 

 Long. 14 millim. ; terebra fere 4 millim. 



Hab . Guatemala, San Geronimo (Champion). 



