330 HYMENOPTERA. 



16. Trypoxylon ORNATUM. 



Female. Length 4 lines. — Black : the face clothed with 

 golden pubescence, inchiding the emargination of the eyes ; the 

 palpi and mandibles pale testaceous, the latter ferruginous at 

 their apex ; the cheeks have a thin golden pubescence. The 

 posterior margin of the prothorax, the tubercles, an epaulet over 

 the tegulae, and a patch on each side of the post-scutellum, 

 covered with golden pubescence ; the mesothorax and scutellum 

 shining, with scattered shallow punctures ; the metathorax trans- 

 versely striated ; from the insertion of the abdomen a broad deep 

 groove passes about half-way upwards, at its termination is a 

 shallow subtriangular depression ; the wings hyaline, their apical 

 margins clouded, the nervures testaceous. Abdomen clavate, 

 the base of the second segment rufo-testaceous. 



Hab. Brazil. (Coll. F. Smith.) 



This species closely resembles the T. fugax of Fabricius, but 

 is at once distinguished by the sculpture of the metathorax ; in 

 fugax it is smooth, shining and convex. 



17. Trypoxylon excavatum. B.M. 



Female. Length 5 lines. — Black: the face covered with 

 silvery pubescence ; the mandibles rufo-piceous, palest at their 

 base. Thorax: the sides, beneath the metathorax and legs, with 

 a thin cinereous pubescence, at the sides of the metathorax it 

 has a silvery brightness ; the mesothorax and scutellum very 

 smooth and shining ; at the sides of the post-scutellum a little 

 silvery-white pubescence ; the metathorax above with a broad 

 deep excavation which narrows towards the verge of the trunca- 

 tion, and forms a deep channel which runs down to the insertion 

 of the abdomen; the excavation has a few faintly impressed 

 transverse lines in the middle ; wings hyaline, with a fuscous 

 cloud occupying the marginal cell as well as the extreme apex of 

 the wings. Abdomen covered with fine cinereous pile, most 

 dense on the basal margins of the segments. 



The male closely resembles the female, but has the mandibles 

 paler, and has also the base of the first joint of the anterior and 

 intermediate tarsi pale ; the second and third segments of the 

 abdomen are deeply concave beneath, and very smooth and 

 shining. 



Hab. Jamaica. 



18. Trypoxylon subimpressum. B.M. 

 Male, Length 4 lines. — Black : the face with a dense silvery 



