COLLECTED IN BORNEO, ETC. 105 



with a silvery pubescence ; the tips of the mandibles ferruginous ; the 

 tegulse testaceous ; the nervures brown ; the costal nervure and the 

 stigma black ; the tibiae and tarsi simple ; the metathorax with a 

 deep triangular depression at its base, which is obhquely striated on 

 each side, and from which a deep smooth channel runs to the apex of 

 the metathorax; on each side of the depression it is smooth and 

 shining, and finely punctured beyond. Abdomen highly polished, with 

 the margins of the segments deeply depressed ; the apical margins 

 with a fine short silky white pubescence ; the sixth segment acute at 

 the apex. 



Hab. Borneo (Sarawak). 



I have formed a section for the reception of this species, which I regard 

 as a true Pison, having the petiolated cell obsolete, or rather the api- 

 cal nervure of the usually enclosed cell. I have seen other species with 

 the nervure obsolete in both, or sometimes only in one wing ; the latter 

 circumstance confirms my opinion of this species only being an excep- 

 tional case, and that it is a true Pison. 



Fam. BEMBICID^, Westw. 



Gen. Bembex, Fabr. 



Bembex melancholica. Smith, Cat. Hym. pt. iv. p. 328. 

 Hab. Borneo (Sarawak). Sumatra. 



Fam. CRABEONID^, Leach. 



Gen. Trtpoxylon, Latr. 



1. Trypoxylon bicolor. Smith, Cat. Hym. pt. iv. p. 377- 

 Hab. Singapore. Madras. 



2. Trypoxylon petiolatum. T. nigrum nitidum, petiolo gracili 

 elongato ; abdominis articulis secundo et tertio ferrugineis. 



Female. Length 7 lines. Black, very smooth and shining : the clypeus, 

 the inner orbits of the eyes, the emargination of the eyes, and the 

 cheeks, with a glittering silvery pile ; the mandibles ferruginous ; the 

 palpi pale testaceous. Thorax : the tegulae, anterior and interme- 

 diate tarsi, the extreme base of the posterior tibiae, the calcaria, and 

 the claws and pulvillus of the tarsi, pale rufo-testaceous ; the apical 

 joints of the tarsi fuscous ; the sides of the thorax sprinkled with 

 glittering silvery hairs; the wings hyaline, the nervures rufo-fuscous. 

 Abdomen : the petiole slender, as long as the head and thorax, with 

 the apex of its node, the second and third segments, ferruginous; 

 covered with a fine changeable pile, only observable in certain lights, 

 Hab. Borneo (Sarawak). 

 linn. soc. — zoology. 8 



