COLLECTED IN BORNEO, ETC. 103 



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

 tegulae 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 obliquely 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. 



Earn. BEMBICID.E, Westto. 



G-eii. Bembex, Fair. 



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

 Hab. Borneo (Sarawak). Sumatra. 



Fam. CRABKONTM:, Leach. 



Gen. Trypoxylon, Latr. 



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

 Hab. Singapore. Madras. 



2. Trypoxylon petio latum. T. nigrum nitidum, petiolo gracili 

 elongato ; abdominis articulis secundo et tertio ferrugineis. 



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

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

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

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

 diate tarsi, the extreme base of the posterior tibia?, 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. JS 



