174 SMITH ON HYMENOPTERA OF ABU ISLANDS. 



Male. Length 9 lines. Ferruginous ; the head of a yellow testaceous, 

 with the vertex and antennae black ; the scape ferruginous in front ; 

 the mandibles black. Thorax : the mesothorax and scutellum trans- 

 versely rugose, the former with two deeply impressed lines in front, 

 which converge inwards, and meet in the middle of the disk ; wings 

 hyaline, with a yellow tinge on the anterior pair, the nervures black ; 

 a black stripe crosses the middle of the marginal cell, and terminates 

 at the inferior margin of the discoidal cell ; the legs ferruginous, with 

 the posterior tarsi black. Abdomen smooth, shining, ferruginous. 



Hob. Aru. 



2. Rhyssa vestigator. R. ferruginea ; antennis, mesothorace, me- 

 tathoracisque basi nigris ; abdomine lineari, nitido et Isevi ; alis hya- 

 linis, apice subfuscato. 



Male. Length 9 lines. Head testaceous -yellow, with the vertex ferru- 

 ginous; the antennae fusco-ferruginous. Thorax black, with the 

 prothorax, a large oblique spot beneath the wings, the scutellum, and 

 metathorax yellow, the base of the latter black ; the mesothorax and 

 scutellum rugose ; the metathorax smooth and shining ; the legs 

 ferruginous, with the anterior coxse in front and the posterior pair 

 behind yellow ; the posterior coxae black beneath ; wings hyaline, 

 faintly clouded at their apical margins. Abdomen elongate, linear, 

 glossy, smooth, and shining, ferruginous, with the base and lateral 

 margins blackish. 



Hah. Aru. 



G-en. Beacon, Fair, 



\. Bracon basalis. B. capite, thorace, pedibus anticis et inter- 

 mediis, femoribus posticis ferrugineis; tibiis tarsisque et abdomine 

 nigris, segmento basali flavo ; alis fusco-hyalinis. 



Female. Length 4^ lines. The head, scape in front, thorax, anterior 

 and intermediate legs, the posterior coxae, trochanters, and femora, 

 and the first segment of the abdomen, and a semicircular spot in the 

 middle of the base of the second, yellow-ferruginous ; the antennae, 

 the posterior tibiae and tarsi, fuscous ; abdomen shining black ; the 

 thorax smooth and shining ; the wings fusco-hy aline. The basal 

 segment of the abdomen with a longitudinal impressed line on each 

 side, the second segment with an oblique depression, the third with 

 an impressed line, curved forwards and extending to the lateral mar- 

 gins ; the base of the segment has a row of short, deeply impressed 

 striae ; the ovipositor shorter than the abdomen. 



Hah, Aru. 



2. Bracon albo-marginatus. JB. capite, thorace pedibusque ferru- 

 gineis ; abdomine nigris annulis albo-marginatis ; alis fusco-hyalinis. 



Female. Length A\ lines. Head, thorax, and legs ferruginous, smooth, 

 and shining; antennae and abdomen black, the latter smooth and 



