TURNER— FOSSORIAL HYMENOPTERA 373 



23. Trypoxylon scutifrons Sauss. 



Trypoxylon scutifrons Sauss., Grandidier : Hist. Madagascar xx. p. 523, 1892. 



Locality. Astove (R. P. Dupont). Also from Madagascar. The Astove specimen 

 is in the British Museum. This species was not obtained by the Percy Sladen Trust 

 Expeditions. 



Genus Crabro Fabr. 



24. Crabro (Rhopalum) oceanicus, sp. n. 



$ . Minuta, nigra, scapo, pedibusque anterioribus et intermediis flavis ; abdomine 

 subtus ferrugineo, segmento dorsali tertio fusco-feiTugineo ; alis hyalinis. 



$ . Mandibles bidentate at the apex ; clypeus flat, without a carina, covered with 

 delicate silver pubescence. Antennas inserted close to the eyes, much further from each 

 other than from the eyes, which are separated by a distance equal to about half the length 

 of the scape, the first joint of the flagellum a little longer than the second. Posterior 

 ocelli near together, about twice as far from the eyes as from each other and further from 

 the posterior margin of the head than from the eyes. Head, thorax and median segment 

 smooth and shining, the anterior angles of the pronotum slightly rounded ; the mesonotum 

 with a delicately impressed line from the anterior margin to the middle ; median segment 

 with a longitudinal sulcus, shallow on the dorsal surface, deep on the posterior slope. 

 Petiole very slender, as long as the thorax without the median segment, swollen at the 

 apex ; second abdominal segment more than half as long as the petiole, very narrow at the 

 base, gradually widened to the apex ; the fourth segment the broadest ; apical segment 

 broadly triangular. Posterior tibiae swollen towards the apex, with a few delicate spines 

 on the outer margin. The recurrent nervure is received beyond the middle of the cubital 

 cell. 



Black ; the scape and the anterior and intermediate legs pale yellow ; abdomen 

 beneath ferruginous, the third and fourth dorsal segments ferruginous at the base, the 

 third at the apex fuscous. Teguke testaceous ; wings hyaline, iridescent, nervures black. 



Length 5 mm. 



$. Similar to the female. There are four minute teeth on the anterior margin of 

 the clypeus. 



Length 4 mm. 



Localities. Seychelles : Mahe\ 1 specimen obtained flying round a Roscheria-p;i\ui 

 in high damp forest on summit of " montagne Anse Major," over 2000 ft., 1. II. 1909 : 

 Silhouette, 1 specimen obtained in forest above Mare aux Cochons, 1908 (H. Scott). 



25. Crabro (Dasyproctus) scotti, sp. n. 



£. Nigra, alutacea, mandibulis, clypeo, flagelloque basi ferrugineis ; scapo, pronoto, 

 pro- et mesopleuris, tegulis, mesonoti macula magna margine posteriore lineisque laterali- 

 bus ante tegulas, scutello, postscutello, segmento mediano basi apice lateribusque, pedi- 

 busque ochraceis. 



$. Mandibles tridentate at the apex, the inner tooth small and short. Clypeus 

 much broader than long, opaque and almost smooth, witli an obscure median carina, with 

 SECOND SERIES— ZOOLOGY, VOL. XIV. 48 



