SMITH OK HYMEKOPTERA OF ARTI ISLANDS. 171 



Female. Length 5 lines. Ferruginous ; the face testaceous-yellow, an 

 elongate black spot on the vertex enclosing the ocelli and extending 

 to the insertion of the antennae ; the latter black, with the scape 

 ferruginous in front. Thorax : the scutellum elevated, forming a 

 compressed tubercle, its side view wedge-shaped ; the wings hyaline 

 the nervures black, the base of the wings yellowish ; the apical joints 

 of the intermediate tarsi, the tips of the posterior femora, the extreme 

 base of the tibiae, their apical half, and the tarsi black ; the inter- 

 mediate portion of the tibiae yellow ; the apical segment of the 

 abdomen black. 



Hab. Aru. 



Gen. Mesostenus, Grav. 



1. Mesostenus pictus. M. niger; capite thoraceque flavo striatis et 

 punctatis; pedibus flavis nigro et ferrugineo lavatis; segmentis ab- 

 dominalibus flavo marginatis ; alis hyalinis. 



Female. Length 8 lines. Black; a large ovate spot on the cheeks 

 touching the mandibles, the labrum, palpi, inner orbits of the eyes, 

 and from the 7th to the 10th joints of the antennae yellow^ish-white. 

 Thorax : an ovate spot in the middle of the disk of the mesothorax, 

 the tegulae, a spot beneath them, two larger spots beneath the wings, 

 the scutellum, a spot on the postscutellum uniting with another at the 

 base of the metathorax, a trilobed spot at its apex, and a subovate one 

 on each side yellowish-white ; the coxae white with black stains on the 

 intermediate and posterior pairs ; the femora white beneath, the ante- 

 rior and intermediate pairs with a black line above, the posterior pair 

 ferruginous above ; the tibiae and tarsi whitish beneath, stained more 

 or less fusco-ferruginous above; wings hyaline. Abdomen: all the 

 segments with yellowish-white fasciae on their apical margins, the 

 fasciae continued beneath ; the ovipositor about the length of the 

 abdomen, the valves broadest at their apex. 



Hab. Am. 



2. Mesostenus agilis. M. niger; antennis medio albis; thorace pe- 

 dibusque albo variegatis ; abdominis marginibus fasciis albis. 



Female. Length 6 lines. Black ; the joints of the antennae, from the 

 6th to 13th, white, the vertex also white. Thorax : a spot in the 

 middle of the disk of the mesothorax, the scutellum, a spot on the 

 postscutellum, two beneath the wings, the apex of the metathorax, 

 and a spot on each side white; the legs white, the anterior pair 

 slightly fuscous above ; the intermediate femora and tibiae beneath, 

 and the tarsi above, black ; the posterior femora above and beneath 

 the tibiae, except their extreme base and the base and apex of the 

 tarsi, black ; wings hyaline, the nervures black. Abdomen : the 

 apical margins of the segments, excepting the fourth and fifth, with 

 white fasciae, the second and third fasciae attenuated in the middle. 



Hab. Aru, 



