P. CAMERON. HYMENOPTERA. 221 



16(17) The metanotal marks oblique on the innerside, the space between them therefore wider 

 in front, the black on the base of i st abdominal segment separated from the apical black 

 mark, which is bluntly triangular ........ heterospilus. 



17 (16) The metanotal marks not oblique, the space between them of equal width, the black on 

 the base of i st abdominal segment united to that on the apex, which is semicircular 



ftarvide?itatns. 

 18(15) The marks united at the top by a triangular one, the face with a yellow mark. 



striatipleuris . 



1. Mesosteiioidej.is spilonotus sp. n. 



Lorentz River, September. 



Black, shining, smooth, the face smooth in the centre, bordered by a strongly punctured 

 band, then by a transversely striated one, the space next to the eyes being smooth, the 

 metanotum behind the keel closely, not very strongly transversely striated, the striae more 

 or Iess intertwining, the apical slope is more strongly and regularly transversely striated, the 

 metapleurae not quite so strongly obliquely so ; the palpi, a large triangular mark on the sides 

 of the vertex, the narrowed end on the inner side, opposite the lower ocellus, a bluntly 

 conical spot on the apex of the central mesonotal lobe, the scutellum except the basai slope, 

 metanotal teeth, a large mark under the hind wings, the base bluntly roundly bilobate, the 

 apex also bilobate, but with the central incision wider and deeper, the lobes therefore smaller, 

 a smaller, irregularly squarish mark immediately behind the hind wings, a band on the apex 

 of the i 5t and 2 n <l segments, broadly roundly but not much narrowed at the base, a narrower 

 one on the 3 rd , a line of the same width on the outer third of the 4A and the whole of the 

 penultimate, pale yellow. Fore legs pallid yellow, the femora tinged with fuscous behind, the 

 tarsi fuscous black, the joints paler at the base, the coxae black at the base below ; the 

 middle pair similar, but darker coloured, the fuscous turning into black, the hind legs black, 

 the coxae with almost the basai half white above, the basai joint of the trochanters, a broad 

 line on the inner- and outerside of the basai half of the trochanters, a band near the base of 

 the tibiae, twice the length of the black basai part ; not quite the apical fourth of the basai 

 joint of the tarsi and the whole of the following three, yellowish white. Wings hyaline, the 

 nervures and stigma black, the middle nervures almost black ; the discocubital nervure broken 

 by a minute stump of a nervure. 9- 



Length 12 m. m., terebra 4 m. m. 



Antennae longer than the body, not much thickened towards the apex; the apical half 

 of the 6* and the 7A to ç/h white. Smooth and shining, except the metathorax behind the 

 keel, it béing there closely striated. The parapsidal furrows do not reach much beyond the 

 middle of the mesonotum ; they are deep, clearly defined and do not unité at the apex. 



2. Mesostenoideus Frederici sp. n. 



Bivak Island, September. 

 Black, the thorax with a plumbeous hue, the 8 th to 17* joints of the antennae white, 

 the scape obscure rufous below, a large mark on the sides of the vertex, obliquely truncated 

 above, becoming gradually widened below, where the 2 unité, palpi, scutellums, a small 

 squarish spot on the apex of the middle lobe of the mesonotum, a transverse mark in the 

 middle of the metanotum, rounded broadly inwardly at the apex, the base in the centre 

 Nova Guinea. IX. Zoologie. 29 



