P. CAMERON. HYMENOPTERA. 225 



occupying the space betvveen the basai crenulated furrow and the apical keel, narrowed and 

 bluntly rounded above and below, but with the apex below incised, slightly more than the 

 basai half of the i st abdominal segment, the black apical part obliquely narrowed at the base, 

 broad bands on the 2 nd to 6* on the base, the bands on the 2nd a nd yà more than one 

 third of the length of the segments and roundly, broadly narrowed at the apex, and the 8 th 

 entirely pallid yellow, the 7 th segment being immaculate. Coxae and trochanters white, the 

 apical half of the hinder coxae black on slightly more than the apical half, more broadly 

 above than below and laterally, the hinder trochanters white marked with black, the femora 

 rufo-fulvous on the middle pair, black behind, the hinder of a deeper red, black below and 

 at the apex above, the anterior yellow, tinged with fulvous, the 4 anterior tibiae white, rufous 

 at the base and apex, the hinder black, with a broad white band near the base, the hind 

 tarsi white, the basai joint narrowly at the base and the apical two joints, black. Wings 

 hyaline, the stigma and nervures black, the areolet minute, punctiform. Q. 



Length 10 m. m., terebra 2 m. m. 



The face is smooth, shining, the centre clearly separated by straight furrows, which 

 converge slightly below and is separated from the clypeus. The large mark on the metanotum 

 is rounded behind, transverse below. The apical two-thirds of the 6 th antennal joint and the 

 whole of the 7* to I3 th are white. The ventral surface is for the greater part pallid yellow. 



7. Mesostenoideus nigrispinus sp. n. 

 Bivak Island, January. 



Black, shining, a weak, narrow band on the central hollow of the propleurae, a broad 

 band on the mesopleurae, commencing at the base above, running obliquely to shortly beyond 

 the middle, then curving backwards roundly to the base, a broad oblique band on the lower 

 three-fourths of the metapleurae in the centre, this band being stronger and more regular 

 than the others, obliquely striated. Basai area of metanotum smooth, the central irregularly, 

 not very strongly or closely punctured, the sides irregularly obliquely, rather strongly striated, 

 the apical slope more strongly and closely striated, the middle longitudinally striated, the 

 sides more strongly obliquely striated ; the spines short, bluntly triangular, the 2 united by a 

 slightly curved kéel, which is thinnest in the middle. A narrow keel runs down from the 

 ocelli to the antennae, it is irregularly, narrowly bordered by fine close striae. The raised 

 part of the face is closely bordered by fine striae. The following parts are whitish yellow ; 

 the apical half of the 6 th antennal joints, the 7 th to io th entirely and the ii'h to near the 

 apex, palpi, a large mark on the sides of the vertex, commencing at the end of the vertex 

 and reaching to the top of the front, becoming slightly, gradually, widened below, with the 

 top and bottom obliquely truncated, the scutellum, a large spot, twice wider than long, the 

 top rounded, not touching the upper keel, the bottom transverse, touching the lower keel, 

 the sides becoming slightly widened from above, an irregular, squarish spot on the base of 

 the metapleurae near the keel, the narrowed basai half of the ist abdominal segment above, 

 the basai fourth of the 2 n<i , the apex of the mark with a shallow rounded incision in the 

 middle of the apex, a roundly incised mark on the base of the y d , the middle narrow, the 

 sides extending to near the apex of the segment, almost the apical half of the 4 th , the line 

 of equal width, a similar line on the outer third of the 5*, a shorter one on the 6 th , it 



