P. CAMERON. HYMENOPTERA. 217 



narrowly, the 2 apical entirely black; the hind tibiae may be entirely black below. Wings 

 hyaline, the stigma and nervures black, the areolet narrow, twice longer along the radius and 

 cubitus than along the transverse nervures; the transverse médian nervure interstitial, the 

 récurrent received near the middle of the areolet. cf • 



Length 12 m. m. 



Face closely, distinctly punctured, the clypeus only sparsely punctured, the front and 

 vertex smooth ; the temples almost obsolète above, the occiput transverse. The lower part of 

 the propleurae, the mesonotum and the scutellums smooth, the rest closely, distinctly punctured, 

 the metathorax more strongly than the rest, the base behind the keel being also punctured, 

 the centre only weakly and sparsely. The metanotum has a graduai rounded slope ; its spiracles 

 are small, oval, twice longer than wide; on the apex the punctures run into reticulations. 



2. Mesostenus ornatifrons sp. n. 



Lorentz River, September. 



Black, the palpi, a large mark on the vertex, extending half way down the front, the 

 part on the former becoming gradually widened, the 2 parts uniting below the ocelli, where 

 they are rounded, a conical mark, longer than it is wide at the base, on the apex of the 

 middle lobe of the mesonotum, the scutellum, a large transverse mark on the centre of the 

 apical part of the metanotum, the base transverse, with the sidës rounded, the apex narrowing 

 slightly obliquely towards the middle, a mark under the hind wings, rounded at the base and 

 apex, the latter narrower than the former, the middle below with a rounded projection, a 

 larger transverse, somewhat heart-shaped spot on the sides of the base of the metanotum, 

 extending on to the pleurae and the apices of the abdominal segments, that on the i st distinctly, 

 widely, roundly incised, the others dilated backwards laterally and the apices of the ventral 

 segments, whitish yellow. Four front legs white, the femora tinged with fulvous, the hind 

 coxae black, the basai three fourths white above; the basai joint of the trochanters white, the 

 apical black, the femora rufo-fulvous, narrowly black at the base and apex, the tibiae black, 

 with a white line as long as the longer hinder spur, the calcaria black, the tarsi white, the 

 basai third of the basai joint and the apical black. Wings hyaline, the stigma and nervures 

 black, the areolet minute, square, open at the apex. cf • 



Length 9 m. m. 



Face roundly, broadly raised in the centre, irregularly rugose, the sides smooth. Meso- 

 notum distinctly trilobate, the middle lobe reaching to the base of the apical third, its apex 

 broadly rounded. Basai area of metanotum almost smooth, the apical part at the base irregularly, 

 not very strongly longitudinally striated, the apical slope much more strongly, obliquely 

 striated. Propleurae smooth, a V-shaped striated line on the upper half; the mesopleurae 

 finely, closely longitudinally striated, except on the upper, apical half; the sternal furrow 

 wide, strongly crenulated. Metapleurae closely, obliquely striated from the transverse keel. 

 First abdominal segment slender, hardly widened towards the apex. 



3. Mesostenus leucostomiis sp. n. 



Black, shining, the lower half of the propleurae with strong, distinctly separated curved 

 striae, a narrow curved band on the mesopleurae, commencing at the tubercles and ending 



