112 Mr. R. E. Turner on some neic or 



in colour; the clypens is also rather shorter and not pointed 

 at the base as in T. frenchi. 'J'he markings are very similar 

 to those of T. meUeus, Westvv,, but the colour is pale yellow 

 instead of orange. 



Thynnus atrocior, sp. n. 



(J . Clypeus coarsely punctured, some of the punctures 

 confluent longitudinally, very prominent at the extreme base, 

 then depressed and flattened to the apex, where it is broadly 

 truncate, with very slightly prominent angles; the labrum 

 projectinpj a little beyond the clypeus, not bilobed. Maxilla? 

 with a fringe of very long hairs on the outer margin. Head 

 closely and rather deeply punctured, the antennae of equal 

 thickness throughout, a little further from each other at the 

 base than from the eyes, the second j"int of the Hagellnm 

 only two-thirds of the length of the third ; the prominence 

 between the antennae broadly rounded at the apex and con- 

 nected by a very short carina with the pointed base of the 

 clypeus; a delicate carina from just below the anterior 

 ocellus reaching the apex of the interantennal prominence. 

 Thorax closely punctured, the pronotum with a transverse 

 groove just behind the anterior margin, the anterior angles 

 scarcely jnominent; the mesonotum w^ith the usual two 

 longitudinal sulci on each side, the inner one much the 

 deepest; the scutellum about two-thirds of the length of the 

 mesonotum, convex and longitudinally subcarinaie in the 

 middle. Median segment rather finely rugose, with a longi- 

 tudinal depression from the base, oblique and shining 

 posteriorly, with a deep sulcus on each side close to the apex. 

 Abdomen closely, but not deeply punctured ; the first seg- 

 ment as broad at the apex as the second, the segment feebly 

 constricted at the base, and narrowly de) ressed on the ajjical 

 margin, the first ventral segment divided from the second by 

 a moderately deep groove, the sixth segment with a short 

 spine on each side at the apical angle ; the dorsal plate of 

 the epipygium flatly produce!, truncate at the apex and 

 coarsely longitudinally striated. Hypopygium prominently 

 rounded at the basal angles, but not toothed, thence rather 

 broadly produced and rounded at the apex, without an apical 

 spine; transversely striated above near the base, with a 

 longitudinal, low carina near the apex; punctured beneath, 

 witli a longitudinal carina. 



Black ; with close grey pubescence, longest on the sides 

 of the head and abdomen and on the pleurae, the spines of 

 the tibiae whitish, the mandibles dark fusco-ferruginous. 



