Neiu or little knmvn SojUh African Mntillidce (Hymenoptera). 389 



segment the slightly elongated punctures of which are nearly con- 

 tiguous, the punctuation of the other segments is finer, but the last 

 segment is closely punctate, not striate ; spurs of tibiae black ; wings 

 infuscate but more hyaline towards the base, radial cell truncate at 

 apex, stigma very small, three closed cubital cells and two recurrent 

 nervures, the first of which abuts slightly before and the second after 

 the middle of the second and third cells respectively. 



Length 9^ mm. ; width (wings expanded) 16^^ mm. 



Hab. Cape Colony (Matjesfontein), R. M. Lightfoot. 



MuTiLLA (Myrmilla) bidentata, $ , Audr. 



(? . Black, with the whole upper side of the thorax ferruginous 

 red but with the frontal edge of the pronotum, the sides and the 

 posterior part of the metanotum slightly infuscate ; abdomen nearly 

 sessile, first segment with an apical median silky white sub-triangu- 

 larly ovate patch, second segment with an ovate median whitish 

 yellow patch situated at a short distance from the apex but not 

 reaching it, third segment completely covered with white pubes- 

 cence, fifth and sixth pubescent white in the centre ; no wings. 



Head one-third broader than long on the vertex, slightly narrowed 

 behind the eyes with the basal margin nearly straight but with the 

 angles slightly obtuse ; eyes large, bulging, not incised inwardly, the 

 space behind the eyes equal in length to that of the eyes ; whole 

 surface covered with sub-reticulate punctures with sub-longitudinal 

 slightly raised walls in the central posterior part of the vertex ; 

 antennae somewhat slender, the first joint cylindrical, strongly 

 curving outwardly, second joint very small, third longer than the 

 fourth, and a little more than three times as long as the second ; the 

 head has no appressed pubescence except at the base of the man- 

 dibles, and is moderately bristling with black setae above and white 

 ones on the sides ; pronotum short, somewhat arcuate in front with 

 the angles sharp and the sides parallel, but it is slightly narrower 

 laterally at the suture than at the apex, posterior angles sharp ; 

 mesonotum nearly parallel but narrower than the pronotum at 

 apex ; scutellum broadly arcuate, transverse ; metanotum gradually 

 ampliate, rounded from the base, broader across the middle than the 

 anterior part of the pronotum, very convex on the upper side, pro- 

 vided at the top of the declivity which is vertical with two long 

 horizontal cylindrical spines set respectively at an equal distance 

 from the strongly rounded lateral angle of the declivity and of the 

 centre ; the pronotum and the scutellum are foveolate punctate ; 



