A Monograph of the Formicidae of South Africa. 547 



legs pale-brown, tarsi, mandibles and antennae fuscous ochreous. 

 Antennae densely pubescent ; the brow of the declivity of the epinotum 

 has a tuft of thin, long hairs on each side ; elsewhere the pubescence is 

 very sparse. Smooth and very shining, except the head, which is very 

 superficially reticulate-rugulose. Head trapezoidal, as long as wide 

 across the eyes. The latter large, occupying the anterior half of the 

 sides. Mandibles shining and bidentate. Clypeus with a transverse 

 groove across the median area. Scapes two and a-half times longer 

 than wide ; 1st joint of flagellum shining, the remaining joints dull, 

 3rd joint wider than long, the remaining joints as long as, or longer than 

 wide. Scutellum conical in outline, much higher than the epinotum. 

 First segment of petiole wider than long, declivous, a little narrowed 

 in front ; 2nd segment subglobose, a little wider than the 1st. 



Victoria Falls. A populous nest under the bark of a leguminous 

 tree (Baikaiea or allied genus), containing several dozens of 9 9 and 

 £ £ , and about three or four hundred £ $ . 



Sub-genus DECRACREMA, Forel. 



Ann. Soc. Ent. Belg., vol. 54, p. 18, 1910. 



Characters. 

 9 and $ with 10-jointed antennae. Otherwise like Cremastogaster, 

 s. str. 



C. (sub-gen. Decracrema) Arthur-Mulleri, Forel. 



(As race of gallicola, Forel) Mitth. Schweiz. Ent. Gres., vol. 9, p. 96, 



9, 1894. 

 Mayr, Ann. K.K.N.H. Mus. Wien, vol. 10, p. 144, 1895. 



" 9 • 3*8 mm. Club of antenna more or less 3-jointed. First 

 segment of petiole with a long thin tooth below in front. Dorsum of 

 thorax less uniformly flattened than in gallicola. The scattered 

 puncturation somewhat stronger. Epinotal spines even shorter than 

 in that species. Otherwise like the $ major of the type- species." 



Delagoa (Dr. Arthur Midler). 



This species and C. Liengmei were wrongly described by Forel as 

 forms of gallicola- Mayr, in correcting the error, remarks that 

 " C. gallicola has a short mesonotum strongly rounded from side to 

 side in front, and the 1st segment of the petiole has only a very small 

 tooth below, or none at all. C. Arthur-Mulleri has a much larger 

 mesonotum, and the meso-epinotal suture is much deeper ; the 

 1st segment of the petiole has a thin spine below in front, which is 

 directed steeply forwards and downwards. Larger than C. gallicola." 



35 



