new Species of African Diploptera. 451 



b'. Head no broader than thorax, all the 

 terminal abdominal segments red- 

 ferruginous L. rothschildcmus, Buyss. 



h. More robust insects ; petiole with a dis- 

 tinct spine at base, shorter than thorax. 



fl^. Median segment rounded dorsally, 



8i mm. long L. caffra, sp. n. 



h^. Median segment with a depression 

 on middle of dorsal surface, 7 mm. 

 long L. gamhiensis, sp. n, 



Labus swalei, sp. n. 



L. cJiu'Ieaui similis, sed major; niger ; prothorace, segmentorum 

 1, 2 abdominis margine postico flavo fasciatis. Alis hyaliuis. 



? . Black ; clypeus, except a narrow lateral and apical 

 border, scape beneath, pronotum in front, teguUe, two spots 

 on the scntellum, and narrow fasciae on the apical margins 

 of abdominal segments 1 and 2, pale yellow. 



Apex of femora and tibiae of all the legs pale yellow. 

 Tarsi testaceous. Petiole laterally and abdominal segments 

 3-6 obscurely ferruginous. 



Clypeus as broad as long, emarginate, narrowly produced 

 towards the apex, sides of the emargination terminated in 

 sharp teeth ; head rather broader than thorax ; postscutellum 

 bluntly bispinose ; median segment convex, the apical 

 angles produced. Petiole slender, rather longer than the 

 thorax, bearing two conspicuous lateral tubercles on the 

 basal third, depressed dorsally and broadest at the apex, 

 when seen in profile the petiole appears truncate anteriorly 

 and smaller posteriorly ; abdominal segment 2 rather long, 

 cup-shaped. Punctured, the head (except clypeus), thorax, 

 and second abdominal segment coarsely, remaining abdo- 

 minal segments minutely. The whole covered with a silvery- 

 grey pubescence, most conspicuous on vertex and median 

 segment. 



Length 5^ mm. 



J . Differs from the female in the totally yellow clypeus, 

 and flagellum reddish brown beneath. 



Hub. The Nubian Desert between Korosko and Abu 

 Hamed {Dr. Swale) ; 2 ? , 1 c? . 



This species is very near L. chudeaui, Du Buyss. 



The Vicomte du Buysson has been kind enough to 

 examine a specimen of L. sioulei and to compare it with that 

 species, from which he considers it to be distinct. L. swalei 

 has the clypeus more deeply emarginate and the extremity 

 of the petiole depressed ; the petiole is longer and more 

 slender than in L. chudeaui, which is also a considerably 

 smaller species. 



