new Species of African Diploptera. 451 



i'. riead no broader than tlmrav, nil tlie 



tenuiiial abdoiiiiiial segimnils red- 



ferni^inoiis L. rothschildanus, Biiyss. 



b. MortM-dbiist insects; petiole with a dis- 

 tinct spine at base, shorter tliaii thorax. 

 a-. Median segment rounded dorsally, 



V'k mm. long L. caffra, sp. n. 



b-. Median segment with a depression 



on middle of dorsal surface, 7 mm. 



long L. (jamhiensis, sp. n, 



Labus siva/ei, sp. n. 



L. cltnilenni Biinilis, sed major; nigcr ; prothorace, segmentorum 

 1, 2 abdominis margiue postico llavo fasciatis. Alls liyaliuis. 



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

 border, scajjc beneath, prouotiini in front, teguUe, two spots 

 on the scutellum, and narrow fasciae on the apical margins 

 of abdominal segments ] 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 tlie apex, sides of the emargination terminated in 

 sharp teeth ; head i-ather 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 ])rofile 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. 



(5 . Differs from the female in the totally yellow clypeus, 

 and ilagellum reddish brown beneath. 



Hab. The Nubian Desert between Korosko and Abu 

 llamed [Dr. Swale); 2 ?, 1 J. 



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



The Yicomte du Buysson has been kind enough to 

 examine a sj)eeimen of L. swulei and to compare it with that 

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

 has the clypeus more deeply emarginate and the extremity 

 of the petiole depressed ; the ])etiole is longer and more 

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

 smaller species. 



