On some South- African Phyllopoda. 17 



Distribution. — The specimens examined by Grube 

 were taken by Dr. Strauch from a lake off Bonsanda in 

 Algeria. The Apus dispar of Brauer, which I regard as 

 the same species, was raised by that author from dried 

 mud taken from a swamp off Tara el Chadra in Upper Egypt 



2. Streptoceplialus gracilis, G. O Sars, n. sp. 



(PL II). 



Specific Characters. — Body in both sexes very 

 slender and elongated, with the posterior division much 

 longer than the anterior. Head of about the same size in 

 the two sexes, in female evenly rounded in front, in male 

 produced to a conical projection, slightly emarginated at the 

 tip. Trunk simple, cylindric, with none of the segments 

 expanded laterally, Genital region comparatively small, 

 scarcely exceeding the 1st caudal segment in length; mar- 

 supial pouch in female long and narrow, extending to the 

 end of the 4th caudal segment. Tail very slender, and, 

 not including the caudal rami, considerably exceeding the 

 trunk in length. Caudal rami of the same appearance in 

 the two sexes, about 1 /± the length of the tail, narrow, slightly 

 incurved, tapering gradually towards the end, marginal setæ 

 very strong, densely crowded together, and finely plumous, 

 except those of the distal part of the inner edge, which 

 are rather short and spiniform. Antennæ in female simple, 

 blade-like, each terminating in a short, somewhat recurved 

 point; those of male very much elongated, and bent in a 

 sigmoid manner, basal part armed at the end outside with 

 a strong, incurved claw, terminal part very flexible, cylindrical, 

 abruptly bent in the middle, and terminating in a slightly 



2 — Archiv for Math, og Naturv. B. XX. ,Nr. 4. 



Trykt den 14de Januar 189S. 



