Some Ectoparasites in the South African Museum. 277 



Thorax. Sub-quadrangular, anteriorly angularly ernarginate, 3 

 minute hairs near spiracle, and inside and posterior to these the 

 usual pair of long hairs, under surface entirely bare. 



Abdomen. Without distinct segmentation. Integument rugose. 

 The limits of the segments, however, may be fairly judged by the 

 spiracles. In general each tergite bears a row of hairs, of which 

 the median pair and one below the spiracle on each side are stronger. 

 The spiracular hair is wanting on segment 4. Before the main row 

 of hairs there is another of fewer and weaker elements. The 

 chaetotaxy of tergites I. -VII. is : 



Tergites. I. II. III. IV. V. VI. VII. 



1st row double... j ( } * ~ ~ ~ ~ ~ ~ 



2nd row 12 10-12 14 13 13 10 4 



On the 8th and 9th tergites there are altogether some 26 small 

 hairs disposed as in figure. 



Under surface. First sternite 2 rows only, 8th and 9th bare. 



Long sub-spiracular hairs occur only on sternites 5-7. 



In the middle sternites 2-7 agree closely with the corresponding 

 tergites. 



The genital mark is dark, quadrate, 2 slight blunt anterior cornua 

 and a clear post-median oval space. Dorsally there are on each side 

 of the genital opening two chitinized plaques the anterior curved, 

 the posterior straight and almost at right angles to the first. The 

 genitalia reach back to the level of the 4th pair of stigmata. 



The anterior pair of legs are much slighter than the posterior pair 

 whose tibiae are unusually thick. 



5 . Similar in chaetotaxy and shape to $ , but with a more 

 pointed head before the antennae. Abdomen more truncated 

 posteriorly. Gonopods with 8-10 terminal bristles, of which one 

 is very strong. Genital mark like a hand looking-glass in shape. 

 9th sternite not markedly chitinized, with two slanting edges towards 

 the gonopods. These edges are fringed with soft hairs. On the 

 posterior edge there are a few backwardly directed hairs. The last 

 segment is almost entirely surmounted by a chitinous ring. Piaget's 

 description of the chaetotaxy is too incomplete, and his figure of 

 L. tibialis too diagrammatic for comparison. From the measure- 

 ments one sees that the present variety is a broader insect in the 

 head, thorax, and abdomen. It is also slightly larger in the , but 

 the 5 appears to be shorter. We do not understand some of 

 Piaget's figures. 



