80 



Annals of the Teansvaal Museum. 



wide, other articles as long as wide, article IV conical ; long liairs on 

 outer and distal margins of all articles, terminal tiift of liairs on 

 article IV. Legs slender and very long, pair IV longest; Coxae 

 elongate, removed from median line, pairs II, III, and IV contiguous, 

 pair I removed anteriorly ; article I longer than wide, other articles 

 all very long and slender ; tarsi gradually attenuated at tips ; all 

 articles with numerous whitish liairs ; claws very long and slender. 



Male (/, /). — Hesembles the female except for the following 

 points: much smaller, 5.5 mm. wide by 5.5 mm. long; somewhat 

 narrower in front than behind, but lacks the conical anterior pro- 

 longation of the female ; integument with papillae not so strongly 

 formed ; a pair of large pits on the dorsal surface on each side of the 

 median line at aliout the anterior third of the length, in front of 

 these another pair of pits, further removed from the median line, 

 with a third pair still further anteriorly and more widely separated, 

 behind the first-mentioned pair another pair of pits, more widely 

 separated ; numerous radiating rows of pits as in female ; anus with 

 eight long spines on each valve, close to the anal ring ; genital pore 

 short transversely, opposite Coxae I ; deep coxal grooves ; mandibles 

 (//, r) short and thick, process of outer apophysis bideiitate and 

 attached low down, outer apophysis bideiitate; hypostome (//, o) 

 Avitli three roAvs of small teeth on each side at tip, first row consisting 

 <of two teeth, other rows of four teeth each, then a row of three larger 

 teeth, followed by a row of two very large teeth each. Legs shorter 

 and stouter than in female ; pairs I and IV longest ; Coxae contiguous ; 

 article I as wide as long or about so ; other articles much longer than 

 wide ; claws of tarsi shorter than those of female. 



Nympli (7, n). — Body almost circular, may reach 2.4 mm. long 

 by 2.1 mm. wide, narrowly rounded anteriorly, which acts as a hood 

 in covering the rostrum. Integument marked with fine zigzag folds 

 on young individuals, but with papillae on those which are older; on 

 each surface a border, formed of irregular folds on young individuals, 

 elongate quadrangular plates on those more mature, narrower 

 anteriorly, plates bearing very short hairs, irregularly disposed. 

 Arrangement of pits on dorsal and ventral surface as in the 

 male ; other characters like those of male except as follows : anus with 

 five spines on each valve ; deep transverse groove immediately 

 posterior to the anus ; the extremities of the rostrum often appear 

 beyond the anterior edge of the body ; process of inner apophysis and 

 outer apophysis inserted very anteriorly, otherwise resembles those 

 of the male; hypostome (//, u) provided on each half with two 

 longitudinal rows of five or six strong teeth each ; two long hairs at 

 the base of the rostrum, near the median line, two others shorter, 

 more posterior, and more widely separated, on the prolonged axes of 

 the palpi. 



Larva. — Body short, oval, truncate in front; 1.3 to 2 mm. long 

 by 1 to 1.5 mm. wide; colour varying from light dirty yellow co 

 reddish, deeper in centre, bluish when engorged; legs lighter in 

 colour ; flat, w4tli the margin and the centre of the dorsal surface 

 raised ; ten radiating grooves in the posterior half of the dorsal 

 surface and a somewhat larger number in the corresponding part of 

 the ventral surface. Integuinenf marked with fine folds, parallel, 

 transverse, a little undulating. On each side of the dorsal surj'aee 

 three hairs, distributed symmetrically in the anterior half ; twenty 



