South African Hydrachnids. 451 



of the anterior margin. On both sides are the large hair-pores, 

 placed relatively near together. 



In the one variety, E. variahilis var. magna nov. var. (fig. 10) the 

 eye-bridge is still larger, with the hind margin curved, the in- 

 cision of the front margin wider and the muscle-peg larger and 

 divided. 



In another variety, E. variabilis var. intermedia nov. var. (fig. 11), 

 the eye-plates and bridge are smaller, with the muscle-peg also 

 smaller, directed backwards and extending beyond the hind margin 

 The hair-pores are situated more towards the sides, nearer to the 

 eye-capsules. 



Maxillary Organs.— The maxillary plate (fig. 12) is very peculiar, 

 the inferior part being coalesced with the pharynx (fig. 12, ph), so 

 that it is impossible to distinguish the hinder part of the maxillary 

 plate from the pharynx. The long, posterior, maxillary processes 

 (fig. 12, pp) apparently arise from the pharynx. A similar formation 

 probably exists in E. degenerata Koenike, 1897 (22, 23), but the 

 pharynx in E. variabilis n. sp., is thin and long. The air-sacks 

 (fig. 12, Is) and the anterior maxillary processes (fig. 12, pf) are also 

 long and robust. The mouth-opening is large, with a large oral fringe 

 (fig. 12, h). 



The maxillary palps (figs. 13 and 14) are very like those of 

 E. degenerata Koen., with the fifth segment pointed. The spines 

 on the small distal process of the third segment are very long, but 

 only a few are feathered; they are 9 in number, and in addition 

 there are 3 or 4 in the middle of the segment. The fourth segment 

 possesses on the outer side (fig. 13) about 4 or 5 long ensiform 

 spines besides 6 smaller ones, and on the inner side (fig. 14) about 

 6 ensiform spines in a row and 11-12 others, about 8 of the latter 

 being feathered. The lengths of the 5 segments (reckoning from the 

 first to the fifth) are : 0-10 -f 0-16 -(- 0-18 -f- 0-28 -i- 018 mm. 



The epimera, the "anus," and the genital area with the genital 

 hairs are shown in fig. 15. 



Locality.— Kt. Purcell and Mr. Lightfoot collected about 40 ex. 

 in fresh- water ponds near Eetreat Vlei, Cape Flats (Oct., 1900) 

 (Eeg. No. 9036). 



4. EuLAis voELTZKOwi Koeuike, 1897 (22, 23). 



Locality. — Mr. Purcell collected 1 ex. in a fresh-water pond on 

 the Maitland Flats, near Cape Town (Sept., 1899) (Eeg. No. 4624), 

 and 2 ex. near Eetreat Vlei (Oct., 1900) (Eeg. No. 9037). 



