GENERAL INDEX 263 



Wagenboom 149 Witteboom 145 



Water cress 239 Wonderboom 135, 136, PI. 26 



Water ferns 76 Wood-flowers 168, PI. 39 



Waterkers 239 



Water lily 217 Yeast, home made 210 



Water net 10 Yellow weed 244 



Wax berry 133 Yellow wood 101 



Weevils 96, 99 Yew 103 



Weld 244 



Welwitschia 1 1 1 Zamieae 92 



Whitlow grass 239 Zampion 23 



Wild almond 141, 158 Zoospores 9 



Wild fig 136 Zuring, steenbok 181 



Wild lemon 230 Zuurvijg 204 



Wild plum 165 Zwartstorm 238 



Wilgeboom 130 Zygomycetes 24 



Willow 130 Zygospores 11 



Window leaves 207 Zygote 9 



Witstam 234 



ADDENDA. 



I. To page 96, third paragraph : 



The reference to Dr Rattray's observations was based on a resume 

 of his paper submitted at the meeting of the Royal Society of South Africa on 

 April 1 6th, 19 13. The paper* has now been published in full, and on reading 

 it we find that, although the name of the insect observed by the author on the 

 flowers of Encephalartos Altensteinii and E. villosus is given as Phloeophagus 

 hispidus [Cossoninae], the description shows that it is Andiarhinus zamiae 

 (Plate 15) [Antliarhinae]. This simplifies the position very much. 



The evidence for the entomophilous nature of these Cycadaceae conse- 

 quently stands as follows : 



1. Phloeophagus" hispidus and P. ebeninus were collected by Miss Pegler 

 on $ plants of E. villosus, and Prof. Pearson thought it not unlikely that these 

 weevils were concerned in the transport of the pollen to the % cones. 

 (H. H. W. Pearson, Trans. S.A. Phil. Soc. xvi, 348 (1906).) 



2. Derelomus languidus was subsequently collected by Miss Pegler on 

 both sexes of E. villosus. (See page 96.) 



3. Andiarhinus zamiae, which regularly infests the seeds of both species 

 (see pages 96 and 99), was observed by Rattray in large numbers ($ and $) 

 on the male cones of both species, and the female insect a few days later 

 within the $ cones in the open spaces between the ovules. 



4. The same insect, called at that time Curculio zamiae, was found by 

 Thunberg (1773) in the seeds of E. caffer (Thunb. Flora Cap. p. 430). 



It is therefore obvious that, although Antliarhinus destroys a good many 

 seeds of these Cycadaceae, their pollination principally depends upon its 

 presence. The case is quite similar to that of the Yucca-moth (Pronuba). 



* G. Rattray, Notes on the pollination of some S. A. Cycads. Trans. Roy. Soc. 

 South Africa. Vol. in, 259 (191 3). 



