24 Mr. H. Campion on Dragonflies jrom 



successive stages of reduction, due to the progressive cutting 

 off of their posterior portion. Thus, in the first specimen 

 the lines are about three-quarters of their full lengthy in 

 another little more than half, while in the third individual 

 they are represented by mere vestiges on the anterior portion 

 of tlie meso-metathorax. The .twenty -three specimens of 

 /. senegalensis contained in the collection may be analysed 

 thus : — 



Males :— 



Pale anteliumeral lines complete 1. 



Pale anteliumeral lines reduced 3. 



Pale anteliumeral lines obsolete 8. 



Females : — 



Homoeochromatic 1. 



Heterocliromatic, 



Orange stage 7. 



Olivaceous stage 3. 



The single female of Tramea limbata in the collection 

 agrees very well in its wing-markings with the female 

 obtained from the same island by Gulliver. 



As regards Orthetrum brachiale, of which there are two 

 males and a female, it may be observed that the species has 

 been recorded from Mauritius, but not otherwise from Rodri- 

 guez. One of the males is teneral, but the other specimens 

 agree with it in having the anal appendages quite white. I 

 have seen a long series of this species from various parts of 

 Continental Africa, and found that the anal appendages, in 

 males and females alike, are usually black. Ris, however, 

 describes the appendages of both sexes as being normally 

 bright yellow, while in \erj adult examples only are they 

 dark and pruinose (Coll. Selys, Libell. p. 200, 1909). The 

 hamules of the two males, and especially those of the fully 

 matured specimen, are very similar to what Ris has figured 

 from a Nossi Be example (loc. cit. fig. 140). 



Cocos-Keeltng. 



The dragonflies collected in April and May 1906 by 

 Dr. F. Wood Jones are of unusual interest, inasmuch 

 as "none of these species is resident on the atoll, and there 

 is no open fresh water for them to pass their early stages in. 

 All are wind-borne waifs, and do not belong properly to the 

 fauna of the islands, although they are at times so con- 

 spicuous a feature of it" (Wood Jones, Proc. Zool. Soc. 

 Lond. 1909, p. 155). 'i'he specimens were presented to the 

 l^ritish Museum (Natural History), and were identified by 

 Mr. W. F. Kirby as belonging to Pmiiala Jlavescens, Fabr,, 



