San Thome J Rodr'ujriez^ c^'x. 23 



1919-1921, consisted of six species, particulars of wliicli arc 

 subjoined : — 



Ceriagrion glahrum^ Burm., 2 rj" , 1 9 . 

 Orthetrimi stemmak capense, Calv., 1 J , 1 9 . 

 0. gidnecnse, Ris, 1 ? . 

 Diplacodes lefehvrei, llamb., 2 c^ . 

 Palpoplenra lucia, Druiy, 5 J", 3 ? . 

 Parita/a JIavescens, Fabr., 2 S' . 



Rodriguez. 



According to Mr. Frederick Smith (Pliil. Trans. R. Soc. 

 clxviii,, extra volume, p. 539^ 1879), Mr. George Gulliver, 

 who was attached to the Transit of Venus Expedition which 

 visited Rodriguez in 1874-, brought home some Odonata 

 belonging to the three species, Libellula 77iauriliana, Ramb. 

 (=Tra77iea li?nbata, Desj., b), Anax mawitianus, liamb. 

 { = Anaoc imperator mauricianus, Ramb.), and Agrion ftrru- 

 gineum^ Ramb. (= Cer'iagrion glabrum, Burm.). I am 

 unable, however, to trace in the British Museum the single 

 specimen of C. glabrum referred to by Smith under the name 

 of Agrion ferrugineum, although I have found, a male of 

 Ischnnra senegaiensis^ Ramb., which he did not record. 



In 1918 (August to November) Mr. H. P. Thomasset and 

 Mr. PI. J. Snell collected a few more dragonflies in 

 Rodriguez, which were identified by Mr. W. H. T. Tams as 

 Pantala fiavescens^ Fabr., Tramea limbata, Desj., Orthetrum 

 brachiale, Beau v., Anax imperator mauricianus , Ramb., Isch- 

 nura senegalensis, Ramb., and Agrion ferrugineum, Ramb. 

 (Proc. Cambridge Phil. Soc. xix. p. 289, 1920). These 

 specimens have passed into the possession of the University 

 Museum of Zoology, Cambridge, and Dr. Hugh Scott has 

 been good enough to allow me to examine them. 



The only rectifications which are needed in Mr. Tams^s 

 identifications concern what he calls Agrion ferrugineum, a 

 name which should now be deleted, from his list. The 

 majority of the insects to which he has applied it prove to 

 be examples of the orange stage of the heterochromatic 

 female of IscJiniira senegalensis. The series also includes a 

 single female, in somewhat teneral condition, of a species of 

 Argiocnemis which is not known to me, and which is smaller 

 than the widely-distributed A. rubescens, Selys, and other- 

 wise different from it. The Rodriguez males of /. senegalensis 

 exhibit a peculiarity in the coloration of the meso-meta- 

 thorax, as most of them have the pale antehumeral lines 

 entirelv obsolete. Three have the antehumeral lines ni 



