1919.] 185 



that C.servilla might be divided into a Northern (China- Japanese) and 

 a Southern (Indo-Malayan) race, the first of more considerable and the 

 second of smaller size of the abdomen and the wings. If in the future 

 no satisfactory specific distinction were found between C. servilia and 

 C. erythraea, then the latter must be considered as a third or Western 

 (European, West Asiatic, African) race of servilia. 



It may be worth repeating Kriiger's remarks on the Indian forms 

 as having a close bearing on the examples from Mesopotamia : 1st, in 

 Bengal forms occur which thoroughly resemble those from Sumatra ; 

 '^nd, here {i.e. in India) the form G. soroi' Ramb., is at home, which, 

 according to Kirby, is common in Ceylon, India, and North-west India, 

 and which Kii*by calls the Indian form of C. erythraea, Brulle ; and, 

 3rd, also the real C. erythraea, Brulle, if not in India proper, present at 

 least in Kashmir, according to Calvert, and farther away in Central 

 Asia, according to Brauer (Turkestan, Jarbasch, Taschkent), Selys 

 (Turkestan, Lob Noor, Oase Keria), and Ris (Kashgar Darja). 



Ris refers to examples from Nepaul and Assam as belonging doubt- 

 fully to O. erythraea or servilia, and he evidently regards as intermediate 

 forms Rarabur's type of C. soror and Kirby's soror from Murree and 

 Campbellpore and the same author's C reticulata, also from Campbellpore. 

 He sums up the results of his study of the C. servilia series in something 

 like the following terms. The possibility of a subdivision of this series 

 shows itself in the following way : («) the Himalaya examples {soror 

 Rambur) as a transition group to eryt^iraea ; (b) the great principal 

 group comprising Ceylon, India, Burma, Southern China, Formosa, 

 Malacca, and the Archipelago, out of which stands (c) the form from 

 Java and Lombok, distinctly marked by the reduction of the basal spot ; 

 (d) the form from Middle and Northern China {servilia typical), and 

 {e) the form from Japan, which is distinguished through its great size, 

 analogous to other insect forms from the same region. 



In his table of the species of Crocothemis Ris (Coll. Selys, p. 533) 

 separates (7. erythraea and C. servilia thus : — 



Wings relatively broader {e.g., hind wing 30, breadth at anal loop 10 nun.), 

 apex of wings of both sexes normally hyalin«. Abdomen of the (S scarlet-red, 

 of the 2 yellowish brown; without dark markiugs in the J, exceptionally 

 with dark dorsal carina of segments 7-9 in the $ C. erythraea. 



Wings relatively narrower (e. //., hind wing 31, breadth at anal loop 

 9-5 mm.), apex of wings of S narrowly and of the 5 mostly more broadly 

 margined with brown. Abdomen of the d" red, of the $ yellowish brown ; 

 dorsal carina, at least on segments 8-9, mostly even further forward, darkened 

 with brown or blackish, more strongly in the $ ihau in the J .... C servilia. 



