ABT. 17 A NEW DRAGON FLY FROM SIAM LAIDLAW 3 



Female. — Very similar in appearance to the male. The dark color 

 patches on the hind wing decidedly less extensive than in the male. 

 The hinder patch is circular rather than oval in outline, and has a 

 diameter of about 3-4 cells. 



Other differences are as follows: On the head the vesicle of the 

 frons is without any red tinge. The general color of the synthorax 

 and abdomen is duller. Segments 3-7 have an apical dorsal mark of 

 black, the black band on the dorsum of 8-9 is broader than in the 

 male, and 10 has a very narrow basal ring of black. As in the male 

 the black markings on the abdominal segment have a slightly metal- 

 lic gloss. 



Genital appendages. — The genital structures agree more closely with 

 those of signata than with the African species. The appendages of 

 the second abdominal segment of the male are very similar to those 

 of Indian specimens of signata. The hamule is moderately broad 

 and very slightly longer than the lobus. Similarly the valvulae 

 vulvae of the female are almost exactly like those of the specimen from 

 Calcutta figured by Dr. F. Ris in his monograph,' the only differ- 

 ence being that in ahhotti the valvulae are a little longer, equaling in 

 length the ninth segment. 



A comparison with the other species of the genus suggests that in 

 venation the species is rather nearer to the African species than to 

 signata, the only other Asiatic species, whilst in other respects ahhotti 

 resembles its Asiatic congener rather than the African forms. It is, 

 however, amply distinct from them all. 



I have seen a much damaged example of ahhotti from Singapore 

 amongst material sent to me by Mr. Moulton. The range of the 

 species would appear to be the west coast of the Malaj'^ Peninsula. 

 One may surmise that it is an inhabitant of the mangrove swamps 

 which form so conspicuous a feature of that coast. 



The terms employed in discussing the venation of the species are 

 those used by Dr. F. Ris in the Selysian monograph.' For the wing 

 photo of the holotype I am indebted to Mr. F. W. Campion. 



Lastly, it gives me much pleasure to associate this fine new species 

 with the name of Dr. W. L. Abbott, by whom it was collected. 



Type, allotype, and paratype. — Cat. No. 50247, U.S.N. M. 



'Catalogue Systfimatique et Descrlpt. Collections Zoologiques du Baron Edm. de Selys-Longchamps, 

 fasc. k-ivi, LibelluHnae par Dr. F. Risj 



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