NOTES ON OEIENTAL DRAGONFLIES OF THE GENUS 



ACIAGRION.i 



By Frank Fortescue Laidlaw, 

 of Uffculme, England. 



INTRODUCTION. 



In accordance with the hope I entertain of completing, some day, 

 a survey of the Oriental Odonata fauna, I have contributed in 

 this paper an account of the genus AciagHon to be followed, I trust, 

 in due course by similar accounts of other genera of the Coena- 

 grioninae.2 As no monogi-aphic revision of this subfamily has as yet 

 appeared, it seems advisable to deal with the genera of the subfamily 

 in more detail than is necessary, for example, in the case of the 

 Libellulinae. As the systematic arrangement of the Coenagrioninae 

 is still largely unsettled the method of dealing with it, genus by genus, 

 has considerable advantages, since by a careful examination of the 

 evidence available it should be possible to obtain some data of use 

 to those who will undertake the task of constructing a natural classi- 

 fication of the subfamily which should have some right to be con- 

 sidered final. 



Genus ACIAGRION de Selys. 



Aciagrion de Selys, Ami. Mns. Civico di Geuova, vol. 30, p. 159 (pp. 77-79 

 of separate). Type of genus.— Ada [/rion Msopa de Selys. 

 The genus includes a number of small, delicate insects, and ranges, 

 so far as known at present, from Ceylon and South India to Ihe 

 East Himalayas, thence through Assam and Burma down the Malay 

 Peninsula to Borneo, whilst an outlying species is recorded by Till- 

 yard from Australia. 



^ Tins js the fourth of a series of papers,, the first and second of which hy E B 

 Williamson, of Bluffton, Ind., were on The Dragonflies (Odonata) of Burma and Lower 

 biam, as follows: 1. Subfamily CalopteiTginae, Proc. U. S. Nat. Mus vol '^S pp 

 16.3-187, published April 22, 1905. 2. Subfamilies Cordulegasterinae,. Chlorogomph'inae 

 and Gomphinae, Proc. U. S. Nat. Mus., vol. 33, pp. 267-317, published December 13, 1907 



i he third paper in the series, by Frank Fortescue Laidlaw, of Uffculme, Em^land car- 

 rying the same general title of The Dragonflies (Odonata) of Burma and L<,wer Siam— III 

 was on the Subtamily Aeschninae and was published in the Proc. U. S. Nat. Mus vol 62* 

 pp. 1-J9, pi. 1, and was issued on June 21, 1923. ' " ' 



voI?rpp!'2?-2?T9X^'''° '^^"'*'' °^ '^^ ^^^^'" ^ K^"°edy' Oliio. Journal of Science, 



No. 2547.— PROCEEDINGS U. S. National Museum, Vol. 66, Art 10 



100461—24 1 



