THE DRAGONFLIES (ODONATA) OF BURMA AND LOWER 

 SIAM.— I. SUBFAMILY CALOPTERYGIN^E. 



B}^ Edward Bruce Williamson. 



Of Bluffton, Indiana. 



This series of papers is based on three collections: First, a collection 

 belonoing to the United States National Museum made In' Dr. W. L. 

 Abbott in Lower Siam; second, a collection owned b}" the Philadel- 

 phia Academy of Natural Sciences made by Mrs. A. V. B. Crunil), 

 presumabl}' in the vicinity of Toungu, Burma; and third, a collection 

 made for me by Mr. R. A. Earnshaw in the Karenni and Toungu 

 districts, Burma. Mr. Earnshaw writes that his specimens were 

 mostly taken along- mountain streams and at elevations of from 4,000 

 to (3,000 feet. In the future I hope to receive from Mr. Earnshaw 

 some notes on seasonal distribution of the dragonflies of these districts 

 for publication in this series of papers. 



The first two collections mentioned above I have received for stud>' at 

 the suggestion of Dr. Philip P. Calvert, to whom the Siamese collec- 

 tion had already been loaned, tiiis loan being transferred to myself. 

 I am indebted in the preparation of this paper to Prof. James G. 

 Needham, in Tphose laboratory and under whose direction the wing 

 photographs, reproduced in this article, were made from material taken 

 from the collections before me. 



The purpose of this study is twofold: First, to identify and record 

 the species in the three collections, offering such notes as may sug- 

 gest themselves and describing any forms that appear to be unknown. 

 The bibliographical references to ])e found in Kirby's Catalogue" and 

 in more recent papers, especially Kriiger's Odonaten von Sumatra^ 

 and papers )>y Laidlaw on dragontlies of the Malay Peninsula,'' make 



« A Synonymic Catalogue of Neuroptera Odonata, or Dragonflies. With an Appen- 

 dix of Fossil Species. By W. F. Kirby. London, Gurney & Jackson. 1890. 



^Stett. Ent. Zeit., LIX, 1898, pp. 64-139, 267-3.31; LX, 1899, pp. 321-:W8; LXIII, 

 1902, pp. 58-193; LXIV, 1903, pp. 248, 292. 



''On a collection of dragonflies made by the Skeat expedition in the INIalay Penin- 

 sula in 1899-1900, by F. F. Laidlaw. Proc. Zool. Soc. London, 1902, L PP- 6:^)2, 

 pis. V, VI ; II, pp. 381-389; Fasciculi Malayenses, Zoology I, 1903, pp. 189-200. 



Proceedings U. S. National Museum, Vol. XXVIII-No. 1389. 



165 



