1898.] 



NATURAL SCIENCES OF PHILADELPHIA. 



147 



elevation above or below which they were collected. The U. S. Na- 

 tional Museum does not possess any more precise data, which is the 

 more unfortunate as such exist for the mammals and birds collected 

 in this region by Dr. Abbott, and may be found in the papers by 

 Messrs. True and Richmond respectively, in the Proceedings of the 

 U. S. National Museum, volumes XVII and XVIII. 



Of the fifteen species ten are well-known as occurring in Europe 

 and a large part of Northern and western Asia, three (Ischnura in- 

 armata n. sp., Orthetrum hyalinum, 0. triangulare) are Indian in 

 their relationships, one is the cosmopolitan Pantala flavescens and 

 one (Ophiogomphus reductus n. sp.) is allied to Palsearctic species of 

 a Holarctic genus. 



Subfamily AGRIONIN-ffi. 



1. Lestes barbarus Fabr. 



One female " below 5,000 f." It differs from European examples 

 only by its slightly shorter pterostigma. 



This species has previously been recorded from Persia and Turk- 

 estan. 



2. Isohnura inarmata n. sp. Figs. 1, 2. 



Two males, three females, ," below 5,000 f." 



Abdomen $ 23-22, 9 22. Hind wing $ 16-15, 9 16-18. 



Agree in many respects with de Selys' description of /. delicata 



Fig. 1. Fig. 2. 



Fig. 1. Profile view, right side of tenth abdominal segment and the term- 

 inal appendages of Ischnura inarmata n. sp. S Fig. 2. The same, viewed 

 obliquely from above and behind. RS right superior appendage, LS left super- 

 ior appendage, RI right inferior appendage, LI left inferior appendage, P in- 

 ferior process of the superior appendage. The irregular, curved line on the 

 side of the tenth segment in figure 1 indicates the boundary between black 

 above and blue below. 5 x 20. 



5 All the drawings which illustrate this paper have been made with the aid 

 of Leitz or Zeiss lenses and the camera lucida. 



