270 

 4. Data relating to Siberian Dragonflies. 



By A. Bai'tenef (Warshaw, Russia]. 



(With 7 figures.) 



1. 



Dragonflies collected by S. Chugunof in the region of Oby- 

 Enissei canal (Narymski district Tomsk government). 



1) Leptetrum quadrimaculatum L.; q'. 



2) Leucorrhinia dubia var. tschugunovi var. n. 



Q: This variety differs from Leiicor. dubia Lind., typ., in the 

 following respects: The base and the spots at the sides of the upper lip 

 are yellow. The frontal tubercle (vesicula verticalis) is black without 

 spots. The triangle of the occiput (cuneus) is marked with a yellow spot 

 in the hinder part, The thorax between the wings is yellow. The yellow 

 spots of the 2'^ and 3' segments of the abdomen are smaller than those 

 of Lene, dubia. In addition to the black spots found at the base of the 

 fore and hind wings of Leuc. dubia there are also at the base of both 

 pairs of wings a black stripe between the subcostal nervure (costal nervure 

 Kirby) and the principal radius (subcostal nervure Kirby) and at the 

 base of the fore wings a black stripe on the lower basal cell occupying 

 all the basal half of cell to the first cross nervure. All the spots on the 

 wings are surrounded with a sharply defined fringe of saffron colour. The 

 body is smaller: length of the abdomen — 23 mm, length of the hind 

 wing — 24 mm; pterostigma — 2 — 2,25 mm. Four Q. The male is 

 unknown. 



3) Sympetrum flai'eolumJj.\ Ç. 



4) Somatochlora gratiosa sp. n. (fig. 1 and 2'. 



2 2 : The colour of the body is dark bronze. The labium, rhinarium, 

 a triangular spot beside each eye, the middle line and hinder margin of 

 the anterior surface of the thorax (devant du thorax Selys), the hinder 

 margin of the 1^* segment of the abdomen, the cross stripe on 2'^' segment- 

 broken in the centre and turning upward at the sides to the margin of 

 the first segment, all the anterior margin, a large oval spot on each side 

 of the anterior half of the 3'^ segment, the under surface of the abdomen 

 and vulvar lamina — are yellow. The vulvar scale (lamina) is not 

 notched, a little raised and blunt at the end, in length from 2/3 to "Y4 of 

 the 9^'' segment. The 9"' and 10"' segments together are equal to the 

 8*''. Anal appendages are longer than 9"' and 10"' together. The ab- 

 domen does not narrow in the 3'' segment. The legs are black. The 

 wings transparent, a little dingy between the nodus and the apex of 

 the wings. Plerostigma is light brown. The membranule is white. Fore 



