16 ARKIV FÖR ZOOLOGI. BAND 11. NIO 26. 



Heteroleon n. g. 



Wings narrow, pointed at apex. Costal area of the same 

 breadth from base to the pterostigma; none of the costal 

 crossveins forked. A few crossveins present in the apical 

 area. Bs arises further out than the fork of Cui, but before 

 end of Ci^2- The angle between Cuu and Cuiy acute. Third 

 branch from Cuia arises without the angular area. The free 

 basal part of Cwj short. 2 A and 3 A coalesce for a short 

 distance. 2 A unforked; 3 A forked. Costal area in the hind- 

 wing equally broad from base to the pterostigma. No cross- 

 veins in the costal area forked. None or very few crossveins 

 in the apical area.^ One crossvein in the radial area before 

 origin of Rs. 1 A simple. 2 A short, running parallel and 

 close to the hind margin until it coalesces with 1 A. Two rows 

 of cells between i¥2a and the hind margin. No Banksian 

 lines. Legs rather short and slender. Basal tarsal joint short, 

 as long as second and third united; second, third and fourth 

 joint very short; fifth almost as long as the four other joints 

 united. Spurs about as long as first and second tarsal joint 

 united. 



Genotype: H. exilis n. sp. 



This genus has great likeness to the European genus 

 Nelees, but it differs from that especially with regard to the 

 presence of 2 A in the hindwing. Formicaleon marginalis 

 Banks may also be included in the genus. 



Heteroleon exilis n. sp. (pl. 3, fig. 1). - Head blackish 

 brown. The lower part of the face yellowish with a short 

 brownish longitudinal band, which ends at the clypeus (in 

 the one specimen this streak is very slightly indicated). Palpi 

 yellowish. Tip of mandibles dark brown. The vertex raised 

 and with a short longitudinal median furrow in front. An- 

 tennae hardly as long as head and thorax together, strongly 

 clavate, yellowish brown, with dark tip and with the two 

 basal joints dark banded (the basal one only on its underside). 

 Prothorax as long as broad, somewhat narrowed in front and 

 with rounded front angles; greyish brown with a yellowish 

 irregular median longitudinal streak and with an irregular 



^ In the two present specimens of H. exilis is found one crossvein in 

 the apical area of the one hindwing, none in the other hindwings. 



