P. ESBEN-PETERSEN, NEUROPTERA AND MECOPTERA. 19 



All the crossveins before pterostigma in the costal area are 

 simple; in the apical area they are forked. One row of cross- 

 veins in the apical area of the forewing, none in the hind- 

 wing. Rs arises in the forewing further out than the level 

 of fork of Cu^. Anterior Banksian line not present. The 

 angle between Cuig, and Cu\^ very acute. Posterior Banksian 

 line present and very distinct; one row of cells between C^ia 

 and the Banksian line. About five crossveins before the 

 origin of Bs in the hindwing. Anterior Banksian line absent, 

 posterior line present and very distinct; one row of cells 

 between 3/2a and this line. Ciu forked. 1 A present and 

 unforked; 2 A coalesces with the hind margin, which is 

 thickened. A crossvein between 1 A and the hind margin 

 {2 A). 



Geno-type is the below described species. 



Leptoleon regularis n. sp. (pl. 3, fig. 3). — Head blackish 

 brown with a narrow yellowish lateral streak along the margin 

 of eyes in front and behind. Labrum and clypeus yellowish. 

 Labial and maxillary palpi yellowish brown; apical joinfc of 

 labial palpi almost black. Face shining brown. Vertex raised, 

 not glossy, with shining blackish streaks and spöts. An- 

 tennae strongly clavate, påle brown and with darker annu- 

 lations; base of first joint yellowish. Prothorax aboiit twice 

 as broad as long, dull brown, with paler front and lateral 

 margins and with rounded front angles. Meso- and meta- 

 thorax brownish black with yellowish hind margin. Abdomen 

 blackish with short påle hairs. Legs short and stout, with 

 blackish bristles. Front femora and tibiae blackish brown, 

 dorsally yellowish with a longitudinal brown streak. Inter- 

 mediate and hind femora blackish brown with yellowish tip; 

 intermediate and hind tibiae blackish brown ventrally, yel- 

 lowish dorsally. Tarsal joints yellowish with dark apex. 

 Spurs almost straight; each pair unequal in length. The 

 inner spur of the före legs as long as the two first tarsal 

 joints united; the inner spur of the intermediate legs hardly 

 as long as the first and the second joint together; the outer 

 spur of hind legs as long as the first tarsal joint. Membrane 

 of wings hyaline. Nervures påle yellowish, strongly dark 

 banded. Se, R and Gu^ in the forewing are very conspicuous; 

 in the hindwing only Se and R. Pterostigma not very di- 



