Description of a new genus and species of 
Myrmeleonidae from Japan. 
By 
P. Esben-Petersen, Silkeborg. 
Thaumatoleon n. g. 
Costal crossveins simple; forked in the pterostigmatical and apical 
area; in the last mentioned area there is one series of gradate cross¬ 
veins in the forewing and two more or less irregular series in the 
hind wing. Rs arises in the forewing further out than the fork of Cui. 
C 112 , and / A run separately to the point where Cm meets with 
the first crossvein from Cm. C 112 somewhat curved; it reaches 
the hind margin at the level of the origin of Rs. 2A and 3 A 
coalesce for a distance; 2A forked. In the hindwing Rs arises 
close to the base; one crossvein before the origin of Rs. 1A 
very short. Hindwing longer than the forewing. No Banksian line. 
Tip of wings rounded in a particular manner. 
Antennae at least as long as the head and the thorax united. 
Prothorax broader than long. Abdomen siender and shorter than 
the forewings. Legs siender; tibiae longer than femora. Ist tarsal 
joint almost as long as 2nd and 3rd united; 5th as long as 2nd, 
3rd and 4th together. Spurs tiny, rather straight and as long as 
lst joint. 
Genotype: Thaumatoleon splendidus. 
It is a very interesting genus which may be looked upon as 
a highly specialized one within the Formicaleonini. At first sight 
it has somewhat likeness to one of the genera Detidroleon, Frog- 
gattisca and Glenurus. 
Thaumatoleon splendidus n. sp. 
Face yellowish brown; vertex pale brown, filled up by two 
cross-rows of narrow longitudinal furrows. Antennae brownish yel- 
