Hypocera. 173 



with bristles as in flavitnana, but the lower anterior bristle on middle 

 tibiæ quite minute and placed at the apex, and hind tibiæ with fewer 

 (only two) apical spurs and further front tibiæ with no dorsal apical 

 spur; hind tibiæ shaped as in flavimana. Wings only slightly greyish 

 yellow, veins brown; costa reaching to the middle, 1 about equal to 

 2 (2 + 3); costal cilia a little longer than in flavimana; third vein 

 forked, but the anterior branch very thin, the fork longish; the third 

 vein has at apex a little elongated swelling, and it has fine hairs in 



Fig. 64. Wing of H . irregularis (^ . 



the whole length; foiirth vein strongly curved in its first part, for the 

 rest straight, that and the fifth vein rather diverging. H alteres black. 



Female. Quite similar, only clypeus slightly more distinct, and 

 the apical swelling of third vein a little more pronounced. 



Length 2,7 — 3,5 mm. 



As seen this species is nearly related to and very similar to 

 flavimana, but it is distinguished with certainty especially by the 

 forked third vein, the broader and duller frons, the quite dull and 

 more hairy abdomen, the shorter first costal division, and the lower 

 bristle on middle tibiæ being minute and placed at the apex, and 

 fmally also by the want of a dorsal apical spur on front tibiæ. Wood 

 says that there is no lower bristle on middle tibiæ, he has, I think, 

 not reckoned this very small one. At present there are known in all 

 seven specimens of the species, including three females which sex 

 was not known hitherto; all seven specimens show the thin, but distinct 

 anterior branch of the fork. 



H. irregularis is rare in Denmark, I have taken in all five spec- 

 imens, two males and three females, in Geel Skov on ^U — ^^/lo in 1918 

 to 1921; they were taken on leaves in a plantation of young syca- 

 mores; on '/lo a pair was taken in copula. 



Geographical distribution: — Besides from Denmark the species 

 is only known from England, where two males have been taken by 

 Wood. 



