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XX. Descriptions of two tiew genera, and new species of 

 Mymaridae from Tasmania. By Chas. 0. 

 Waterhouse, I.S.O., F.E.S., ivith illustrations 

 from photographs by F. Enock, F.L.S., F.E.S. 



[Read November 18th, 1914.] 



Plates XCII. 



The specimens which are the subject of this paper were 

 collected on Mount Wellington, South Tasmania, in the 

 spring of last year by Mr. R. E. Turner. They were found 

 at the high altitude of 2,300 feet. Although there are only 

 eight specimens, there are four species which are divided 

 between two new genera. The one for which I propose 

 the name Selenaeus is remarkable for the great length of 

 the ovipositor, the projecting part of which is 'as long as 

 the whole insect. The other three species are closely 

 alHed to the genus Polynema, but differ in having a very 

 fine vein running for some distance close to the front 

 margin of the wing; the thickened basal vein is slightly 

 elongate, whereas it is punctiform in Polynema. The 

 three species are of great interest as showing three degrees 

 in the development of the vein. In one species the fine 

 vein is distinctly emitted as a branch from the thick basal 

 vein. In the second the fine vein is quite distinct, but it 

 is separated from the thick vein by a slight interval. In 

 the third species the vein is so fine and so close to the 

 front margin that it is seen with difficulty. Fortunately 

 of two of the species there are two specimens, so that one 

 can feel quite certain that these differences are not indi- 

 vidual peculiarities. The wings of the species are of 

 different shapes. Mr. Turner thinks that these species 

 may be associated with some Homopterous galls which 

 were very abundant where they were taken. 



Selenaeus, gen. nov. 



Antennae eleven -jointed (including the club which consists of 

 three joints), the third extremely short. Front wings ample, the 

 front margin of the apical portion arched, the posterior margin 

 rather straight; the vein linear, extending a little beyond the 



TRANS. ENT. SOC. LOND. 1914. — PARTS III, IV. (FEB.) 



