222 



REVISION OF THE F-iMlLY EUSTHEKIIDAE (OHDER PERLAnlA ) , 



During my visit to Eiif;'land, from June to August of last year, I studied 

 tbe material helongiug to this family in the British Museum, and also in the 

 Hope Museum at Oxford. There is, fortunately, in the latter Museum, a very 

 fine specimen of Diamphipnoa annulata, ot which, through the kindness of Pro- 

 fessor Poulton, 1 have received an excellent photograph. This is reproduced, 

 enlarged, in Plate xiv., fig. 8. It will be readily seen that it is a true Eustheniid 

 in every respect, thus justifying Banks' groujiing of it with Stenoperla in his 

 tribe Eustheniini, as opposed to Enderlein's placing of it in the family Pteron- 

 arcidae. 



While in Melboui'ne in April, 1920, I went through the collections of the 

 National Museum, and discovei'ed tliere a magnificent new Stonefly, quite unlike 

 anything hitherto known. It had been taken at Warburton, on the Upper 

 Yarra River, many years previously (there is no date on the label), and had 

 remained unnoticed for many years. The Curator kindly loaned me it for 

 study, and I have been able to show it to many entomologists in England and 

 America. This remarkable insect belongs to the family Euslh-eniidae, within 

 which it will be placed, in tliis pa])er, as the sole representative of a new genus 

 Tliaumatoperla, forming the only known member of a new sumfamily Th-awinato- 

 perlina,?. It is figured in Plate xi., fig. 1. 



Text-fig. 1 — Sienoperla prasina (Newuian). Traclieatiou of winga of last larval instar. 

 lA, 2A, 3A, the three anal tracheae ; Cu, cubitus; Cu], Cu2. its two main 

 branches; Inn, humeral veinlet ; M, media; 11, radius; Ri. its anterior 

 branch; Rs, its posterior branch, or radial sector; Sc, subcosta. (x 36). 



