—2 3 — 



Mr. R. M'Lachlan in Trans. Ent. Soc. 1868, in his monograph of 

 the British Planipennia described the male out of the collection of Mr. 

 Dale p. 170 and figured it on pi. IX. He has first pointed out the generic 

 characters. 



In Ent. M. Mag. 1879, P- 95- M'Lachlan records a short winged 

 specimen (now in his collection) from Strasbourg, collected by Mr. F. 

 Reiber. He had seen a specimen from Holland, sent by Mr. H. Albarda, 

 with developed hind wings, in which the abdominal formation did not 

 appear to differ from that of the dipterous specimens. Thus, he re- 

 marks, the following problems remain to be solved: 1, are the dipterous 

 and complete individuals of opposite sexes, and ifso which are males and 

 which females? 2, has the same sex occasionally developed hind wings, 

 although usually dipterous? 3, do the two forms pertain to distinct 

 species? 



In C. R. Soc. Ent. Belg. 1882, No. 17, p. 77, M'Lachlan records 

 a dipterous specimen in the Museum R. at Bruxelles from Pavia by Mr. 

 Bertolini. The species was not before known from Italy. 



Pastor Wallengren in his Skandinaviens Neuroptera Planipennia, 

 Kgl. Svenska Vet. Ak. Handl., T. IX, No. 8, 1 87 1, gives a very full 

 account of the genus and the species. He could compare 3 specimens, 

 male and female, and collected by himself in July near Earhuld, N. W. 

 Scone, and 2 in the Stockholm Museum collected near this city by Prof. 

 Boheman. The female is here first described. The author could not 

 make a study of the genitals and accepts the common view that the 

 dipterous specimens are males. His descriptions are very detailed and 

 excellent. 



Mr. H. Albarda, Tijdschr. v. Ent. Vol. XVII, 1874, Versl. p. 15 

 to 19, gives a full account of all published on H. dipterus. He could 

 study 4 specimens, 3 males and 1 female. Two males collected 'by Mr. 

 Six in Driebergen, Holland, (recorded as long ago as 1858 in the same 

 hr. Vol. I, Versl. p. 12 and 39) now in the Museum in Leyden; 

 one collected by Mr. Evarts in Salzbourg, Austria and one collected by 

 Dr. van Hasset near Utrecht. The two last specimens are now in Mr. 

 Albarda's collection. The specimen from Utrecht has well developed 

 hind wings and agrees perfectly with Mr. Wallengren's description. Mr. 

 Albarda believes (I think his magnified figures are not published) that 

 two forms exist, and that all four specimens seen by him are females. 

 The specimen with well developed hind wings has the fore wings longer, 

 and the transversals placed differently; he could not find in the dipterous 

 specimens the hooked anal appendages so remarkable for Hemerobius. 



This, as far as I know, is all that is published on //. diplcrus from 

 Europe. There are 20 specimens present in collections, of which I 



