376 Osten Sachen: The genns Phyllolahis O. S. (Dipl, Tip.). 



The forceps of the male is, in the main, of the same structure 

 in both species; bnt some diiferenccs are evident: On the underside 

 of the forceps of macrnra there is a conspicnous crest of stiff, 

 yellowish hairs („ein langer, dichter, goldglänzender Borstenkamm", 

 as Bergroth describes it) which does not exht in clavitjer.^) What 

 I describcd as a yellowish-white foliaceons, folded appendage 

 on the underside of the forceps of claviger, is visible in macrura 

 too, but it is niore decidedly yellovv. 



What I have given is more than suffieient for proving, beyond 

 any possible donbt, the generic identity of the Californian and of the 

 European species of Pliylloiahls. It is much to bc desired now, 

 when fresh specimens can be easily procured, to have a more detailed 

 description of this remarkable genus made, with accompanying figurcs. 

 A dissection and a comparative description of the male forcepses 

 would afford a particular interest. 



If traces of any ancient connection between the two, at present 

 very distant, areas of distribntion of Phyllolahis still exist, they 

 should be looked for in Siberia and in the Alpine regions of the 

 North West of North America. 



I have every reason to suppose (althongh, after the lapse of 

 tvventy years, I do not distinctly remember) tliat some of the State- 

 ments of my description of the genns Phyllolahis in the „Western 

 Diptera" were taken down on the spot, from living, or qnite fresh 

 specimens, bocanse that was my nsnal custom. This should be borne 

 in mind, in case some slight discrepancies bo noticed between dried 

 specimens and my data, when compared with theni. 



Addendum 



to the artic.le: On the terms Calyptrata etc. 



On p. .S32, lino (> from bottom, after the word Diptera add: 

 West wo od, Introd. II, p. 500, is likevviso of the opinion tliat the 

 sqiiamae (he cnlls thcm alnlcts) „are mere appendages of, or in 

 fact, not distinct organs from the upper wings". The halteres he 

 takes for the real analogucs of the bind wings (contrary to the 

 opinion of Latreille, Fam. Natur. 1S2,'"), p. -ISO, footnote, and 

 of Audouin). 



^) The presonce of tliis yollow crest was the principal cause of 

 my doubts about the right Identification of my genns by Bergroth. 



