1901 ] 



163 



/ 



luniration blackisli. 



A)ipciidages formed 



much after the same 



plan as in D.Muelleri , 



bnt differing tliere- 



froni. Superior ap- 

 pendages much dih\- 



ted at tlie base if 



viewed laterally, and 



then narrowed into 



a short finger-shaped 

 pi'ocess, which is turned down ; this process is 

 much shorter than in Z). Muelleri. Intermediate 

 appendages not very clear, apparently short, broad, approximate, and curved 

 upwards. Inferior appendages somewhat as in D. Muelleri, but broader and less 

 widely divergent. 



Length of body, 9 mm. Expanse of wings, 26 mm. 



Rah. : Switzerland (Locarno), April (Jtli, 1899, one ^ i^>'- ^- ^• 

 Cliapman) in my collection. 



It would be useless to draw a comparison witli the other black 

 species {nigrescens and meJanchcetes'), because these differ' widely in 

 their anal structure, whereas with Muelleri there is apparently real 

 affinity and at the same time quite sufficient specific differences. 

 Amongst other species there is slight analogy with D. alpinus. 



It may be that D. OJinpmani is an early species ; few entomolo- 

 gists have begun alpine collecting so soon as the first week in April ; 

 and it may also be that it is peculiar to the warm trans-alpine district 

 in Switzerland and the adjoining parts of North Italy. 



EXPLANATION OF FIGURES. 

 Fig. 1, apex of abdomen of c? from above (not quite even). 

 Fig. 2, same from side. 



Lewisham, London : 



June 9th, 1901. 



NOTES ON CERTAIN PAL.EARCTIC SPECIES OP THE GENUS 

 HEMER0BIU8: H. CONCINNUS, AND ITS var. QUADRIFASCIATUS. 



BY KENNETH J. MORTON, F.E.S. 



Some time ago, when working in conjunction with Mr. McLachlan 

 on the genus Hemerobms, 1 had occasion to examine niinutely //. 

 concinnus and its so-called var. quadrifasciatus. The latter form, 

 although very abundantly different in facies from the typical con- 

 cinnus, had remained without a distinctive name until 1S9-1', when 

 Reuter applied to it the term (£uuclrifasciatus. 



