220 



Mr. R. MacLachlan's Monograph of 



both sexes ; though it is difficult to imagine by what 

 structural characters the insect is enabled to effect the 

 jumps. The male seems to be much more rare than the 

 female. 



Hagen (Ent. Mo. Mag. iii. 132) indicates the British 

 insect as distinct from that of Linne, under the name of 

 B. Weshvoodii, giving as differentiating characters the 

 pale colour of the legs, rostrum, etc., and the slightly 

 grooved apex of the ventral valve in the c? • ^ have 

 been unable to identify B. Westwoodn, never having seen 

 a ,^ , either British or continental, presenting the above- 

 noted structural character in the ventral valve ; and so, 

 for the present, I feel compelled to consider our species 

 as that of Linne, not having been able to examine more 

 than three or four males. At the same time, I remark 

 that Dr. Hagen's well-known powers of discrimination 

 render it very probable that two European species really 

 exist. 



Synonymic Catalogue of British Planipennia. 



Div. I. SIALINA. 



Fam. I. SIALID^. 

 Gen. i. Sialis, Lat. 



Sp. 1. iS. lutaria, Linn. 



flavilatera, Linn.?. 

 niger, Lat. 



Sp. 2. S. fuliginosa, Pict. 



Fam. II. EAPHIDIIDiE. 



Gen. i. Eaphidia, Linn. 



Sp. 1. R. notata. Fab. 



ophiopsis, Curt. 

 megacephala, Steph. 

 media, Burm. 

 cmgustata, Eatz. 



Sp. 2. B. xamtho stigma, Sclium. 

 Londinensis, Steph. 



Sp. 3. R. cognata, Eamb. 



Sp. 4. R. marAvlicollis, Stepb. 

 affinifs, Stepb. 

 hispanica, Eamb. 



Div. II. HEMEEOBIINA. 



Fam. I. HEMEEOBIIDJC. 



Gen. i. Osmylus, Lat. 



Sp. 1. 0. fulvicephalus, Scoi?. 

 maculatus. Fab. 

 chrysops, Auct. {nee 



Linn.) 

 law'ifolia'formis, Eaz. 



Gen. ii. 

 Sp. 1. 



Sp. 2. 



Sp. 3. 

 Gen. iii. 



Sp. L 

 Gen. iv. 



Sp. 1. 



SiSYRA, Bitrm. 

 S. fiiscata. Fab. 



confinis, Stepb. 



nitiduhhs, Stepb. 



nigripennis, Wesm. 



fumatus, Mots. 



S. DaUi, M'Lach. 

 nitiditlus, Walk. 



S. terminalis. Curt. 

 PSECTRA, Hag. 

 p. diptera, Burm. 

 MiCROMUs, Eamb. 

 M. variegatus. Fab. 



