Mr. A. H. Haliday on new British Insects. 183 



As Mr. BelFs figure represents the front view of the animal, 

 and as no coloured representation of it of which I am aware 

 has yet appeared, the dorsal aspect has been chosen for the 

 present figure, Plate X.*, which shows the bat of half the na- 

 tural size. 



By way of conclusion to this short notice I have only to ob- 

 serve, that the various species of bats are (in this neighbourhood 

 at least) not sufficiently studied, and there is no doubt that by 

 diligent research many of those species which are now consi- 

 dered rare would be found to be comparatively common, 

 and to have been mistaken for those well-known species to 

 which the greater part of them are closely allied. 



Great Yarmouth, June, 1838. 



XXII. — New British Insects indicated in Mr. Curtisfs Guide. 

 By A. H. Haliday. 



[Continued from p, 121.] 

 DiPTEBA. 



Culex detritus, C. 1137. 9^.--Ent. Mag. i. 151. 



This seems to be the original C. pipiens of Linnaeus. The 

 insect described by Meigen under that name is a very diflfer- 

 ent species and not uncommon. 

 Bibio nigriventris, C. 1179. 4^. — Ent. Mag. i. 157. 



I have now ascertained that this is the other sex of B. al- 

 bipennis. 

 Cordylafulveola, C, 1174. 2. 



This is the other sex of C.fasciata. The sexes in this ge- 

 nus differ both in the form of their antennae and the num- 

 ber of joints, which also varies according to the species. 

 There are two minute ocelli in all that I have examined, but 

 they are easily distinguished from the Mycetophilee by the en- 

 larged basal joint of the palpi, on account of which Macquart 

 has called the genus Platy palpus •\. 



* It being our intention, as will be seen in the notice on our wrapper, to 

 give a supplement of plates at the end of our volume, we must reserve the 

 present one for that opportunity. — Edit. 



t The genus Plafypalpus is separated from Tachidromia by Macquart, 

 ' Dipteres du Nord de la France.' Plalyp. Dolichop. &c. p. 92.— E. Newman. 



