DICRANOMYIA. 59 



1829, for the species D. hdea, inusta, modesta, dumetorum, 

 didyma, etc. In Haliday's Catalogue of Diptera occurring 

 about Holy wood, Devonshire {Entomol. Magaz. I, 141) in 1833, 

 the same generic name is introduced for the species lutea, inusta, 

 modesta, chorea, and oscillans n. sp. This generic name has 

 not been used in the systematic works which have appeared 

 since (Macquart, Walker, and Zetterstedt) until it was reinstated 

 by me in the Proc. Acad. Nat. Sci. Phila. 1859, as a subgenus 

 of Limnobia. 



The genus Glochina, introduced by Meigen in his Yol. YI, p. 

 280, 1830, for Glochina sericata Meig., has not been sufficiently 

 characterized by him, and has never obtained a definite meaning 

 since. The alleged distinguishing characters are the fourteen- 

 jointed antennae and five-jointed palpi ; but it must be borne in 

 mind, that Meigen called the antennae of Limnobia from 15- to 

 lt-jointed (compare above, page 10), and that, for this reason, 

 fourteen-jointed antennae, which we know now as belonging to 

 the whole section of Limnobina, must have seemed unusual to 

 him. As to the palpi, the fifth basal joint is often visible, and 

 not in Glochina only ; as Mr. Westwood suggests ( Westw. Introd. 

 II, p. 525) it probably represents the maxilla. 



Macquart {Hist. Nat. des Dipt. I, p. 1*72) rather oddly places 

 Glochina among the Tipularioe florales of Latreille, between 

 PJiyphus and Simulium, on the ground that "Glochina, together 

 with Culex and Bolitophila, are the only nemocerous diptcra 

 hitherto observed which are provided with maxillary setae ; they 

 are, moreover, distinguished by five-jointed palpi, the third of 

 which is incrassated, like the second in PJiyphus." 



We find Glochina introduced with a query, in Haliday's Catal. 

 Dipt. Holyw. for D. leucocephala M. (syn. morio Fab.) and 

 dumetorum, as well as in the Synopsis, etc. at the end of West- 

 wood's Introduction, etc. Yol. II, for the same species. 



Stagger (Krojer's Naturh. Tidskr. Yol. Ill, 1840) placed three 

 species in it, Gl. stigmatica, autumnalis, and frontalis, which 

 are Dicranomyiae ; at the same time, other Dicranomyiae, as 

 modesta, dumetorum, chorea, didyma, are left by him in the 

 genus Limnobia. Thus it does not appear upon what the claims 

 of the genus, in this author's sense, are established. Unless the 

 peculiarities in the structure of the male genitals of G. autum- 

 nalis and stigmatica, already alluded to above (p. 5G) prove of 



