On the British Hydromyzidae. 401 



is amongst the epiphytous Coniomycetes, and that it is indeed 

 nearly allied to Uredo urceolorum, &c. It will be seen, on look- 

 ing at Corda's figure, Ic. Fung. tab. 8. fig. 12, that the spo- 

 ridia in that species are clothed with a cellular integument. 

 Testicularia is a compound Uredo, the cellular integument of 

 its globules being a pseudoperidium, and the contained gra- 

 nules sporidia. I have not been able to see the flocci as di- 

 stinctly as they are represented by Klotzsch. There are traces 

 of flocci in U. urceolorum, 



iEdDIUM. 



JE. Euphorbias, Dec. Mauritius. Mr. Telfair. 



XLIII. — Remarks on the Generic Distribution of the British 

 Hydromyzidae (Diptera). By A. H. Haliday, Esq. 



[Continued from p. 224.] 



Gen. 3. HYDRELLIA. 



Caput oblatum. Oculi confertissime pilosi, quasi velutini. Men- 

 turn parum incrassatum. Antennae articulo 2° exunguiculato. Alae 

 exunguiculatse. 



Every facet of the compound eyes appears to produce a 

 short erect hair from its centre, which gives a velvety pile to 

 the whole, and an indefinite outline when viewed by a mag- 

 nifier, unless in the direction of a row of the lenses. 



Subgenerum Synopsis. 



Arista Tdorso pectinata 



J r . /"convexa 1. Hvdrellia. 



■s iacies ■< • o a z • 



I impressa 2. Atissa. 



Lsubtilissime pubescens 3. Glenanthe. 



Subg. 1. Hydrellia, Desv. 



Antennae articulo 3° ovato aut orbiculato, compresso, deflexo ; 

 arista dorso pectinata. Facies convexa, superne attenuata, squamu- 

 loso-micans, puncto lucido antennarum basin superante. Palpi sub- 

 dilatati. Alae apice rotundatae. Nervus discoidali-recurrens ab alae 

 margine parum distans. 



As the species of this group are subject to some variation 

 in the colour of the face, antennae and mouth, a more parti- 

 cular examination of the specific characters is required. This 

 will not be difficult, as they generally occur in great profusion 



