250 Scientific Proceedings, Royal Dublin Society. 



Ephydridse. 



Hydrellia cardamines Hal. — Original description : — 



" Sp. 1. cardamines, H. nigro-senescens, antennis subtus facie ore palpis 

 coxis et tibiis anticis totis tibiis posterioribus apice tarsisque basi f ulvis ; 

 m.f. f-lj lin. 



" Var. j3. Facias albo-micante. 

 " Var. y. Antennis et mento nigris. 

 " Among aquatic plants, Hollywood ; local but not rare." 

 The specimens in the Collection evidently had been rearranged 

 by Haliday under the names flavilah'is and laticeps in accordance with 

 his note in the Errata to Walker's Ins. Brit. Dipt. iii. p. 344-345. There 

 are eleven specimens of _/?fftv7rt&/7's (one male bearing two labels "cardamines " 

 and " flavilabris," and one female a label " flavicosa,"] and three specimens of 

 laticeps (one female labelled " laticeps "). The white-faced variety mentioned 

 by Haliday is present in the collection, while his var. y. probably referred to 

 the female, in which sex the clypeus and third antennal joint are darker than 

 in the male. It is obvious from the labelling of the specimens that if 

 Haliday's name be retained it must be for flavilabris Stenh. and not for 

 laticeps Stenh. 



Hydrellia hydrocotyles Hal. — Original description : — 



" Sp. 3. hydrocotyles, H. obscure viridis tibiis anterioribus et posti- 

 carum apice palpis tarsisque fulvis, facie albissima : /. 1 lin. 

 "Hydrellia communis.— DeSY. Myod. 791 ? 

 " Hollywood ; extremely rare." 

 Tlie female specimen labelled " hydrocotyles " appears to be a female of 

 discolor with darkened base to hind tibiae, and as usual the third antennal 

 joint darker than in the male. Two specimens ( r? ? ) labelled " communis" 

 are also discolor, while there are two males labelled " discolor " which belong 

 to the same species, and probably represent that described by Haliday as 

 flaviceps Mg. for in the Errata to Walker's Ins. Brit. Dipt., vol. iii, he quotes 

 discolor Stenh. as a synomyn oi flaviceps Mg. 



On a card containing four females of discolor is a note in Haliday's 

 handwriting, " 0. intense virides," probably referring to the colour of the 

 eyes in life. 



Hydrellia porphyrops Hal. — Original description : — 



" Sp. 4. porphyrops, H. nigricans antennarum articulo 3° tibiis apice 

 tarsis basi fulvis, facie ore palpis flavis, puncto frontali albo, oculis 

 hyacinthinis ; m. ^ lin. 



