UNDESCRIBED SPECIES OF MUSCID.E. 151 



somewhat dusky : orbits and face whitish : arista black, very- 

 slender: palpi not dilated. (Length, above 2 lines; wings, 4|.) 



In moist places, Holy wood ; in the month of June ; rare. 



Trib. — Geomyzidje, Fallen. 



Gen. — Opomyza, Meig. 

 Subgen. — Geomyza, Fallen. 



Sp. O. G. sabulosa. Ferruginea puncto verticis thoraceque 

 fuscis, abdomine nigro, alls abbreviates . 



Head, antenna?, and legs, pale ferruginous ; a spot on the vertex, 

 and two larger patches on the occiput, brown. Thorax dusky. 

 Abdomen glossy black. Poisers pale. Wings imperfect, scarcely 

 longer than the thorax, and very narrow. The hairs of the arista 

 are much shorter than in 0. G. combinata, &c. (Length, £ line.) 

 Occurs but rarely, at the foot of the sand-cliffs which skirt 



the Bay of Killiney, and on the sands of Port Marnock. It 



leaps with great vigour, but cannot fly. 



Subgen. — Leptomyza, Macq. 



Sp. O. L. cinerella. Cinerea, fronte antice et antennis 

 subtus ferrugineis, facie palpisque albidis. 



Ash-colour, the head and thorax, above, of a rusty tinge. The margin 

 of the front, and the third joint of the antennae, beneath, rusty-red. 

 The face and palpi yellowish-white. The extremity of the abdo- 

 men, in the female, attenuate, inflected, and terminated by two 

 styles. Halteres yellowish- white. Wings brownish ; the second 

 transverse nerve distant by twice its own length from the margin, 

 the interval of the transverse nerves scarcely greater. The legs 

 long and slender, black, the base of the shanks and feet sometimes 

 brownish. (Length, 1 line ; wings, 2, or less.) 



On the muddy sea-shore at Holywood; in August. 



Gen. — Diastata. 



Sp. D. fulvifrons. Thorace cinereo, abdomine nigro, fronte 

 pedibusque ferrugineis, alarum basi fusco-maculata. 



Allied to D. obscurella, the antennae similar, but the hairs of the 

 arista shorter. Front and antennae ferruginous, face whitish. 



