224 On the British Hydromyzidae. 



* Clypeus snbexertus brevissimus. 



Sp. 9. ohscurella, N : Discoc : nigricans, fronte thoraceque cine- 

 rascentibus, facie exalbida, tarsis ferrugineis. 



Notiphila nigrina. Meig. Dipt. Eur. vi. 69. — HydrelUa id. Macq. 

 3.^B. ii. 524. 



Var. (j. Antennis subtus et fronte antice ferrugiaeis. 

 , Notiphila ohscurella} Fallen, Act. Holm. 1813. p. 251. Hydrom. 

 10. Meig. Dipt. Eur. vi. 73. 



Var. y. Minor, thorace fusco, pedibus fere totis nigris. 



Common in moist grassy places ; var. /3. rare. 



Sp. 10. calceata,'^: Discoc : nigra subnitida, tarsis basi flavis, scu- 



telli disco subglabro. 

 Meig. Dipt. Eur. vi. 69. 

 Not rare about streams. 



Sp. 1 1 . pulicaria, N : Discoc : nigra, tarsis fuscis, scutello pube- 

 scente ; nervo pobrachiali non abbreviato. 1 lin. 



A minute species, with the wings scarcely exceeding the 

 abdomen ; the base of the costal nerve more bristly and the 

 radial rather shorter than in the others : the pobrachial 

 scarcely abbreviate. Arista with only four or five hairs. Tho- 

 rax and scutellum pubescent. Extremity of the abdomen 

 glossy. Club of the halteres white. Wings obscure hyaline. 



Not common ; mostly found on windows. 



** Clypeus exertus injlexus suhquadratus. 

 Sp. 12. glabra, N : Discoc : nigra nitida, tarsis basi flavis, alls hya- 



linis, halteribus fuscis. 

 Meig. Dipt. Eur. vi. 69. — Dlscocerina id. Macq. S. aB. ii. 528. 

 England. Communicated by F. Walker. 



Subg. 7. Hecamede, Curt. Guide, App. 

 Tibiae nisi apice nudse. Facies tuberculata. Oculiaperistomate 

 distantes. Proboscis bigeniculata. Antenna articulo 3^ orbiculato. 

 Abdomen planum subdeflexum 4-annulatum, ventre toto coriaceo 

 baud insecto. Alae abdomen non superantes. 



Sp. 13. albicans, N : Hec : albida, facie puncto nigro antennis 



tibiis tarsisque liavis. 

 Meig. Dipt. Eur. vi. 65. Macq. S. a B. ii. 522. 

 On sandy coasts, especially on fresh marine rejectamenta ; runs 

 fast and does not fly readily. 



[To be continued.] 



