CHERSODROMIA. 137 



grey. Eyes contiguous beneath the antennae. Antennae ferruginous 

 at the base ; third and fourth joints brown. Wings brownish-ferrugi- 

 nous, pale at the base and at the tips, and with a pale costal mark ; 

 praebrachial areolet very narrow, three-fourths of the length of the po- 

 brachial. Abdomen and legs ferruginous ; fore femora very thick. 



Rare. On sandy coasts near Dublin. In Mr. Haliday's col- 

 lection. (I.) 



Genus XX. CHERSODROMIA. 



CHERSODROMIA, Hal. MSS. Tachydromia p., Fin. Empis p., Ztt. 



Palpi proboscide breviores. Alarum vena cubitalis simplex ; venae exter- 

 no-mediee 2 ; areola discoidalis et vena subanalis nullee ; areola prae- 

 brachialis pobrachiali cequalis. Coxce femoribus breviores. 

 Palpi shorter than the proboscis. Wings often short ; cubital vein 



simple ; externo-medial veins 2 ; discal areolet and subanal vein none ; 



prabrachial areolet about as long as the pobrachial. Legs formed for 



running; coxa shorter than the femora. 



The Chersodromia mostly inhabit the sea-shore,, and in their 



habits resemble Drapetis ; they may be thus divided : 



a. Third joint of the antennas ovate-orbiculate, as long as the 'second. 



Species 1-3. 

 a a. Third joint of the antennae orbiculate, shorter than the second. 



Species 4. 

 a a a. Third joint of the antennas more acute, almost as long as the 



second. Species 5. 



1. hirta, Wlk. e. m. iii. 180 (1836). Niyra, antennis nigris, 

 alls albidis ad costam subfuscis, halteribus ferrugineis, pedibus nigris. 

 Long. If ; alar. 3^ lin. 



Black, hardly shining, clothed with black hairs and with a few 

 black bristles. Proboscis and palpi black. Antennae black; third 

 joint nearly round, a little longer than the second ; fourth twice the 

 length of all the preceding. Wings whitish, indistinctly tinged with 

 pale brown along the fore border ; veins dark brown ; second longitu- 

 dinal vein much nearer to the costa than to the third ; third and fourth 

 very slightly diverging from each other ; fifth straight. Halteres fer- 

 ruginous. Legs black, stout, hairy, beset with a few black bristles ; an- 

 terior femora and fore tibiae rather thick. 



Rare. Appears in summer and autumn on sandy sea-coasts, 

 among fuci. (E. I.) 



2. cursitans, Ztt. a. holm. 82 (1819); Fin. Nigra, obscura, alis 

 infumatis fusco-venosis, halteribw fuscis, tibiis posterioribus praesertim 

 pilis longioribus. Long, f ; alar. 2 lin. 



VOL. I. T 



