OMMATIUS.— ANAKMOSTIJS. 211 



hairs and a few black bristles ; beard pale whitish-yellow. Antennae reddish ; third 

 joint small, brown, the base reddish. Thorax: dorsum dull brown, the usual stripes 

 being coalescent; a border of golden-yellow pollen along the dorso-pleural suture, 

 emitting a branch along the thoracic suture and another between the humerus and the 

 dorso-central stripe ; two greyish longitudinal lines on the dorso-central stripe ; a spot 

 of grey pollen in front of the scutellum ; the latter yellowish-grey pollinose ; pleurae 

 pale orichalceous pollinose, the pollen also covering the coxae. Halteres reddish ; the 

 fan-like row of bristles in front of them black. Abdomen brownish-rufous, the incisures 

 darker ; the surface and sides beset with golden-yellow hair. Legs yellowish-red ; a 

 feebly marked brownish ring on the hind femora and a more marked one on the hind 

 tibiae ; a brownish spot on the upperside of the middle tibiae ; knees of the four 

 posterior legs brownish. Wings subhyaline ; a brownish-grey shade at the apex not 

 quite reaching the proximal end of the second submarginal cell ; on the posterior 

 margin this shade becomes very narrow and evanescent in the fifth posterior cell. 



The following species of Ommatius and Emphysomera have been described from 

 Mexico (there are none from other parts of Central America) by previous authors : — 



Ommatius fuscipennis, Bellardi, Saggio &c. Append, p. 23. — Mexico, Tux- 



pango near Orizaba. 

 pumilus, Macq. Dipt. Exot. Suppl. ii. p. 42, t. 1. f. 10 ; Bellardi, Saggio 



&c. ii. p. 59. — Mexico, Cuantla. 



parvus, Bigot, Ann. Soc. Ent. Fr. 1875, p. 247. 



Emphysomera pilosula, Bigot, 1. c. p. 243. 

 Mcolor, Bigot, 1. c. p. 244. 



ANAEMOSTUS. 



Anarmostus, Loew, Siidafr. Dipt. 1860*. 



1. Anarmostus iopterus. 



Asilus iopterus, Wiedem. Aussereur. zweifl. Ins. i. p. 438 \ 



Hah. British Honduras (Blancaneaux). — Brazil \ 



A single specimen from British Honduras is apparently referable to this species ; it 

 has the abdominal segments 6, 7, 8 alone steel-blue, the others black, opaque ; the 

 tibiae densely beset with white hair, but having, on the front side, a glabrous, metallic 

 blue stripe. Notwithstanding these discrepancies from the description, I believe the 

 determination to be correct, and my belief has not been shaken by the sight of the type 

 in Vienna, which, however, I have not been able to compare in detail. 



* This generic name has also been used in Pisces (Scudder, 1863) ; it has priority, however, in Diptera. 



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