354 Professor Williston on the 



Gonia chilensis, Macquart, Dipt. Exot., ii., 3^ 51^ pi. v.^ 

 fig. 4 ; Blanchardj Gay's Hist. Fis. y. Pol. de 

 Chile, vii., 422, pi. iv., fig. 20 ; Eoeder, Stett. Ent. 

 Zeit., 1885, 345. 



Gonia angusta, Macquart, Dipt. Exot., ii., 3, 51, pi. 5, 

 fig. 5 ; Walker, List, iv., 798. 



Gonia lineata, Macqnart, Dipt. Exot. SuppL, iv., 178. 



B^ah» South America ; Mexico ; West Indies. 



One specimen, which with much probability is con- 

 specific with those from Cuba, referred to G. chilensis, 

 by Macquart. That the species is the same as G. pallens 

 is, to me, somewhat doubtful. It therefore seems worth 

 while to give a better description of our specimen. 



$ . Claws small : sides of the face with bristles ; third joint of 

 the antennse seven or eight times as long as the second joint. Front 

 and face light yellow, silvery white poUinose, the sides of the 

 front subtranslucent, as though oiled ; sides of the face with 

 sparse, short, black bristles. Cheeks bare. Antennae black. 

 Median depression of the face wider than the sides ; no bristles on 

 its ridges. Darsum of thorax grey poUinose, somewhat shining. 

 Scutellum largely yellow. Abdomen narrow ; yellowish red ; first 

 segment under the scutellum, second and third with a slender 

 median stripe, and the posterior part of the fourth black ; pollen 

 inconspicuous, except posteriorly. Tegulse white. Wings sub- 

 hyaline ; the costal, subcostal, and marginal cells markedly yellow ; 

 veins elsewhere narrowly clouded with the same yellow colour or 

 a dark brown. Claws and pulvilli small, not as long as the last 

 joint of the tarsi. Length 11 mm. 



Phoeocera. 



Eob. Desvoidy, Myodaires, 131, 1830. 



1. Phorocera (^Prospherysa? ) _p^ter, n. sp. (PI. XI., 



tig. 91, head of $.) 



$ . Eyes very sparsely pilose, the scattered hairs visible only 

 under careful examination. Front about as wide as the eye, the 

 lateral, silver-grey margins narrower than the broad, brownish-red, 

 median stripe ; the frontal bristles reach nearly to the base of the 

 third antennal joint. First and second joints of the antennae red ; 

 third joint black, four or five times as long as the second. Face 

 and cheeks silver-grey, the lower part of the face and the cheeks 



