DIPTEKA. 359 



13. Psilopus atrolamellatus, sp. n. 



<J. Face pure green, white-pollinose when viewed from above ; antennae black, of moderate size, bristles of 

 second joint long, especially below, but not numerous ; front bluish, with the usual few small pale hairs 

 on the sides. Thorax green, pruinose with white, giving it a satiny reflection ; the bristles of the 

 dorsum large and uniform in size ; pleura? with a silvery reflection in one light only. Halteres pure 

 yellow, stem darker. Abdomen green, with blaek cross-bands of moderate width, and coarse black hair 

 and bristles ; hypopygium shining black, the lamellae of the same colour, large and flat, with an excavation 

 at the tip, and short curling dark hair on the inner side. Coxae and femora black, the tips of the fore 

 and middle femora yellow. Tibiae yellow, the hind ones but little infuscated at the tip ; all of them 

 hairy and with scattered bristles, but no rows that are conspicuous. Fore tarsus one and a half times as 

 long as the tibia, infuscated from the tip of the first joint, and Avith a couple of bristles on the outer side 

 of the latter ; middle tibiae of the same colour, but relatively shorter, and with some small obscure hairs 

 on the underside of the first joint; hind tarsi blackish-brown, hairy. Wings with large cross-bands, 

 filling out the apex, except behind, and narrowly connected on the fourth vein ; the apical fork makes 

 nearly a right angle at its origin and again at the bend. 



Length 4*7 millim. 



Hab. Mexico, Teapa in Tabasco (H. H. Smith). 



Ten males. 



14. Psilopus similis, sp. n. 



e . Extremely like P. atrolamellatus, but differing as follows :— Hypopygium minute, the appendages in the 

 form of two very small finger-like brownish organs ; fore tibiae with two or three rather long fine bristles 

 on the outer side ; middle tibiae with shorter bristles ; all the tarsi a little paler ; apex of the wing quite 

 broadly hyaline. 



Length 4-2-4-5 millim. 



Bab. Mexico, Venta de Zopilote in Guerrero, Cuernavaca in Morelos, Medellin 

 near Vera Cruz, Teapa and Frontera in Tabasco {H. H. Smith), Orizaba (H. H. Smith 

 & F. J). G.), N. Yucatan (Gaumer).— Brazil, Rio Janeiro (Williston). 



The Brazilian specimens have a little more brown in the tip of the wing, as in 

 P. atrolamellatus. 



15. Psilopus depressus, sp. n. 



cJ . Structure the same as that of P. similis, except in the following particulars :— The fore trochanters are 

 very pale yellow, and hence rather conspicuous ; and the hind tarsi are flattened in the last two joints and 

 the tip of the third, black, shining, concave below. 



Ilab. Mexico, Teapa and Frontera in Tabasco (H. H. Smith). 



Five males. There are five females, taken at Teapa and Amula, that belong to one 

 or more of the three preceding species, but I cannot identify them, the differences 

 between the males being so slight. 



16. Psilopus barbatus, sp. n. 



J . Face bright green, white-pollinose on the lower half, and bearing on this part numerous long black hairs ; 

 antennae black, second joint with a few moderately long bristles below ; front bright green. Thorax of 

 the same colour, the sides with indistinct greyish dust. Tegulae pale, with black cilia ; halteres yellow. 



