o62 SUPPLEMENT. 



The four specimens all have a very immature appearance, and would certainly 

 measure 4*6 to 5 millim. if less shrivelled. 



22. Psilopus purpureus, sp. n. 



d . Head, thorax, and abdomen purple ; coxae, femora, and hind tibiae black. Face wide, with a deep 

 transverse impression, lightly yellowish pollinose ; vertex very deeply excavated, clothed with fine 

 yellowish hair. Pleurae green, not much dusted. Halteres blackish. Abdomen with numerous pale 

 hairs on the dorsum near the base and on the venter ; hypopygiuni of moderate size, black, the lamellae 

 rather large, pale yellow. Fore tibiae with a row of bristles on the outer side ; fore tarsi moderately 

 infuscated beyond the first joint ; middle tibiae with only two or three bristles on the outer side, their 

 tarsi blackened beyond the middle ; hind tarsi with a row of long bristles on the outer side, and a shorter 

 denser row on the inner side. Wings hyaline ; first vein reaching to the middle ; hind cross-vein rather 

 oblique ; costa not ciliated. 



$ . Green, the abdomen with black bands, the middle tibiae with several long bristles, the pollen on the face 

 and the halteres white. 



Length 4-4 o millim. 



Hab. Mexico, Medellin near Vera Cruz, Tierra Colorada in Guerrero, Frontera and 

 Teapa in Tabasco (//. H. Smith). 



23. Psilopus forcipatus, sp. n. 



<S . Face wide, bright bluish-green, with a deep transverse impression, almost destitute of white dust; antennae 

 black, hairs of the second joint few, but rather long, arista less than half the length of the body ; front 

 bright metallic, with abundant fine whitish pile on the sides. Thorax and abdomen deep bluish-green, 

 both, as well as the vertex, with noticeably long bristles ; pleurae with thin white pollen, which in a 

 certain direction is quite conspicuous. Tegulae with long and coarse cilia ; halteres infuscated. Abdomen 

 with some white pile on the sides of the first four segments ; at the tip are two extremely long wavy 

 bristles, and several shorter ones: hypopygium large, black, the appendages brown, and in the form of 

 two large, stout, curved forceps-like organs. Coxae, trochanters, and femora black ; fore and middle 

 tibiae yellow, hind ones brown ; fore and middle tarsi infuscated from the end of the first joint, hind tarsi 

 black ; fore tibia with a row of rapidly lengthening bristles on the anterior side, not reaching the tip ; 

 fore tarsus twice the length of the tibia, plain ; middle femora with some long black bristles on the under- 

 side of the apical half (the middle tibiae have been somewhat denuded in the described specimens, but 

 there appears to be only one bristle of noticeable size, which is placed beyond the middle on the outer 

 side): middle tarsus almost one and a half times the length of the tibia, its fifth joint with some noticeable 

 small white hairs above. Wings hyaline, the apical half with a very diffused infuscation, which is densest 

 before the third vein ; cross-vein moderately oblique. 



Length 5 millim. 



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



Two males. This species is somewhat related to P. comaius, but differs in many 

 respects. 



24. Psilopus basilaris. 



Psilopus basilaris, Wiedem. Aussereur. zweifl. Ins. ii. p. 215 \ 

 Hab. Mexico, Teapa in Tabasco (H. H. Smith). — Bkazil 1 . 



Four females. The original specimen seems to have been of the same sex. The 

 yellow antennae, pale tegular cilia, yellow pleurae, including the ends of the transverse 

 suture, and the yellow bands of the abdomen render it a very easy species to identify. 

 Wiedemann's description 1 is very satisfactory : the colours are truly k ' herrlich." 



