166 DIPTEEA. 



metallescent. Thorax metallic green, beset with scattered, erect, moderately long, 

 yellowish hairs ; scutellum more bluish metallic. Abdomen brown ; hind margins of 

 the segments with a whitish border, both on the dorsal and on the ventral sides ; 

 pubescence short, dark, and little conspicuous on the upperside ; paler hairs towards 

 the tip and on the venter. Stem of the halteres brownish; knob whitish-yellow. 

 Tegulee pale, with a pale brownish border. Coxae blackish, paler at the tip; legs 

 brownish-yellow; ungues black. Wings pale brownish, somewhat darker along the 

 costa, and lighter within the basal cells; costal and first veins dark brown; the first 

 vein becoming perceptibly stouter towards the tip. A single female. 



N.B. — The hind part of the mesonotum being injured by the pin, I cannot describe 

 the praescutellar callosities, &c. 



LASTA. 



Lasia, Wiedemann, Analecta ent. &c. p. 11 (1824) *. 



1. Lasia scribae, sp. n., <s . 



Thorax metallic green, with violet reflections ; abdomen metallic violet, with bluish and greenish reflections 



towards the end ; legs black ; antennae broken, but probably black ; wings with a brownish tinge. 

 Length 17-18 millim. ; proboscis 18 millim. 



Hab. Guatemala (coll. 0. SacJcen). 



In one of the specimens the violet (amethystine) reflections on the thorax take 

 distinctly the shape of stripes — in the middle a pair of longitudinal stripes, abbreviated 

 behind, and, on each side, another stripe, abbreviated in front ; in the other specimen 

 these stripes are not distinctly marked. The surface of the thorax and abdomen are 

 finely, but densely punctate. A pale yellow, more or less recumbent pubescence is 

 visible principally on the anterior half of the thorax and on the last two segments of the 

 abdomen ; on the pleurae are more dense and villose pale yellow hairs ; some stiff black 

 hairs among the yellow ones on the thorax, especially round the root of the wings and 

 at the base of the scutellum, The pubescence of the eyes is a generic character. The 

 tarsi, especially on the underside, are beset with short rufous hairs, so much so that the 

 hind pair appears almost rufous, although the ground-colour is black. Tegulae yellowish- 

 brown, with a black margin. Wings of a uniform pale-brownish tinge, with black 

 veins ; the second vein ending in the first close before its tip ; the anterior branch of the 

 third vein reaching the costa at the tip of the first vein. Two specimens (the one is a 

 male, the other has the end of the abdomen injured). I dedicate this species to 

 Dr. Scriba, who kindly gave me the specimens. 



N.B. — The venation of this species differs from that of the Lasice whose wings have 

 been figured by Wiedemann (Aussereur. zweifl. Ins. i. t. 4. f. 3, and ii. t. 9. f. 2), or by 

 Guerin (Iconogr. t. 94. f. 9) : the second vein ending in the first, and not in the costa, 



* Lasia is also in use in Coleoptera, but Wiedemann's name dates sixteen years earlier than that of Hope. 



