REMARKS ON THE GENERIC CHARACTERS. 34 T 



The peculiar ornaments, which the figured males of Hygroceleuthus and 

 Dolichopus possess, as well as the strong swelling of the costa hefore the 

 tip of the first longitudinal vein in Hygroceleuthus are not generic, but 

 merely specific characters which, moreover, do not belong to the females. 



To the second yroup belong the genera Gymnoptemus (4), Paraclius (7), 

 Pelastoneurus (5), Tachytrechus (6), Orthochile (8), Hercostomus (9), 

 Sybistroma (10), Hypophyllus (11), and Haltericerus (12). The genus 

 Gymnoptemus, if understood in the limited sense adopted above, differs 

 from all the other genera of this group by the parallelism of the third and 



9 . Face whitish. 



Long. corp. 0.17. Long. al. 0tl7. 



Shining metallic green. Front bright, violet-blue, antennae yellowish- 

 red ; the pubescence on the upper side of the first joint rather short ; the 

 third joint rounded-ovate, however but little rounded at the end ; shorter 

 in 'the female than in the male, in both sexes blackened to a very 

 small extent on the upper margin and at the extreme tip. The arista of 

 the antennae in both sexes with a considerable feathery pubescence. Face 

 of the male not very narrow, ochre-brownish ; the face of the female broad, 

 whitish. Cilia of the inferior orbit yellowish. Upper side of the thorax 

 with copper-colored spots and with violet-blue reflections ; the former are 

 more striking in the male than in the female, while the latter are visible 

 either on the hind part of the dorsum of the thorax only, or spread on 

 its middle more towards the front. Scutellum violet-blue with blue-green 

 margins. Abdomen metallic green, often coppery upon most of the upper 

 part, black at the incisures, covered on the sides with a rather strikingly 

 white dust ; the hypopygium rather small, its second segment yellow 

 along the margin, which is turned towards the venter, and at the tip ; its 

 external lamellae scarcely of middling size, yellowish-white, with a very 

 narrow black margin, on the edge of the margin a little jagged and beset 

 with crooked black bristles. Coxae yellow ; the foremost are beset, besides 

 the usual black bristles, with short and fine black hairs ; the outside of the 

 middle coxae is almost entirely covered by a large gray-black spot. Feet 

 yellowish, even plain in the male ; hind femora with a bristle before the 

 tip ; fore tarsi brownish-yellow, about as long as the tibiae ; middle and 

 hind tarsi infuscated from about the tip of the first joint, brownish-black 

 towards the end ; the hind tibiae of the male without glabrous spot on the 

 hind side ; the first joint of the hind tarsi in both sexes has only one or two 

 strong bristles on the upper side. Tegulae with black cilia. Wings tinged 

 with dark gray with brownish-black veins ; the last segment of the fourth 

 longitudinal vein is interrupted twice at right angles, and has, at each 

 interruption, a long stump of a vein, as the other species of this genus ; 

 transverse veins without -any trace of dark margin ; in the male the costa 

 has a slight swelling immediately before the end of the first longitudinal 

 vein. 



Hab. Ceylon. 



