26 DIPTEEA. 



before reaching the green humeri, and posteriorly before reaching the green scutellum 

 (the spines of which are brown) ; between the scutellum and the root of the wings, 

 on each side, there is a triangular green spot pointing forward, but not reaching the 

 suture ; another green spot in the angle formed by the mesothoracic with the dorso- 

 pleural suture ; metanotum black ; the pleurae are party-coloured with black and green ; 

 a large green spot above each of the front coxae ; an oblique green band running from 

 the humerus towards the mesosternum, and emitting anteriorly a branch towards the 

 front coxa ; a large elongate spot in front of the mesopleural suture, contiguous on one 

 side to a similar spot below the sterno-pleural suture, on the other to the green spot on 

 the mesonotum ; hypopleura and metapleura for the most part green ; a green stripe 

 across the pteropleura ; sternum black. Abdomen black, with a green border (which 

 is broader on the dorsal than on the ventral side) running around it ; a green cross-band 

 on the second segment, and a less distinct one on the third. Legs, including the coxae, 

 black ; base of the femora and the first joint of the tarsi white ; the tip of that joint, 

 however, is black, as well as the extreme root ; the white of the front tarsi is dingy. 

 Halteres pale yellow, the knob green. Wings hyaline ; stigmatic region brown ; apex 

 with a distinct grey tinge. A single male. 



N.B.— The hind metatarsus has a distinct swelling on the underside, probably a 

 sexual character. 



2. Rhaphiocera caloptera, sp. n., a . 



Thorax green, with black stripes ; both the submarginal and the diseal cells brown ; apex and hind margin of 

 the wing with a pale brownish tinge; femora brownish-yellow, the tibiae and tarsi darker, the first joint 

 of the four hind tarsi white, except at the tip. 



Length 14 millim. 



Edb. Mexico, Paso del Macho {Edge). 



Mole. Head and thorax green; a black spot above the antennae, another in the 

 middle of the front, contiguous to the eyes, and a third on the occiput, including the 

 ocelli; antennae brownish-yellow; arista whitish. Mesonotum black, with four green 

 stripes (the intermediate ones abbreviated posteriorly, a little before the scutellum, and 

 incurved anteriorly towards the green humeri; the lateral ones, between the meso- 

 thoracic suture and the humerus, do not quite reach the latter, and run somewhat 

 obliquely, leaving a narrow, acutangular black strip between them and the pleura) ; 

 post-alar callosities green, this colour extending also a little in front of them ; scutellum 

 green ; metanotum black ; mesosternum with a large black triangle in front of the 

 middle coxae, its bifid apex not reaching the front femora; an elongate black spot 

 under the root of the wing (on the pteropleura), another above the middle femora. 

 Abdomen brownish, with narrow green borders ; the second segment with an indistinct 

 green cross-band at the base ; venter brownish. Front coxae green ; hind coxae with a large 

 brown spot at the base, greenish at the tip. Femora brownish-yellow ; tibiae brownish, 



