DIPTERA. 371 



EHAMPHOMYIA. 



Rhamphomyia, Meigen, Syst. Beschr. iii. p. 42 (1822). 



1. Rhamphomyia cyanogaster, sp. n. 



6 . Black, silvery-dusted. Abdomen metallic blue. Eyes separated, narrowly on the lower part of the 

 face, facets nearly uniform. (Antennae imperfect.) Trophi piceous at the base and yellow distally, 

 one and a quarter times the height of the head. Thorax black, closely covered with silvery tomentum, 

 therefore when viewed from the front presenting a white appearance ; this tomentum encroaches on the 

 first two segments of the abdomen and on the coxa., and is slightly noticeable, but greyer, on the venter 

 and hypopygium. No thoracic pile. Halteres swollen, black. Abdomen depressed, shining metallic 

 blue, greenish towards the tip, with scattered, fine, black bristles and a terminal fringe of closer-set ones 

 Hypopygium small, terminal, consisting of two dorsal and two longer lateral robust metallic pieces and 

 the hidden yellow filament. Legs rather short and strong, piceous, with brownish irregularly-placed 

 hairs. Wings completely hyaline ; veins brownish ; discal cell complete ; costa a little thickened beyond 

 the first vein. 



Length 2'75 millim., of the wing 3 millim. 



Hal. Mexico, Omilteme in Guerrero 8000 feet {II. II. Smith). 

 One male. 



2. Rhamphomyia furcifer, sp. n. 



Black. Antennae black, stout, shorter than the head ; first joint short, third equal to two and a half times 

 the length of the second ; arista short, stout. Pace dull black. Thorax dull black, except where the 

 coating is rubbed, when the surface is of a shining metallic blue ; prominent in front, m length equal to 

 the abdomen, not pilose. Halteres black. Abdomen shining. Legs rather stout, almost black. 



S . Third antennal joint stouter at the base. Eyes moderately separated. Proboscis piceous, equal m length 

 to the eye-height. Abdomen robust, cylindrical, metallic blue. Hypopygium small, terminal; filament 

 thick, black, all but the tip exposed. Posterior tibiae with a tubercle at the middle of the posterior 

 surface, above which is an obliquely forked process, the outer tooth of this being strong; beyond the 

 tubercle the posterior surface is clothed with a brush of brownish hairs. Wings opalescent-white ; 

 nervures, except the costa and the first longitudinal vein, very weak ; third vein light brown. 



2 Eyes widely separated. Proboscis black, in length equalling one and a half times the eye-height. 

 ' Abdomen depressed, black, not metallic, except slightly so in certain lights, pointed at the tip, and with 

 two long, apical, black styles. Wings cinereous-hyaline, all the veins stronger, though not all well- 

 marked. 



Length 2 millim., of the wing 2-25 millim. 



Bob. Mexico, Omilteme in Guerrero 7000 to 8000 feet (H. H. Smith). 



3. Rhamphomyia tolteca, sp. n. 



6 . Head and thorax opaque greyish-black. Head and face dusted with greyish Eyes narrowly contiguous : 

 facets distinctly larger on the upper part of the eye. Antenna, black ; first and second joints subequa , 

 rounded, third twice as long as the other two together; arista shorter than the second antennal pint, 

 well-marked. Proboscis equal in length to the height of the head, black. Palpi dull fuscous. Dorsum 

 of thorax and scuteltum, pleurae, and coxae, except the tips, black, cinerascent, with a brownish tinge : 

 mesonotum with indications of median, lateral, and humeral broad faintly greenish vittae the humerai 

 ones interrupted; thorax without pile. Halteres pale yellow. Abdomen twice the length of the head 

 and thorax, with a greenish tinge, grey-pollmose, with fine, scattered, yellow hairs besides the fine dark 

 bristles; hypopygium ascending, apically yellow, filament exposed Legs slender; bind pair long 

 fuscous; almost piceous, especially towards the base; tibiae, especially the posterior pair, with short 



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