Mexican mttscidae. 185 



blackish; the black dorsal stripe of the abdomen sometimes very 

 broad , the yellow colour being reduced to lateral borders. — 

 Length 7 — 9 mm. 



Hyalomyia munda n. sp. <?. — The whole body thickly 

 covered by a yellowish-grey tomentum; front broader than the 

 eyes; frontal band, four stripes on the thorax, antennae, and legs, 

 black ; wings yellowish , the costa somewhat infuscated , the veins 

 yellow. — Length 5,25 mm. 



Hyalomyia viliosa n. sp. <?. — Cinereous ; front broader 

 than the eyes; antennae, four stripes on the thorax, and abdomen 

 black; legs piceous; sides of the abdomen and underside of the hind 

 femora densely with yellowish pilosity; wings yellowish, slightly 

 infuscated towards the tip, veins yellow. — Length 7 mm. 



Hyalomyia h e b e S n. sp. $. — Yellowish-grey ; front broader 

 than the eyes; frontal band, antennae, four stripes on the thorax, 

 abdomen, and legs, black; sides and apex of the abdomen with 

 short yellowish hairs; wings greyish, their base, costa and tip 

 infuscated; the veins blackish. — Length 5 mm. 



Hyalomyia ochriceps n. sp. <?. — Black ; front ochraceous , 

 as broad as the eyes; abdomen with metallic reflections; wings 

 hyaline, infuscated at the base. — Length 5 mm. 



Hyalomyia argenticeps n. sp. <?. — Head silvery-white; front 

 as broad as the eyes ; thorax grey with four black stripes ; abdomen 

 shining black with metallic reflections ; legs black ; wings greyish , 

 slightly infuscated at the base and along the costa. — 6 mm. 



Hyalomyia nigrens n. sp. $. — Front trigonal, posteriorly 

 with the eyes nearly coalescent; face prominent towards the oral 

 margin; thorax cinereous with black stripes; abdomen black, the 

 last three segments cinereous with the hind margins and a dorsal 

 stripe black; legs black; wings greyish. — Length 5 mm. 



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