186 DIAGNOSES OF NEW 
Hyalomyia piceipes n. sp.? — Front black, trigonal, the 
eyes a little separated on the vertex; face white, not prominent; 
thorax obscure cinereous; antennae, thoracic stripes, and scutellum, 
black; abdomen shining bluish-black ; legs brownish; wings hyaline. 
— Length 6,5 mm. 
Hyalomyia moerens n.sp. 9. — Front black, trigonal, sepa- 
rating the eyes on the vertex; antennae, thorax, scutellum, and 
legs, black; abdomen shining metallic violet; wings brown; small 
cross-vein on the middle of the discal cell. — Length 4 mm. 
Hyalomyia umbrosa n. sp. 9. — Black; front trigonal, 
scarcely separating the eyes on the vertex; abdomen shining violet; 
wings grey, the veins broadly bordered with brown; small cross- 
vein beyond the middle of the discal cell. — Length 6 mm. 
Hyalomyia umbrifera n. sp. 9. — Black; front trigonal, 
scarcely separating the eyes on the vertex; abdomen, except the 
first segment, cinereous, with a black dorsal stripe and the hind 
borders of the segments black; wings partly brownish; small cross- 
vein beyond the middle of the discal cell. — Length 5,5 mm. 
GYMNOSOMINAE. 
Cistogaster ruficornis n. sp. d. — Head pale yellow; 
frontal band testaceous; antennae and palpi rufous; thorax anteriorly 
testaceous with four brown stripes; abdomen rufous; thorax pos- 
teriorly, scutellum, dorssal spots on the abdomen, and legs, black. 
— Length 5,5 mm. 
Cistogaster melanosoma n. sp. g. — Black, including the 
antennae, palpi and legs; head whitish; shoulders, pleurae, and 
last abdominal segment, grey. — Length 6 mm. 
Cistogaster subpetiolata n. sp. g. — Grey; frontal band, 
stripes on the thorax, first and second abdominal segments and 
