nereous-black. Head silvery white in front; mystax with very
few white and black bristles; pectus whitish; legs testaceous; tips of
the anterior femora and of the middle tibiae black; hind femora and hind
tarsi black; anterior tarsi and hind tibiae black, testaceous towards the
base; wings limpid, slightly cinereous towards the tips; veins black;
halteres testaceous. Length of the body 4 lines; of the wings 7 lines.

Gen. LEPTOGASTER, _Meigen._

43. LEPTOGASTER FERRUGINEUS, n. s. _Mas._ Ferrugineus, pectore albo,
abdomine nigro, segmentorum marginibus ventreque testaceis, pedibus
fulvis, femoribus apice nigris, tibiis piceo vittatis, tibiis posticis
tarsisque nigris basi testaceis, alis sublimpidis, halteribus testaceis
apice piceis.

_Male._ Ferruginous. Head pale, gilded in front, hind side and pectus
white; mouth and antennae tawny, the latter blackish towards the tips;
abdomen black; hind borders of the segments and under side testaceous;
legs tawny; anterior femora with a testaceous band before the tips,
which are black; hind femora and anterior tibiae striped with piceous,
the latter black towards the tips; tarsi and hind tibiae black,
testaceous at the base; wings very slightly greyish, veins black;
halteres testaceous, piceous towards the tips. Length of the body 7
lines; of the wings 10 lines.

44. LEPTOGASTER LONGIPES, n. s. _Mas._ Ferrugineus, pectore albido,
abdomine piceo, segmentis apice fulvescentibus, pedibus anterioribus
fulvescentibus, posticis piceis longissimis, femoribus posticis basi
testaceis, alis subcinereis basi obscurioribus costa venisque nigris,
halteribus testaceis apice nigris.

_Male._ Ferruginous. Head testaceous in front; mouth and antennae black;
pectus whitish; abdomen piceous, hind borders of the segments somewhat
tawny; legs somewhat tawny; hind legs piceous, very long, their femora
testaceous at the base; wings slightly greyish, darker towards the base,
costa and veins black; halteres testaceous, with black knobs. Length of
the body 4 lines; of the wings 8 lines.

45. LEPTOGASTER ALBIMANUS, n. s. _Mas._ Niger, capite antico pectoreque
albis, antennis basi ferrugineis, abdominis segmentis cano fasciatis,
femoribus, tibiis tarsisque basi albis, femoribus posticis luteo
fasciatis, alis limpidis, halteribus albidis apice piceis.

_Male._ Black. Head in front and the pectus white; antennae ferruginous
at the base; abdomen long, a hoary band on the hind border of each
segment; fe