Genas Psorophora, 
265 
base with a little tuft of long black scales beneath. Halteres 
deep testaceous. 
Length .—8 mm.. 
Habitat .—Rio de Janeiro, Parque do Musen (Carlos Moreira) 
(11. 5. 99), and Chaco in Formosa, Argentina (Arriba!zaga). 
Observations .—-Senhor Moreira sends a single 9 hi excellent 
preservation; its dark black colour readily distinguishes it from 
the more common P. ciliata. The species was described by 
Arribalzaga in 1891, and appears to be of rare occurrence, for 
only a single specimen has been received, and Dr. Lutz has not 
met with it in Brazil. 
I do not think there is any doubt but that the specimen 
here described is Arribalzaga’s C. Holmbergii , although the 
description does not apply in all detail. Arribalzaga’s specimen 
may have been slightly rubbed, whilst the one sent by Senhor 
Moreira is in perfect condition ; the legs, however, instead of being 
white banded, have the basal bands pale testaceous. 
3. Psorophora scintillans. Walker (1848). 
Sabethes scintillans. Walker. 
(Brit. Mus. List, Dipt. i. 1 (1848).) 
(Fig. 39, PI. X.) 
Thorax black, with dusky brown curved hair-like scales in 
the middle and flat white spindle-shaped ones at the sides. 
Abdomen black, with brown scales with bright violet-blue 
reflections, first two segments velvety brown, the apical one 
tinged with metallic green, sometimes with white apical lateral 
patches. Legs black, with dense long dusky scales with purple 
and brassy tfec. reflections, apices of hind femora white, meta¬ 
tarsi and tarsi not so densely scaled as the femora and tibiae, 
except the hind metatarsi. Wings dusky yellowish-brown. 
9 . Head black, clothed with small flat scattered white 
scales and black upright ones and black bristles ; antennae dark 
brown, the basal joint deep ferruginous, nude ; base of the second 
joint also ferruginous; clypeus black, rather elongated ; palpi 
long, rather more than one-third the length of the proboscis, 
four-jointed, the penultimate joint longer than the first two. I 
can scarcely be sure of the presence of a fourth apical joint; it 
is probably hidden in scales; basal joint very small, all the 
