New species of the Syrphid genus Callicera. 331 
This description was made from the original type 
specimen of Chrysotoxum erraticum in the British Museum. 
C, SACKENI. n. sp. 3. 
3. Head dilated and nearly two-thirds as long as broad, pubes- 
cence of face greyish-orange and hardly leaving a bare middle line 
but bare only just about middle of facial knob, a good deal of yellow 
dust along upper sides of face, pubescence similar to the facial is 
present all round under eyes and up lower part of back of head 
which is very little inflated; jowls aeneous. Eyes densely clothed 
with pubescence and I think I can trace a dark line of pubescence 
down eyes in the usual place. Frons shining black, almost or quite 
bare. Antennae without style not so long as head, both the basal 
segments short and third segment quite three times as long as the 
other two together, considerably dilated on the basal half and ferru- 
ginous beneath at the base, but tapering on the end half; style 
long, white and thin, but blackish and thickened at base, about half 
as long as the third joint. 
Thorax with brownish-orange dense pubescence, but more than 
hind half of disc with mainly black pubescence intermixed, and 
scutellum on disc with practically all rather conspicuous black 
pubescence, though beneath’ and round margin the pubescence is 
longer and all brownish-orange. Pleurae with brownish-orange 
pubescence. 
Abdomen bright aeneous though I can trace nearly all the second 
segment dull black and a broad dull black band right across the 
dise of third segment, it is on this latter segment that the bright 
aeneous colour is most conspicuous on the fore- and hind-margins, 
broader at the sides than at middle; the fourth segment appears 
coppery aeneous. Pubescence equal and dense of a more ruddy hue 
than on thorax with no trace of black hairs at tip. Belly with 
dense brownish-orange pubescence. Genitalia black. 
Legs rufous orange, femora black except on the tip quarter when 
they become indeterminately rufous orange, tarsi rather darkened 
above on the last two or three joints. Pubescence behind anterior, 
and in front of hind femora, dense, not very long, brownish-orange ; 
hind tibiae rather darkened above for a considerable space after the 
middle; coxae, trochanters, and base of femora conspicuously black 
haired, especially the coxae and trochanters. 
Wings rather brownish about base and fore part just past discal 
cross-vein and more so about costa to end of long subcostal vein, 
discal cross-vein at two-fifths of discal cell, upper marginal cross-vein 
a little angulated. Squamae dark brownish glassy, fringes of thora- 
