SUBFAMILY CALLIPHORINAE 249 
regard cuprina (including pallescens) as a parasitic race of ° 
sericata slightly modified from the true form by its parasitic 
mode of life. It may be true that such habits tend to modify 
anatomy and account for differences between Australian speci- 
mens of cuprina which have been reared from eases of strike in 
sheep and the North American pallescens which is of no economic 
importance, but the differences between the cuprina-pallescens 
and sericata groups are so sharp.and clear-cut that there should 
be no reason to confuse them. 
A ecupreous green species similar in general habitus to older 
and smaller individuals of sericata but with the metasternum 
bare. 
Male. Head height 9.1; eye height 7.2; bueca 0.23 of eye 
height; length at antenna 5.2 and at vibrissa 5.3; epistoma elon- 
gate and nearly as wide as clypeus but shorter and flatter than 
in sericata, the facial profile more arcuate; metacephalon hardly 
apparent in profile; bueca reddish brown in ground color, with 
rather thin bright silvery pollen and with numerous short black 
hairs; frontale about 0.48 of frontal width, reddish brown anteri- 
orly, often black or brownish black particularly posteriorly; front 
at narrowest 0.28 of head width, 0.18 at vertex and 0.31 at 
lunule; head width 11.0; parafaciale opposite lunule 1.3 in 
width; vibrissae set 1.9 apart and placed 0.75 above oral mar- 
gin; parafrontale with bright silvery to yellowish silvery pollen, 
with a few seattered dark hairs outside the frontal row, these 
not extending anteriorly to the foremost frontal bristle and 
most numerous at vertex; frontal row of bristles consisting of 
about seven or eight bristles which are rather short and hairlike 
posteriorly; a pair of well-developed divaricate accessory ocellar 
bristles immediately behind and between posterior ocelli; vertex 
-subpollinose, slightly silvery over brownish black ground color; 
faciale bristly only at or but sliglttly above vibrissa; proboscis 
about one-half head height, haustellum about one-fourth head 
height; palpus 3.0 in length; antennal segments usually black 
but often orange to orange brown; third segment three times 
as long as second; back of head black, usually metallic greenish, 
with two rows of postocular cilia and with pale hairs, the latter 
most apparent on postoral margin and above toward occiput. 
Thorax pale yellow green with a metallic cupreous luster es- 
pecially in certain lights, with several metallic cupreous longi- 
tudinal stripes on dorsum which are difficult to distinguish un- 
less viewed anterodorsally, one outside acrostichal row extending 
from anterior margin to slightly beyond suture, and another out- 
side dorsocentral row extending from suture toward scutellum, 
