17 
bers of locusts traveling south in search of food, nothing being left for 
them in the interior to feed upon. The country around Quorn was so 
dry and hot that some Eucalyptus rostrata in a dry river-bed were all 
the green vegetation that could be seen, and the locusts still met with 
were unable to feed. Finding the search for Icerya in this district use- 
less, I returned to Adelaide, where subsequently new colonies were 
discovered for shipment. In conversation about the grasshoppers en 
route, a gentleman remarked that only in such unusually dry seasons 
as the present would the locusts migrate, there being no food left for 
them in the interior of South Australia. Those around Quorn, he re- 
marked, left in a southeasterly direction down the valley toward Ade- 
laide, while those coming from the interior went towards Spencer's 
Gulf. On my trip I observed them most abundantly about Black Eock 
traveling south, not in clouds but scattered and never very high, simi- 
lar to our Caloptenus devastator in California in 1885.* 
November 29 I began collecting material for my second shipment. 
Already on some of the trees, well exposed to sun, about 90 per cent, 
of the flies had left the scales, while on the trees in more shady places 
more than half of the parasites were still within their hosts. Not a 
single fly was observed, and yet they must have been about in large 
numbers. Instead of this, I noticed sitting and walking about the 
scales a peculiar Chalcidt (Fig. 8) ; this was suspected to be a secondary 
Euryischia lestophoni, dorsal and side views— enlarged (after Biley.) 
parasite, and during the day I noticed them ovipositing in the infested 
Iceryas. The Lady-birds were at that time quite abundant in egg^ 
larva, pupa, and imago states, and special pains were taken not to 
miss any of these during the collecting. The following four days were 
* As kindly determined by M. Henri de Saussure, of Geneva, Switzerland. This is 
the Chortologa australis of his monograph of the Tryxalidas, not yet completed. 
t This is the species referred to in our annual report for 1888, p. 92, under the MS. 
name Euryiscliia lestophoni. 
14134— No. 21 2 
