July, 1920 
The Queensland Naturalist. 
87 
With others of our butterflies there is but little, if any, 
seasonal difference, though in many much variation, especi- 
ally in the genus Catopsilia amongst the Pieridae and Hypo- 
limnas in the Nymphalidae. In the two forms Catopsilia, 
(C. pyranthe pythias and C. lacteola) it is singular to note 
that C. lacteola brood follows C. pyranthe pythias brood 
so closely that they overlap, and may be found flying 
together. Having had succeeding broods of these, the first 
has always produced C. pyranthe pythias and the second 
C. lacteola. 
ON TWO INTRODUCED SLUGS. 
By John Shirley, D.Sc. 
[Read lyth June, 1918.) 
At the May (1918) meeting of the Club, Mr. Henry 
Tryon, Government Entomologist, exhibited two species of 
slugs that seemed unusual to him, and handed them over 
for identification. These proved to be the following intro- 
duced English species : — 
1. Limax maximus L. 
2. Milax gagates Drap. 
The first is the largest, 4 inches to 6 inches, of the 
English slugs, and usually feeds at night. In the daytime 
it hides in hedgerows, crevices of bark, under fallen timber, 
stones, &c. It varies in colour, but is usually yellowish- 
gray. It is by no means a welcome importation, as experi- 
ence in Tasmania and New South Wales has proved. ■ 
The second has also become abundant in Tasmania, but 
is rare in New South Wales and Queensland. The mantle 
is distinctly bilobed, and, when the animal is at rest, is 
.somewhat angulated on the right side. 
WRENS OF THE BRISBANE DISTRICT. 
By R. Illidge. 
(Read 15th March, 1920.) 
During a visit to Chermside Hills some members of 
the party reported having seen the Silvery-blue Wren, a 
