en 
Dr, T. A. Chapman on Latiorina orbitulus. 149 
where the Androsace grew there, and where LZ. orbitulus 
had been fairly common two years before. 
The weather was chiefly to blame for nothing but some 
reconnoitring being done until June 28, when I visited 
the Tschampigen Alp (circa 7000 ft.), and with the aid of 
my sisters and nephew (Mr. C. L. Milligan) I succeeded in 
obtaining over a dozen of the desired larvae. 
The smallest found was about 6 mm. long, the largest 
14 mm.; 18 mm. seems to be the length of an average 
full-grown larva not specially extended. 
Several were found somewhat hidden in rather bushy 
plants of Gregoria (Androsace) vitaliana, but most were 
fully exposed, on or close to the plant, as if sunning them- 
selves, though one or two of these were actually feeding 
on the flowers. ; 
In captivity they will eat the leaves of the plant, but 
preferred the flowers, eating enough of the corolla to 
enable them to reach the centre of the flower, and they 
were seen with their heads buried deeply therein, and 
abandoned flowers consisted of nothing but the calyx, the 
whole interior having disappeared, probably uneaten 
portions of the corolla had dropped off. 
In the autumn, before hibernation, the larvae have only 
the leaves to eat, either of Androsace or Soldanella, prob- 
ably in spring they eat the flowers of the latter plant as 
they do those of Androsace. 
The larvae obtained at Binn were in the fourth and fifth 
(last) instars, except one specimen which was found with 
an ichneumon cocoon attached to it; the larva was alive, 
and remained so for some time, it was still in the third 
hibernating instar, the same stage to which my most 
advanced larva had attained in the preceding autumn, 
thus showing that I had obtained all the stages, the 
relative sizes of the heads of the five instars obtained 
being in a series showing none was absent. 
The measurements taken of length of head were— 
An exactly proportional series 
Actual measure. would give 
1st Instar ‘18 mm. 18 mm. 
2nd ,, oy aa yer 
Beds. 73 42 =, <.'} Gomer 
Ath ,, ‘GO 4 0 *.;; 
5th ,, ‘84s, ‘90 
