102 THiE CANADIAN ENTOMOLOGIST 



On 31 July I received from Mrs. W. A. Cassels from Sylvan Lake, Al- 

 berta, a female moth and eggs. 



^V.(/— I'li^^ <-'g;i?'^. l'-* in number were laid in rows close together but not 

 touching. In shape round, except at the flattened base. Diameter approximate- 

 ly 1mm. Surface smooth, infinitesimally pitted. Colour rich yellow. Period of 

 incubation (from eggs obtained later) ten days. 



6th .August, 9 ])ni : the eggs less yellow, with the black heads of the em- 

 bryo larvae clearly defined at top : movement of heads noticeable, and also open- 

 ing and closing of mandibles and protrusion and contraction of mouth-parts. 

 Eggs circumscribed with two or three strands of long black hairs. 



7th August 4.30 pm : three larvae hatched, the number by 9 pm. being in- 

 creased to ten, by 10 p.m. to thirteen, and the balance by morning. Exit obtain- 

 ed by larva eating the shell immediately above head to requisite size for body to 

 pass through. The newly emerged twist and stretch themselves, and take a 

 short respite, after which they make their first meal under new conditions on 

 the empty egg shells, feeding indiscriminately, two or three often at work on the 

 same shell, and even in some instances, endeavouring to get at the broken edge o^ 

 an egg through which another was hatching. 



Larva Stage 1. Length about 2mm. Head black approximately the same 

 width as the body. Colour of body, including tubercles and legs, entirely yellow 

 Tubercles prominent ; setae black, very long — say two to three times diameter of 

 body. 



Two or three hours after hatching the ground colour of body has become 

 dirty yellow, and the tubercles, shield on first thoracic segment, and legs, glossy 

 black — the change first noticeable on thoracic shield and fore legs. The tuber- 

 cles on the abdominal segments 1-8, dorsal view, are situated as follows — a pair 

 anteriorly, and a jiair widely separated posteriorly — the four forming a crescent. 

 There are also three or four tubercles on the sides of each segment. Thoracic 

 segments 2 and 3 and abdominal segment 9, dorsal view, have double or twin 

 tubercles widely separated in place of the two pairs of the other segments as 

 above described. The twin tubercles have two hairs, and the oblong shield on 

 thoracic segment 1, four short setae. 



8th August. By the evening larvae commenced feeding on the upper and 

 lower surfaces of the leaves of the food plant, leaving the tissue. 



10th August. Length 5 mm. A double row of light brown blotches each 

 side of the dorsum and another low down on the sides; the ground colour of -the 

 dorsum and sides is now greenish yellow. 



14th August. Larvae off their feed all day and by the evening of 15th 

 all have moulted. I^ength 6-7 m. Ai)pearance radically changed : tubercles larger 

 and bristling with short glossy black setae in place of long single or double hairs 

 of prior stages. Ground colour of dorsum and sides yellow, irregular brown 

 blotches connecting tubercles on either side of dorsum. Head brown. 



22nd August. Length (S-9 m. The irregular brown blotches have darken- 

 ed and extended on the sides — the yellow being less discernible. The yellow 

 dorsal stripe remains, posteriorly broad enough to include the pair of tubercles 

 referred to previously, and again widening at the base of each segment. 



