The Zoologist— April, 1869. 1615 



having made drawings of iheni, I had the good fortune to succeed in 

 rearing the perfect insect. 



The larvae in question were one centimetre long, the head was 

 shining black, the jaws dark brown, the six thoracic legs were black 

 at the bases — and further, as far as the claws, purplish brown. The 

 first three segments of the body were deep- or orange- yellow, the 

 fourth greenish yellow, the six following clear green, the last two 

 again were deep yellow ; the twelve abdominal legs were green, the 

 two anal legs yellow. On the first segment were six small shining 

 black spots, on the three following nine longitudinal rows of two spots 

 each, of which those above the legs were confluent — or, on each 

 segment, two transverse rows of nine spots. Above the legs, on either 

 side of the following six abdominal rings, were two elliptical spots 

 placed diagonally one above the other; above these were three smaller 

 vertical elliptical spots, succeeded by two larger round black ones. 

 On the last two segments were seven or eight dots on either side, 

 nearly every one having a short black hair ; there were no spines on 

 the last segment; between the legs on the ventral surface, which was 

 green, were six green-coloured glands. 



These larvae, after feeding on the leaves, spun up among them and 

 the mould on the 6th, 8th, 9th and 10th of July. The cocoons 

 (fig. 6) were gray or brownish yellow, with a coarse and veined ex- 

 terior of a brown colour; they were 9 mm. long. In the warmest part 

 of the summer this insect appears to require not more than seven days 

 for the passage from larva to imago, as on the 14lh I found an imago 

 (a female) had made its appearance. On the same day I also found 

 among the cocoons a pupa, the larva of which had apparently omitted 

 to spin a cocoon. This pupa, represented at fig. 5, was glassy ; 

 thorax and anus yellow; dorsum greenish; the legs, palpi and antennae 

 white ; the eyes black. 



I frequently afterwards met with these larvae, and, if I am not mis- 

 taken, 1 observed three generations, namely in May, June, and 

 August. It was not until June 1862, that I had an opportunity of 

 observing the eggs, when I had the good fortune to discover some on 

 the same poplar on which I had also found Nematus vallator, 

 Nematus pallicercus, and likewise many Lepidoptera. The eggs were 

 arranged in a very remarkable manner (see fig. 1) : they were so arranged 

 along the margin of a poplar-leaf that one egg was placed on each of the 

 teeth of the leaf; I counted twelve on one side of the midrib, and eight 

 on the other, inserted between the surfaces of the leaf. A couple of days 



