74 
THE entomologist’s RECORD. 
coloured egg contents, this has the form of a colourless ring 
round the coloured internal egg proper. In most species the 
young larva is very plainly visible through the shell before 
hatching. In psi and tridens it is perhaps most evident, owing 
to the transparency and thinness of the egg shell, and the 
transparency of the larva itself. It lies coiled round the egg, 
making one complete circle with the head in the centre, and 
the arrangement of dark and pale segments in psi and tridejis 
is such that the black head in the centre is surrounded by a 
margin divided into six nearly equal parts which are alternately 
dark and light tinted. 
The hatching may occur in from five to twelve days after 
laying, according to the temperature prevailing. It is perhaps 
repeating unnecessarily, as the sculpturing is almost identical 
in all the species, to point out that the transverse ribs are only 
represented by a waved outline of the summits of the primary 
ribs and hollows on their sides, the hollows and projections of 
the sides of the ribs corresponding to each other on opposite 
sides of each furrow, and therefore alternating in adjacent 
furrows, and that the micropylar area is marked by a small 
circle of slightly raised radiating lines, surrounded by a hardly 
raised irregular margin in which the ribs terminate ; the ribs 
arise from this to the number of about twenty, and increase in 
number towards the margin by dividing dichotomously in some 
instances, in others by arising de novo^ in the hollow between 
two other ribs. 
The newly hatched larva (PI. VI., fig. i) is 2 mm. in length, 
very distinctly larger than that of tridens, this is unmistakably 
seen by drawing them under the camera when the head of the 
larva of psi is decidedly larger than that of tridens, in the pro- 
portion of 8 to 7 in diameter. The only other point of differ- 
ence that I can be sure of is that the 13th segment in psi 
belongs rather to the dark series, in tridens certainly to the 
pale. I think I may also say that the tubercles of psi are 
rather larger and more markedly angulated than those of 
tridens, and the lateral plates of the pro-legs are nearly 
colourless in tridens, distinctly dark in psi. 
When fully grown in this skin, it has a trace of a broad yellow 
dorsal line on the pale segments, viz., 3.4, 6.7, 10. ii, the 12th 
segment is already large and dark, with its four tubercles set 
four-square ; the 13th segment seems intermediate in tint be- 
tween the dark and light series. The hairs (this applies also 
to tridens) are one to each tubercle, those of the anterior 
