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 psz 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 tridens 

 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 da3's 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, 7iis., 3.4, 6.7, 10. 11, 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 



