JfOtKS ON TttE DlstKlBtJtlON, ETC., Ol" ACtDALIA IMMOKAtA. 11 



Dktailed larval description. — Head. — White and shiny (like 

 china), with a line black central line extending from the dorsum of the 

 head, and bifurcating along the edges of the clypeus; sparingly 

 sprinkled with pale hairs, arising from black tuberculate bases ; 

 antenn;u white, tipped with black ; ocelli six — five of which are 

 placed in curved series on lower part of cheek ; of these, the three 

 lower are black, the two upper and outlying one, white. The two 

 dark sub-dorsal lines, and the two greyer dorsal ones are continued as 

 brown patches on the head. Thorax. — The pro-thorax is tumid, the 

 head being partly retractile, a ring of four dorsal and two lateral (on 

 each side) tubercles, pale, each bearing a single, pale, black-tipped 

 hair, passes round the front edge of the pro-thorax, whilst a similar 

 ring runs round the hinder edge. The pro-thorax is divided into four 

 sub-segments, the first being much larger than the others ; the pro- 

 thoracic spiracle is placed well back, almost in the inter-segmental 

 incision. The meso- and meta-thorax are not so swollen as the pro- 

 thorax. Each of these segments is divided into five sub-segments, the 

 first of which bears a ring of four dorsal and two (on each side) 

 lateral, single-haired tubercular warts. These are arranged as two 

 anterior and two posterior trapezoidals, the two former being placed near 

 together on the front of the sub-segment, and the two latter farther 

 apart, and farther back on the same sub-segment. The two lateral 

 tubercles on each side agree exactly with the two pre-spiracular 

 tubercles of the abdominal segments, and here they are respectively 

 placed above and below what looks something like an aborted spiracle. 

 Abdomen. — The first abdominal segment is divived into 15 sub- 

 segments. On this segment, the third sub-segment is the largest, and 

 bears only two dorsal tubercles, the anterior trapezoidals. The 

 spiracle is black, and has a shiny black rim, and is situated on a raised 

 portion of the skin on the fourth sub-segment ; there are two pre-spi- 

 racular simple-haired tuberles, one situated at a higher, and one at a 

 lower level than the spiracle itself ; there is also a post-spiracular 

 tubercle in the same line as the spiracle. The posterior trapezoidals 

 are placed on the 13th sub-segment. A lateral tubercle (in the 

 spiracular line) is also present on the last sub-segment. The 3rd-5th 

 abdominal segments are each divided into 20 sub-segments, the anterior 

 trapezoidals being on the 5th, the posterior on the 17th, and the 

 spiracle on the 7th sub-segment ; otherwise these segments resemble 

 the 1st abdominal. The Gth abdominal segment is reduced to five 

 sub-segments, the anterior trapezoidals being on the 1st, the posterior 

 trapezoidals on the 4th, and the spiracle on the 3rd, sub-segment. The 

 7th abdominal is further reduced to three sub-segments, the anterior 

 trapezoidals and the spiracle being placed on the 1st, and the posterior 

 trapezoidals on the 2nd, sub-segment. The 8th abdominal is com- 

 posed of only two sub-segments, the anterior trapezoidals on the 1st, 

 and the posterior on the 2nd, sub- segment ; the spiracle is also on the 

 1st sub-segment, but placed high up (quite out of the line of the other 

 spiracles). The 9th abdominal consists of only one sub-segment, 

 swollen dorsally, the posterior trapezoidals being actually placed 

 farther forward than the anteriors, the two lateral tubercles also very 

 distinct. The 10th abdominal forms a long anal flap, bearing the 

 tubercles on its posterior edge. The anal prolegs stand out well 

 behind. The ventral prolegs also point backwards. 



