MANDUCA ATROPOS. 421 



is present upon the second and third thoracic segments, and 

 broadens considerably towards the intersegmental furrows, and 

 especially towards that which separates these two segments from 

 each other. Except on the anterior and posterior boundaries of 

 the prothorax the band is replaced on this segment by a 

 rather lighter and much broader patch of a brownish colour 

 with dark spots upon it. The whole dorsal band upon the 

 three thoracic segments is traversed by a narrow median light- 

 coloured line lying over the dorsal vessel. The sides of the thoracic 

 segments are also dark-coloured, the tint spreading further up- 

 wards at the intervening furrows, while, on the prothorax, the 

 dark lateral tint extends until it is continuous with that of the 

 dorsal patch, so that there is very little of the light ground 

 colour on this segment. This small amount of the light ground colour 

 is chiefly on the dorsal aspect of the segment, anterior and 

 posterior to the brown patch, and even over these limited areas it 

 is interrupted by the traces of the continuation of the dark band 

 of the two segments behind. There is also a small lightish patch 

 on the sides of the prothorax in one of the specimens, but even 

 this is clouded with darker markings. Hence nothing could be 

 more unlike than the arrangement of markings on the thoracic 

 segments of these two varieties. The face is also striped with 

 two additional dark lines, of which those on the same side are 

 continuous inferiorly and superiorly, but do not meet those of 

 the opposite side in a A. These are parallel with the margins 

 of the dark borders of the head also present in the yellow variety. 

 In one specimen, the nearest line has fused with the dark margin, 

 except for a short section of its length superiorly. The clypeus 

 is also bordered by a fine dark line. Again, the dark borders to 

 the oblique stripes pass backwards, and meet in a V at a point 

 considerably in front of the posterior boundary of each abdo- 

 minal segment, from the first to the seventh inclusive, while, 

 in the other variety, the borders meet at the boundaries 

 themselves. Posterior to the apex, in the brown variety, 

 the darker borders again diverge in a smaller V, with its 

 apex directed forwards, and thus making an X with the 

 other V. Each side of the smaller V is prolonged back- 

 wards to the intersegmental furrow, where it meets with the 

 oblique border behind that with which it is continuous anteriorly. 

 The series of seven X-like marks which are thus seen upon the 

 first seven abdominal segments is exceedingly characteristic, and 

 quite unlike the Vs of the yellow variety. The "eighth border" 

 is quite distinct, and forms the first X, although it is smaller 

 than the others, while the seventh of these markings is the 

 least distinct. Although there seems to be some difference 

 between the two sections of the oblique borders (being dark 

 brown above and a lighter reddish-brown below), there is not 

 so sharp a demarcation as in the other variety. There is 

 apparently no trace of the oblique stripes, although there is 

 a linear light-coloured posterior edge to the inferior anterior 

 section of each border (as in the yellow variety). In one of 

 the specimens I was very interested to find a distinct trace of 

 the subdorsal line, which is present (as in the adult whitish 



