— 6i — 



Datana perspicua G. v> A'. 



The specimens described below were received Aug. 23, from 

 iMr. James Angus, and so named by him. 



Larva, static III or IV? — Length, 17 mm. The head is black, 

 not quite so wide as the botly. A shining black chitinous trans- 

 versely oblong prothoracic shield. The body is moderately hairy, 

 the hairs reddish; it is deep straw or lemon-yellow, with eleven 

 pitchy reddish lines: the median dorsal line is much broader than 

 any of the others and broader than the spiracular line; of the two 

 subdorsal lines, the upper is a little wider than the lower; the 

 lowest or infraspiracular line is interrupted by the sutures; the 

 two ventral lines of the same reddish color pass along at and in- 

 cluding the base of the thoracic and abdominal legs. The sur- 

 anal plate is small shining black. The anal legs are conical, black, 

 e.xcept the reddish planta which is distinctly reversible, being 

 seen at times to be retracted, though armed with hooks. The two 

 paranal plates are dark at the end; the end of the body is con- 

 stantly ui^held. The thoracic subdominal legs are black. 



Immediately after moulting one can see the fluids of the body 

 under the neck; the head is cherry red, while the suranal plate, 

 anal and other abdominal, and also the thoracic legs are pale 

 carneous. 



Stage V ? — Length at first, 20 mm, becoming the next day 

 23-25 mm. Body as before, but the stripes are blackish red, there 

 being no other change of importance. The suranal plate is a little 

 larger than before. 



Last stage. — Length, 40 mm. Head large, black, as wide as 

 the body. Prothoracic shield dark reddish black. 



The stripes are of the same relative w^dth as in stage III, but 

 have lost their red color, and are brown black, while the yellow of 

 the body has a greenish tinge. There is no red at all on the 

 prothoracic segment or on the legs or on any part of the body. 

 The suranal plate is large and black, the black median dorsal line 

 wider on the segment in front. 77u' /lairs are now whitish and 

 thicker than in the previous stages. 



Note. — When irritated it discharges a drop of green fluid, its 

 partly digested food. 



I notice that the hairs on the thoracic segments have at times 

 an individual motion, and are jerked one way and another, as also 

 the warts which give rise to them I 



One pupated Sept. 20, and another a little later. 



