50 THE ENTOMOLOGIST. 



narrower than the body, very glabrous, and porrected in 

 crawhng ; the body obese, slightly narrowed at the anterior 

 extremity, and slightly swollen on the back of the 12lh seg- 

 ment. Colour of the head dusky semihyaline green ; body 

 pale dull green, with numerous small warts, and five equi- 

 distant pale, almost white, stripes extending its entire length; 

 these stripes are often tinged with yellow or yellow-green, 

 and the outer or lateral stripe is often bordered with dark 

 smoke-colour along its upper margin ; the warts are jet- 

 black and surrounded by a ring of pure white, and each 

 emits a rather conspicuous bristle ; on each segment there 

 are usually eight of these warts ; on the 2ud, 3rd and 4th 

 segments they are arranged in a straight transverse series, 

 but on the following segments, namely, the 5th to the I2th 

 inclusive, four of them are arranged almost in a square on the 

 back, and two below them on each side ; the medio-dorsal 

 stripe is narrow, but very distinct; the next on each side is 

 still narrower, irregular and interrupted ; the exterior or 

 lateral stripe is much wider than the others and very dis- 

 tinct; it includes all the spiracles, except the 1st and 9th ; 

 the upper margin of this wide stripe is sometimes bordered 

 with black, which merges abruptly in tlie general ground 

 colour : the ventral surface, including the legs and claspers, 

 is delicate apple-green, with a semitransparent appearance. 

 It changes to a pupa in a slight web on the surface of the 

 earth : the pupa is a brown-colour, covered with a beautiful 

 bloom like that on a' ripe Orleans plum : the moth appears 

 in July. — Edivard Ne?cnia)). 



Description of the Larva of Pol/a Chi. — The eggs are 

 laid in the autumn, and hatched in the spring, from the 17th 

 to the 31st of March : the larva feeds on Crataegus Oxya- 

 cantha (whitethorn) and Salix canraea (sallow). When full- 

 fed, which is about the middle of May, the head is slightly 

 porrected, and about equal in width to the 2nd segment; the 

 body is smooth and almost uniformly cylindrical, but slightly 

 decreasing in size towards both extremities. Colour of both 

 the head and body glaucous-gieen ; the dorsal area paler 

 thfin the ventral, and interrupted by three slender white 

 stripes, the medio-dorsal stripe being the least distinct of the 

 three ; the dorsal area is bounded, on a line with the spi- 

 racles, by a narrow black stripe, the upper margin of which 



