June, 1901.] Beutenmuller : Stages of Smerinthus Geminatus. 89 



Stage VI. — Chocolate brown with the dorsal serrations and lateral 

 oblique stripes somewhat paler. The lateral stripes are now composed 

 of elevated serrations ; behind each stripe is a pale brownish-gray hue 

 or shade. Subdorsal serrated line somewhat like in the last stage, 

 but more prominent. The four fleshy tubercles with yellow warts. 

 Anal-plate maroon brown. Head chestnut brown, granulate, with a 

 paler stripe on each side. Mouth-parts yellow ; mandibles black. 

 Thoracic feet chestnut red. 



Food-plaut : Elm. 



As is well known the usual color of the fully grown larva is green 

 instead of brown and the species also feeds on linden and white birch. 



THE EARLIER STAGES OF SMERINTHUS 

 GEMINATUS. 



Bv William Beutenmuller. 



Stage I. — Wholly green. Caudal horn black. Head globular. 

 Length, 4 mm. Moulted June 5th. 



Stage II. — The head is now triangular and slightly furcate on the 

 vertex and covered with minute granulations. Along the sides of the 

 body are seven oblique yellow bands, broken on the subdorsum by a 

 longitudinal, narrow yellow line. The bands and lines are composed 

 of elevated granulations. Over the body are numerous elevated granu- 

 lations. Caudal horn reddish brown. Tip of thoracic feet pinkish. 

 Length, 7.5 mm. Moulted June 9th. 



Stage III. — Very much like the last stage, but the oblique lateral 

 stripes are paler and the subdorsal stripes more conspicuous on the 

 first to the end of the fourth segments. Length, 1 2 mm. Moulted 

 June nth. 



Stage IV. — Pale green with the subdorsal line only reaching to the 

 end of the fourth segment and composed of serrations, and much 

 deeper yellow. The body is covered with whitish green granules, 

 giving the larva a light appearance. The last oblique stripe on the 

 sides reaches to the tip of the caudal horn, which is black above. 

 Head triangular. Spiracles black. Thoracic feet black, pinkish at 

 the base. Length, 15 mm. Moulted June i6th. 



