900 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



with an obscure stripe paler thau the greeu in the middle of the back. Both the 

 thoracic and abdominal legs deep purple-red. Anal legs moderate, green on the sides. 

 Lateral ridge forms a white and yellowish Hue. Beneath, two subventral dark 

 stripes edged on each side with white. Length, 20""°. 



19. Geometrid larva. 



This caterpillar occurred on the hackmatack, in Maine, August 3. 



Larva. — Head not so wide as the body, rather small, the front, especially towards 

 apex, much flattened. Second and third abdominal segments swollen on the sides, 

 and eighth slightly humped and black above. Supra-anal plate rough above, ending 

 in 3 stout, piliferous tubercles below. Surface rough. Body dark green, with vertex 

 of head, upper part of third thoracic segment, and of second and- third and rest of 

 abdominal segments blackish, as if scorched by a fire. Between these patches the 

 upper side is dull rust-red, as is the head in front. Sides of body dark green, tinged 

 with dark. All the thoracic and abdominal legs dark rust ; sides of second and 

 third abdominal segments blackish. Length, 23™'". 



20. Geometrid larva. 



This caterpillar occurred on the hackmatack, at Brunswick, Me., 

 August 30. It began to pupate September 25. 



Larva. — Body slender, cylindrical, a little thickened on pre-anal, and thoracic seg- 

 ments. Head very deeply cleft; as wide as the body in the middle but not so wide 

 as the prothoracic region. Frothoracic segment much enlarged, with a hump 

 on each side on the front edge. On iifth abdominal segment a pair of very promi- 

 nent lateral long tubercles. Anal legs moderately large, the dorsal acute tubercle 

 moderate. Body dull brick-red, with a squarish patch on the front of each seg- 

 ment marbled with black and whitish. There is a median black line on the thoracic 

 region. Body glaucous, grayish white under the last one-third of abdomen. It 

 may be recognized by its dull, brick-red body, checkered with dark, by the humped 

 prothorax, and by the two prominent tubercles on fifth abdominal segment. No 

 warts or papilUe, the body being a little wrinkled. Length 20™"*. 



September 2b, fully grown larva. — Prothoracic segment not so much humped as when 

 young. 



21. Geometrid larva. 



This caterpillar occurred on the hackmatack, at Brunswick, August 



4, 1882. 



Larva. — Large, dark, twig-like, with deeply notched head. Head large, as wide as 

 the body, very deeply notched, each tubercle acutely conical. Prothoracic shield 

 square, with a flattened boss on each side of front edge. Body cylindrical, with a 

 lateral conical conspicuous tubercle on each side of the segment in front of the first 

 pair of abdominal feet. Lateral line not prominent. On top of segment in front 

 of supra-anal plate a transverse interrupted ridge, composed of two oblique, yellow- 

 ish brown tubercles. Skin somewhat roughened, twig-like, but darker than twigs 

 of hackmatack. Anal legs large and broad, each ending behind in a spine. Supra- 

 aual plate large, flat, triangular. Skin with raised black and white papillse. Length, 

 22""". 



22. Geometrid larva. 



This caterpillar occurred on the hackmatack August 18 to 23, 1883, 

 in Maine. It rests like Drepanodes varus, head down, and lengthwise 

 to the twig, which it resembles somewhat, especially the darker ones, 

 and is easily overlooked. 



