298 



timate segments, and an elevated ridge beset with minute teeth on the 

 anterior part of the eleventh dorsal segment. Near the anterior edges of 

 the other abdominal segments there is a row of very minute and nearly ob- 

 solete teeth pointing backwards. Color, dark chestnut brown. Length two 

 inches, breadth nearly three fourths of an inch. 



Dryocampa senatoria Sm.-Abb. [PI. n, fig. 9; PI. iv, fig, 12.] 

 Red and black striped caterpillar of the oak. 



Larva seen. Pupa. Imago. 



Aug. 31. Sept. 8. (2) July 1, 9. 



" 14, 3. 



Aug. 6 (one third grown). 

 Eggs laid upon the under side of leaves. 



Dryocainpa stigma Fabr. [PI. n, fig. 12.] 



Found on an oak tree, Sept. 18, 1841. 



Length and size of the figure. Dark wax yellow, shaded with red, and 

 covered with white elevated dots; head deep ochre yellow, rounded and 

 smooth; a narrow dorsal and a wider, lateral, dusky line; tubercular spines 

 black, with elongated white points around them; spiracles black on a white 

 ground. First ring with four elevated black dots; second with two elon- 

 gated, filiform, obtuse and movable, black horns, and on each side three 

 acuminated, black tubercles, one above, one on, and one below the lateral line. 

 Remaining segments to the twelfth inclusive, with two dorsal, elongated spines, 

 and on each side, one above and two below the spiracles. Thirteenth seg- 

 ment with one dorsal, two lateral, and two subventral spines before, and two 

 small dorsal spines behind, on the sides of the anal triangle. 



Went into the earth Sept. 24, 1841. 



Dryocampa pellucida Sm.-Abb. 



Sept. 25, 1827. Found on the oak a horned larva, similar to the com- 

 mon, gregarious, horned, black and yellow striped catei-pillar of the oak. 

 Body deep pea green, with longitudinal stripes of pale green, disposed like 

 the yellow stripes in the one just named. Spines and horns black, and a 

 transverse series of six black spots on the edge of the first segment or neck. 

 Tenth and eleventh segments rosaceous at the sides, head ferruginous. 

 Beneath pea green, margined with dark green. 



Found two larvas on the oak at Prospect Hill, Waltham, Aug. 8, 1849; 

 both had been stung by Ichneumons, and I took off from them a considera- 

 ble number of the oblong oval white eggs. Form similar to that of D. sen- 

 atoria. Body thickly covered with minute pearly white granules; greenish 



