400 



THE GYPSY MOTH. 



with rufous and black, the latter arranged each side in a 

 longitudinal series of patches ; interior to these is a row of 

 black spots, and upon the middle line four round spots, with 

 the largest one at the posterior end. 



" Length to tip of abdomen, 9 millims. Humeral width, 

 5 millims. 



"No. 40, Harris Collection $ . ' Cambridge, Mass., April 

 20, 1827.' 



' ' The specimens vary very much in depth of color and in 

 the size and distinctness of the markings. 



"In my own collection are specimens from Maine and 

 Minnesota. A female from Massachusetts is twelve millims. 

 in length." 



In the imago state the antennae and tarsi (Plate 62, Figs. 

 4 and 5) are increased by an additional joint, and become 

 respectively five and three jointed. The imago varies in 

 color from a blackish gray to a light brownish gray, though 

 none of the specimens so far taken or reared are of as light 

 color as JP. modestus Dall. The males (Plate 62, Fig. 1), 

 as a rule, are slightly smaller than the females (Plate 62, 

 Fig. 2), and their humeral angles are somewhat sharper, 

 more nearly approaching those of P. spinosus Dall. 



For the identification of the specimens reared at the in- 

 sectary I am indebted to the courtesy of Prof. P. R. Uhler. 



The following extract from notes upon an individual of 

 the third brood, reared from eggs laid Aug. 14, 1895, will 

 serve to illustrate the life history of a single generation : 

 Predaceous bug. No. 142, Podisus serieventris Uhl. 



Hatched August 22 ; the first molt occurred August 26. 

 Up to this date the bug had been fed upon the remains of 

 four climbing cut-worms (^JSfoctua c-nigrum) , The second 

 molt took place September 3. Between the first and second 

 molt it killed four larvae of JSfoctua c-iiigrum and two larvae 

 of Rhynchagrotis alternata. The bug molted for the third 

 time September 8, having killed in the mean time two full- 

 grown caterpillars of Vanessa antiopa and two of Anisota 

 senatovia. The fourth molt occurred September 21. 

 Between the third and fourth molt it had killed eight full- 

 grown caterpillars of Vanessa antiopa, two larvae of Am- 



