TWENTY-FIB8T ANNUAL MEETING. 



Ill 



ing minute polygonal, usually 6-sided, areas. Color, honey yellow; after hatching, 

 nearly white. * 



Mature larva: Length, 32 to 35 mm. Head, resinous, slightly bilobed — a narrow 

 brownish stripe marking each lobe in front. Mouth-parts light, mandibles tipped 

 with dark. Body moderately robust, especially at center. Thoracic segments small. 

 Abdominal segments 3-11, armed dorsally with large, fleshy bi-toothed elevations, 

 increasing in size from 4th to the 6th segment, then diminishing to the 10th. The 

 elevation on the 11th segment is considerably larger than that of the preceding seg- 

 ment, and has but one point. Tips of all the protuberances, crimson. Body, greenish: 

 upper half of sides washed with white, interrupted by a central dorsal hyaline line, 

 and an oblique hyaline line extending from the dorsal suture to the lower edge of 

 the white on each segment. 



A dull, crimson band marks the lower edge of the thoracic segments, and seg- 

 ments 11 and 12, continuing on the last to the tips of the anal prolegs. A spot of 

 the same color marks the lower edge of segments 4, 5, and 10. 



Abdominal feet exteriorly dull crimson, transversely lined with black. 



Thoracic feet resinous, with a brownish line or dot on the outer side. 



Venter, greenish. Stigmata, black. 



Pupa: 16x6 mm. Robust; dark reddish brown; last segment armed with a shin- 

 ing spine, forked, and recurved at the tip (see fig. c) — (wanting in one specimen, 

 uniformly present in 4 others examined). Wing and feet cases, etc., extend nearly to 

 the posterior margin of the 4th abdominal segment, and are deeply rugose. Abdom- 

 inal segments punctate, shining: the three sutures including the 5th and 6th abdom- 

 inal segments prominent, edges produced into minute ridges. 



Stigmata elongate, not prominent. 



ANISOTA STIG3IA FABR. 



a, larva full grown ; 6, pupa of male; c, male adult; d, pupa of female; e, outline of right half of fe- 

 male adult; /'.eggs on oak leaf ; jr, egg near hatching, showing larva within; A, newly-hatched larva 

 with detail of supra-anal plate ; g and h much enlarged ; the other figures the size of nature. 



During August and September the gregarious larvae of the above-named moth are 



quite commonly found on our native oaks, feeding in companies of ten to fifty or 



more. The leaves are eaten entire, except coarser veins, even by newly-hatched 



larvae; and limbs and small trees are frequently entirely defoliated by more mature 



worms. On falling, the young larv;© attach a thread to the leaf by means of which 



it may be regained; half-grown to mature larvae have not this habit, and are not 



easily induced to fall. After attaining full size, early in September, the larvre enter 



the soil an inch or more and construct earthen cocoons, in which the pupal stage is 



assumed seven or eight days later. 



