1G4 FIRST AXNUAL REPORT OF THE STATE ENTOMOLOGIST. 



form is seen at c. At a, a, a, are shown the peculiar i^istol-shaped cases, 

 sheltering the larviT, composed of silk, bits of leaves and excremental 

 matter, which the caterpillars construct for their protection, and which 

 they curry about witli them during tlieir period of activity, serving 

 also for a winter retreat and for pupation. The smaller cases upon 

 tiie leaves show, in connection, the character of the larval injuries at 

 different statres of growth. 



The followdng detailed account of the caterpillar and of the moth 

 is that of tlie original description : — 



Description of the Larva and Moth. 



Larva — Length 4 mm. Color pale yellowisli, often witli faint roseate hue. 

 Head retractile, large, black, granulated, and with a few rather long hairs at 

 the sides ; median suture white ; antennae 4-jointed, yellow, with the base of 

 each joint white, the two basal joints equal in length, the third and fourth each 

 one-half as long and more slender ; a long bristle arises from the apes of the 

 second joint. Prolegs brown with the tips whitish ; thoracic legs yellowish with 

 the claws blackish. Thoracic joints each with a blackish, strongly granulate 

 chitinous patch at the lateral projection, the mesothoracic joint having also two 

 narrow black transverse dorsal spots posteriorly, and a subdorsal yellowish spot 

 of a similar nature. The two anal joints are covered with brown granulations and 

 furnished with rather long hairs. 



Imago — Female: — Expanse 14 mm. Head, face, and palpi white. Antennas 

 white anuulated with fuscous ; basal joint with a long tuft of intermingled white 

 and fuscous scales reaching to the sixth joint. Primaries fuscous (mouse-color 

 more nearly), with many white scales at the base, especially behind the median 

 vein. Cilia fuscous; secondaries fuscous; thorax white, with a few fuscous 

 scales. Abdomen with the anal tuft whitish. Legs white with a ring of fuscous 

 at the base of each tarsal joint. 



Male : — Expanse 12.5 mm. Differs from the female in the head, face, and palpi 

 being fuliginous, and in having no tuft on the basal autennal joint ; also, in being 

 somewhat darker, the wings usually lacking the white basal scales, and the legs 

 being more grayish. 



Ifatural History of the Insect. 



The history of the insect, as given in the report above cited, is as 

 follows: The parent moths appear abroad during the latter part of 

 July, and deposit their eggs on the under side of the apple leaves. The 

 lurvfB hatch in September, and commence to feed ujion the under sur- 

 face of the leaves. They are of the kind known as case-bearers, as 

 they construct for their ])i-otection and occupation cases composed of 

 silk, bits of leaves, and their excrementa, which they carry about with 

 them, thrusting out their anterior segments for the purpose of feed- 

 ing. The cases have a peculiar curve at their posterior end, like the 

 handle of a pistol. At the advent of winter they retreat within their 

 cases, which they attach to the twig, and the less than half-grown 

 caterpillar passes the winter in this condition. At this stage, the cases 



