340 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



As early as 1827 Harris found a larva oa the black walnut. He says: 

 ''It is remarkable for the squeaking sound which it emits, apparently 

 by rubbing the rings of the anterior pare of the body together." This 

 specimen entered the earth to pupate as early as August 7. 



Larva. — Two ioches long, .22 inch broad at the eighth segment, .14 inch at the 

 first. Head large; longest diameter, twice that of the first segment; apex quite 

 pointed; color light green, with white lateral granulations. Body elongated, slender, 

 tapering gradually from the seventh segment to the extremities; light apple greeo, 

 granulated regularly on the annulations with white. Lateral bands, seven, lighter 

 green, approaching white, and made the more conspicuous from the increased size of 

 the granulations toward the broadest part of the band, each anuulation adding to it 

 a single granulation; extending over two segments and nearly reaching to the vas- 

 cular line. Caudal horn slender; .20 inch long, quite rough, with numerous acute 

 granulations, which are more prominent than those of the body. 



Pupa. — Male: 1.20 inches long, .40 inch broad. Dark brown, almost black, nearly 

 plane veiitrally, abruptly rounded anteriorly, and gradually posteriorly. Head-case 

 with two conical, granulated, divergent projections between the bases of the antennae- 

 cases, and two pairs of smaller ones between the eye-cases, and a pair on the anterior 

 leg-cases. Eye-cases with a tuberculated ridge. Antennae-cases quite prominent, 

 with a granulation on each joint. Tongue-case buried and not visible, the leg and 

 wing cases meeting at their tips. Stigmata, except the first, which is nearly closed, 

 quite oval. The seventh, eighth, and ninth segments with deep incisures, angulated 

 posteriorly, acutely granulated, and encircled on their posterior margin with a row 

 of spines, sub-obsolete inferiorly and superiorly. The tenth, eleventh, and twelfth 

 segments contracted laterally and flattened inferiorly, the eleventh segment spined 

 on the carination. The terminal segment ending in a broad, flat, rugose, truncate 

 projection. (Lintner.) 



I'he moth. — Difi^ers from the other species in having no eye-like spots on the hind 

 wings. 



8. The Virginia tiger moth, 



Spiloaoma virginica (Fabricius). 



Order Lepidoptkra; family Bombycid^. 



Occasionally devouring the leaves of the butternut, a very hairy, deep yellow 

 caterpillar, with a black head and body, the latter mottled with black; changing to 

 a thick chrysalis within a cocoon, where it remains until the following June, when 

 it appears as a white moth. 



This omnivorous caterpillar, commonly called "the yellow bear," is 

 known to feed on the butternut, grape vine, currant, gooseberry, grasses, 

 and various garden vegetables, and we have found it from the first to 

 the middle of September in Maine feeding on the buckthorn and also 

 the pitch-pine. According to Harris there seems to be two broods of 

 caterpillars and two of the moths. The caterpillars, he states, "are to 

 be found of different ages and sizes from the first of June till October. 

 When fully grown they are about 2 inches long, and then creep into 

 some convenient place of shelter, make their cocoons, in which they 

 remain in the chrysalis state during the winter, and are changed to 

 moths in the months of May or June following. Some of the first 

 broods of these caterpillars appear to come to their growth early in 

 summer, and are transformed to moths by the end of July or the begin- 



