146 ZYG.^NID.E AND BOIIBYCID.E 



which are farther subdivided into two portions, the outer corneous and 

 hard, and shaped somewhat Hke the mandible of the mature moths 

 of this family, while the inner portions meet on the median line and 

 are more fleshy. 



"The two jointed antennae are placed directly opposite the thick 

 subtriangular truncated mandibles. 



"The labium and basal portion of the maxillae are broad and 

 thick. 



" The body is elongated and gradually increases in width to the 

 eighth ring, which is much enlarged and raised into a hump, from 

 which the body rapidly narrows, and the tergum falls down at an angle 

 of 45° to the broad lunate supra-anal plate. 



" The rings are slightly convex ; across their middle is a row of tu- 

 bercles ending in hairs equal in length to that of the ring itself Upon 

 the tergum of each ring are four large tubercles arranged in a broad 

 trapezoid, two in front and two more distant, on the middle of the 

 ring ; on the thoracic rings these tubercles are arranged in a single 

 transverse line and on the supra-anal plate in a square. Below is a 

 lateral row of similar warts, one for each ring, immediately below which 

 is a row of stigmata, behind which on each ring is a minute wart. 

 On the pleural line of the body, formed by the triangular raised por- 

 tion of the side of each ring is a tubercle ; and at the base of all the 

 legs is a single similar wart. On the sternal side of the body, on the 

 segments between the legs, is a transverse row of smaller warts than 

 those above, which are inclined to be germinate between the true and 

 false legs. There is a distinct thickening of the skin on the sides of 

 the anal legs as in the Bombyces. 



"The coloration of the body generally is a light hue, with linear 

 transverse tergal stripes, about six for each ring, and nearly black in 

 color, which are interrupted near or between the tubercles." 



Pupa. " The whole body is elongate and rather slender ; both the 

 head and prothorax taper continuously towards the clypeal tubercle, 

 which is quite prominent. The antennae do not reach to the end of 

 the wings. The prothorax is twice as broad as long ; slightly carinated. 

 The sides of the body are continuous and straight from the base of the 

 wings to the fourth abdominal ring, while the body itself is hardly 

 depressed or constricted at the juncture of the thorax and abdomen. 

 The wings meet upon the sternum, reaching to the middle of the body. 

 Fifth to seventh rings of the abdomen separated by deep sutures, while 

 the surface of each ring is flat, not convex, with two rows of small 



