iQio] A Structural Study of Some Caterpillars iii 



Saturniidae: Tubercles of ninth abdominal segment separate. 



Labrum notched about half its depth; adfrontals without secondary 

 hair, the puncture very close to the upper seta; secondary hair of labium 

 in two parallel rows, (as in Apatelodes) secondary hair also on maxilla,, 

 but not on labrum or mandible ; maxillary lobes well developed, decidedly 

 longer than broad. 



Hyperchiria io. Figs. 6G to G8. 



Labium with not more than one or two secondaries; mandible with 

 secondary hair; maxillary lobes minute; labrum cleft two thirds its width 

 or more; adfrontals with several secondary hairs. 



Labrum with secondary hairs; warts of body larger, several 

 haired. 



Example Telea polyphemus. Fig. 09 and 70. 



Labrum and warts with primary hair, warts smaller. 

 Example Tropaea luna. Figs. 71 and 72. 



(The labrum in this figure is aberrant). 

 GvNANisA ISIS agrees structurally with this family. 



Endromidae. 



With secondary hair on epicrania, front, maxillae and body^ 

 but none on adfrontals, clypeus, labrum, mandible, labium, etc. ; 

 hair minute. Epicrania large and front small, higher than wide, 

 punctures of front far apart and lower than setae; labrum deeply 

 notched, seta vi a short distance from the margin. Hi, iv and v close 

 to the margin ; mentum not very wide, about as wide at the base as one 

 of the submenta ; upper ocellus minute ; prolegs with hooks in a single 

 row, alternately of two lengths, anal legs larger than the ventrals. 

 There are no North American species of this family. 

 Example Endromis versicolor. Fig. 57. 



BOMBYCIDAE. 



With secondary hair on epicrania, front, and body, and with one 

 each (in the specimen before me) on adfrontals and maxillae, hair 

 minute, but denser and longer than in Endromis. Tufted hair repre- 

 sented in adult by a single rudimentary tuft in the sub ventral region. 

 Punctures, etc., about as in the Sphingidae and Satumoidea; setae ai 

 of labium moderately far apart, but not so far as in Satumiina. Basal 

 joint (the one fused to the maxilla) of maxillary palp unusually broad. 

 Prolegs with a single row of hooks, alternately of two lengths. Caudal 

 horn present. There are no North American Species of this family. 

 Example Bombyx mori. Fig. 58. 



NOTODONTIDAR. 



Head with secondary hair, only in.Melalopha; body with or without 

 general secondary hair, but always with it on the prolegs; seta vib- 

 distinct unless covered by secondary hair; epicrania with setae H well 

 above the top of the front; submenta large and nearly meeting; frontal 

 punctures farther apart than in most Noctuidae, often close to the 

 setae, front small, the head extending twice its height above its top; 

 prolegs with hooks in a single band, not alternately of two lengths ; anal 

 prolegs reduced or modified, with fewer hooks; primary setae distinct, 

 arranged as in the Noctuidae, often on enlarged tubercles. For super- 

 ficial structural characters in this family see Packard's Monograph of 

 the Bombycine Moths, Part I. 



