142 



abdomen; metathorax never with prominent oblong tubercles; 



pupae found either in cocoons or in the ground . . Hemileucidae. 

 aa. Pupae with the movable segments never provided with flange-like 

 plates which prevent their being telescoped, the lateral margins ap- 

 proximately parallel so that the segments appear of equal size and 

 are usually telescoped so that only the caudal margins of the seg- 

 ments are visible ; wings prominently elevated dorsad above the 

 level of the body, the caudal portion of the mesonotum and meta- 

 notum always depressed adjacent to the wings ; a distinct cremaster 

 rarely present; stem of the flagellum of the antenna always ele- 

 vated and distinct Saturniidae. 



Family Hemileucidae 



Margins of the free segments never with a row of spines; the 

 body surface never roughened with spines ; antennae with the stem of 

 the flagellum never distinct, the central axis never set with spines, the 

 antennae tapering gradually from the part having the greatest width ; 

 maxillae never more than one sixth the length of the wings ; proleg 

 scars seldom prominent on abdominal segments five and six and rarely 

 with the anal proleg scars visible; mesothoracic wings with the anal 

 angles broadly rounded, usually at the cephalic margin of fourth ab- 

 dominal segment, and usually reaching the caudal margin of the fourth 

 abdominal segment ventrally ; metathoracic wings never produced be- 

 low the anal angles of the first pair of wings and never visible in 

 ventral view ; metathorax never with prominent tubercles ; abdominal 

 segments 5 to 7 with the cephalic margin produced into a thick obliciue 

 flange-like plate directed caudad ; cremaster short, never bifurcate 

 at tip. 



Although not usually included with the Hemileucidae the genus 

 Automeris is placed in this group owing to the very evident relation 

 of the pupae to those of the genera Hemileuca and Pseudohazis. 

 Morphologically thev seem to be more nearly related to the Hem- 

 ileucidae, but they are found in cocoons like the Saturniidae. Some 

 of the members of this family pupate in the ground. 



The description of this family is of necessity very incomplete 

 owing to lack of material. According to our available knowledge of 

 the subject the three genera may be separated as follows: 



a. Cremaster bearing setae arranged in a tranverse row and spreading 



out fan-like Pseiidoliazis Grote and Robinson. 



aa. Cremaster never with setae, either with curved spines or without 

 spines or setae of any kind, 

 b. Cephalic part of segment above the flange-like plate either smooth 

 or with fine longitudinal striations; pupae found in ground. 



Hemileuca Walker. 



