60 ILLINOIS BIOLOGICAL MONOGRAPHS [60 



SUBOBDER JUGATAE 



SUPERFAMILY MICROPTERYGOIDEA 



The association of the Hepialidae with the Micropterygidae dates 

 from Comstoek's work on wing venation in 1893. Since that time they 

 have usually been placed together in a separate suborder from all other 

 moths and butterflies. There seem to be no larval structures, however, 

 which unite the two families. Dyar (1895b) after studying both Mi- 

 cropteryx and Eriocephala, as well as Hepialus, concludes that, "there 

 is nothing to contradict placing Micropteryx with Hepialus in the sub- 

 order Jugatae" and that "there seems to be nothing to preclude a deri- 

 vation of Eriocephala from Micropteryx"; but these statements are 

 hardly definite enough to convince one of the relationships of the genera 

 in the absence of constructive evidence. 



Family Hepialidae 



The larvae of several European species of Hepialus will be found 

 described in Part One. (See Figs. 2-6, 13, 14.) In addition it should 

 be mentioned here that the ocelli are not in a semicircle but are in two 

 vertical rows of three each and that the crochets of the ventral prolegs 

 are in a complete niultiserial circle, while those of the anal pair are 

 similar but are nearly or quite interrupted caudally. Sthenopis is an- 

 other American genus of this family but no larvae have been seen by 

 the writer. 



Family Micropterygidae 



The larvae of only one species of this family have been examined. 

 The setae are almost or entirely indistinguishable. Thoracic and abdom- 

 inal legs are wholly wanting and the head is strongly depressed. The 

 body is thickest at the prothorax and gradually diminishes posteriorly, 

 the anal segment having a very small diameter. The front extends to 

 the large vertical triangle. Close to the cephalic end of each arm of the 

 epicranial suture is a single large ocellus. 



Epimartyria auricrinella was the species seen. 



