MEMOIES UF THE NATIONAL ACADEMY OF SCIENCES. 



73 



Fig. 31i represents the fresbly Latclicd larva of HeplaJus muxidinus, 1.3 mm. in lengtli. The 

 head is no wider than the prothoracic segment, whose dorsal jilate is well developed. The month- 

 parts are quite large, especially the spinneret, while the hairs, which are acute at the end, are iu 

 this stage as long as the body is broad. Fig. 31i, A shows the arrangement of the one-haired 

 tubercles on the thoracic and first abdominal segment, and fig. 31i, /> those on the four terminal 

 segments. The abdominal legs appear to have at this stage only ten crochets, or at least 

 verv few. 



-mx.p, 



Fla. 32 1, 2, Full-fed larva of Hejpialus humuli; 3, 4. H. hfctus. 



(Cut loaned by the New York Entomological Society.) 



Fig. 33.— Pupa of Oncopcra iniricata,- 

 A , end of body enlarged ; sp, spiracle. 



Fig. 32i,2 represents the larva of the European Hepialus humuli ' and the arrangement of the 

 one-haired tubercles ; the prothoracic plate is thin and slight. Inif. hectus (&g. 323, 4), which is more 

 specialized, the prothoracic plate is more developed, and the piliferous tubercles (except one) are 

 much larger, forming plates. Yet this larva will be seen to be much less specialized than that of 



1 For blown specimens of this and Hepialus hectus, and numerous other rare sjiecimens of other larvse and pupse, 

 I am greatly indebted to the kindness of Dr. (I. Staudinger, who presented them to me from the immense collection 

 of Lepiiloptcia and other insects in his establishment at Blasewitz-Dresden, Germany. 



