14 PROCEEDINGS OF THE NATIONAL MUSEUM, vol.61. 



Hopk. U. S. number 11388. The larvse were feeding upon the edges 

 of the leaves and were in the sixth stage. On August 4 they had 

 shed, becoming prepupae and had entered the ground for pupation. 

 Adults emerged on August 25 of the same year. 



Subfamily Nematinae. 



Tribe NEMATINI. 



The larvae described below may be distinguished from the other 

 larvae herein treated by the possession of a cone and disk type antenna 

 with 4 joints or parts (fig, 7^), and a broad and flattened lacinia 

 armed with setae along the apical margin. The following table will 

 serve to separate the larvae here described : 



1. Area A with several hairs 2. 



Area A bare 3 



2. Pseudoeerci present Croesus castaneae, 



Pseudocerci wanting Pteronidea amelanchieridis. 



3. Pseudocerci present 4. 



Pseudocerci wanting 6. 



4. Lower seta or tube on anterior lobe of the alar area in black spot. 



Pteronidea winnanae. 

 Same seta or tube not in black spot 5. 



5. Postepipleurite of mesothorax and metathorax blackish. 



Pteronidea mendicana 

 Same areas pale ' Pteronidea plesia. 



6. Second joint from base of the maxillary palpus with tleshy proces.s at 



apical end of the inner side _ — . 7. 



Same joint without process Pontania amentivora. 



7. Area O indistinctly subdivided, forming C^'^ with C^ haired 8. 



Area C indistinctly subdivided, forming C ' ^ ' with C ' haired. 



Pristiphora betulavora. 



8. Feeding on Conjlus Pteronidea corylus. 



Feeding on Ahiits Pteronidea alnivora. 



Genus CROESUS Leach. 



CROESUS CASTANEAE Rohwer. 



Larva. — Stage IV. 



Size. — 15 mm, long. Head : 1.66 mm. high by 1.66 mm. broad. 



Stage V. 



Size. — 17 nmfi. long. Head : 2 mm, high by 2 mm, broad. 



Stage VI, 



Size, — 25 mm, long. Head : 2.5 mm. high by 2.33 mm. broad. 



Structure. — Head: Face view, circular in outline; epistoma and 

 labrum with 4 spines each and epicranium and f rons sparsely spined ; 

 eye disks not elevated, eye slightly convex ; antennae of the cone and 

 disk type, basal membrane with disks protruding, disks 4 in number, 

 nearly complete and joint-like; maxilla with palpifer and 4-jointed 

 palpus, the apical 2 joints quite small, lacinia broad, flattened and 



