104 ILLINOIS BIOLOGICAL MONOGRAPHS [422 



protuberances with three marginal setae; length 11 mm.; width of head 1.3 mm.; 



on chestnut and butternut; Y-93 C-cu 667 Acordulecera sp. 2. 



4(1) Sucker-like protuberances on abdominal segments 2-4 and 8 5. 



5(8) Sucker-like protuberances with three marginal setae; on oak 6. 



6(7) Head light brown with epicranial stem deep brown or brownish with vertical furrows 



lighter in color; legs brownish; length 9 mm.; width of head 1.2 mm.; Y-131 -137, 



C-cu 680, M-37 Acordulecera sp. 3. 



7(6) Head yellowish or light brown, with epicranial stem concolorous with body; length, 



7 mm.; width of head, 1.1 mm.; M-239, M-243, C-yll dorsalis Say. 



8(5) Sucker-like protuberances with five marginal setae; head deep brown, vertical 



furrows and epicranial arms lighter in color; legs whitish, concolorous with body; 



length, 9 mm.; width of head, 1.2 mm.; on hickory; Y-144-5 tnusta MacGillivray. 



Family Pamphiliidae 



Larvae (Fig. 1) of medium size; body subcylindrical, slightly flattened 

 on the ventral aspect; sublateral lobe on the ventro-lateral margin dis- 

 tinct, moderately large; body slender to robust; segmentation and annula- 

 tion distinct; cuticle microscopically setiferous, appearing smooth, often 

 delicate, transparent; color usually greenish or creamy white; head semi- 

 globose, prominent, as wide as thorax; color creamy or brownish or blackish; 

 mouth directed ventrad; head completely exposed, sparsely setiferous; 

 epicranial suture and vertical furrows present; antennae extremely long, 

 setaceous, conspicuous, seven-segmented; ocularia located ventro-laterad 

 of antennariae; mouth-parts normal, sericos produced and prominent; 

 prothorax with shield-like, usually brownish, broad patches on the dorsal 

 and lateral aspects; thoracic legs modified, setiform, sharply pointed, 

 segments cylindrical, distal segment very long, slender, straight; third 

 abdominal segment with four annulets on dorsal and ventral aspects; 

 spiracles on the second annulet; larvapods wanting; eighth abdominal 

 segment on the venter mesad of the lateral lobe with a fleshy protuber- 

 ance resembling a larvapod, ninth segment cylindrical, smaller than the 

 preceding; tenth segment depressed, rounded on the caudal margin, 

 usually setiferous, sometimes conspicuously so, often with colored patches, 

 always with a median hook-like suranal process near the caudal margin 

 of the tergum; subanal lobe with a pair of setiform, three-segmented 

 conspicuous subanal appendages; insects one- or two-brooded; spinning 

 silken web or rolling leaves for their nests; solitary or gregarious; pupate in 

 the ground. 



The Pamphiliidae is an easily circumscribed family of eight or nine 

 genera and a large number of species which are peculiar to the Northern 

 hemisphere. The adults differ from all other Hymennoptera except the 

 Xyelidae in the preservation of the subcostal vein in the hind wings. 

 In this character it is more generalized than the Xyelidae altho it is 

 more specialized than this family in other features of venation. Brischke 



