391 LARVAE OF THE TENTHREDINOIDEA—YUASA 73 



tenth abdominal tergum black; third abdominal segment with the following setal 

 map: 2, 2, 3, 1, 2, 4, 4-5, 7-8, 8-9, 9-10; mesothoracic supraspiracular spot more than 

 twice as large as subspiracular spot; prothoracic supraspiracular spots moderately 

 large and distinct; subspiracular spot involving few setae in caudal portion of sub- 

 spiracular tubercle; mesothoracic and metathoracic subspiracular spots without circu- 

 lar whitish areas around the proximal end of setae; maxillary palpi usually 3, 2, 1, 4; 

 head in young specimens pale brownish, with a row of very small supraspiracular 

 spots; head in older larvae blackish, body spotted like mature specimens but spots 

 smaller; on Populus; length of body, 21-23 mm.; width of head, 2-2.1 mm.; Y-172-1-1. 



Trichiocampus sp. 1. 



Priophorus Dahlbom 



Larvae small, hairy; length less than 17 mm.; body with dorsal half, 

 at least in part, usually with grayish or olivaceous shade; never with 

 spots; annulet 1 with a transverse row of several setae; annulet 2 with 

 two warts, each bearing 4-5 setae; annulet 3 with three warts, dorsal two 

 bearing 5-6 setae each, ventral with 8-10 setae; postsupraspiracular 

 wart usually with three setae; subspiracular lobe with 12-15 setae and sur- 

 pedal lobe with 6-9; setae usually more or less straight, usually of two 

 different lengths, longer ones usually less than one-half the height of the 

 head; warts bearing setae of two varying lengths, those on annulet 4 

 being among the shortest setae. 



SPECIES OF PRIOPHORUS 



1 (2) Front with a distinct blackish or fuscous spot; vertex with a dorso-mesal fuscous spot 

 occupying nearly the entire space between vertical furrows; body never pinkish but 

 whitish; head caudad of ocellarae fuscous; body dorsad of spiracular lines from meso- 

 thorax to penultimate segment olivaceous or grayish, color becoming dilute on caudal 

 segments; third abdominal segment with following setal map: 4-5, 4, 5, 1, 3, 6, 8, 12, 

 13, 8-9; maxillary palpi 2, (3, 4), 1; in younger specimens dorsal grayish shade con- 

 fined to cephalic segments; on hazel; length, 15 mm.; width of head, 1.5 mm.; M-109. 



modestius MacGillivray. 



2(1) Front without a distinct blackish or fuscous spot, but with a light or pale brown spot; 

 vertex with a dorso-mesal fuscous or blackish spot, not nearly occupying the entire 

 space between vertical furrows; body sometimes pinkish; not on hazel 3. 



3(4) Head brown; vertex with blackish spot occupying about one-half the distance between 

 vertical furrows; body pinkish; head with blackish spot caudad of ocellarae; dorsum of 

 mesothorax to first abdominal segment shaded gray, prothorax whitish; third 

 abdominal segment with the following setal map: 5, 4, 4, 1, 3, 5, 5, 10, 10-12, 6-2; 

 maxillary palpi, 2, (3, 4), 1; in younger specimens body whitish; length, 14 mm.; 

 width of head, 1.2 mm.; on Salix; Y-154-1-2 palliolatus MacGillivray.* 



4(3) Head pale brown; vertex on dorso-meson with blackish spot occupying two-thirds 

 the distance between vertical furrows; spot also caudad of ocellarae; body not 

 pinkish but whitish, dorsad of spiracular lines from mesothorax to penultimate 



*This species was described as Trichiocampus palliolatus n. sp. by Dr.MacGillivray in the 

 Entomological News, vol. XXXII, 1921, page 49, but the characters of the larva place it in the 

 genus Priophorus. Upon reexamination of the adult specimens, Dr. MacGillivray agrees 

 with me in the change I here make. 



