AHT. 21. NORTfl AMERICAN SAWFLY LARVAE MIDDLETON. 5 



apical and interior^ margins (fig-. 2"") ; labium with palpiger and 

 2-jointed palpus. Thorax: With large spines; legs with 4 joints 

 and apical claw, joints haired, joint 3 with small process at apex on 

 inner side. Abdomen: (urites 5 and 10 chosen for describing be- 

 cause condition of larva would not permit complete study) tergum; 

 of urites 1-9 composed of areas A, B, C (C inclined to subdivide form- 

 ing a narrow C^ and broad C^) and D; B and C^ armed with large 

 bifurcate subdorsal and supraalar spines (fig. 2'') ; urite 10, tergum 

 consists of epiproct, with large and unforked spines in transverse 

 caudal row and several smaller unforked spines: sjDiracular area 

 rather small situated in alar region and containing a rather small 

 spiracle ; alar area bilobed — the anterior lobe, below C\ smaller and 



2" 



Fic. 2. — Perici^ista smiLARis RoHWEu. a. Maxilla; h, third urite. 



with small, unforked, alar spine — the posterior lobe, below C^, larger 

 and with large, bifurcate, alar spine; pleurum; preepipleurite and 

 postepipleurite distinct and separate, preepipleurite with a bifurcate 

 spine anterior of a smaller unforked spine, neither as large as the 

 tergal spines; postej^ipleurite with two unforked spines; hypopleurite 

 and uroi^ods present and without spines; uropods on urites 2-8, no 

 uropods on urites 1 and 9, postpedes on urite 10. 



Color. — Head: Epicranium brownish black above eyes; upper half 

 of frons brownish black; eye disks black; labrum, ventral mouth 

 parts and antennal joints, pale brownish ; apices of mandibles brown; 

 remainder pale green. Body : Leaf green, alimentary canal showing 

 darker; spines of tergum and alar area black; preepipleurite and 

 postepipleurite and smaller epiproctal spines pale or occasionally the 

 larger spines pale with brownish tips. 



^ Exterior with reference to maxillary palpus and galea. 



