ABT. 21. NORTH AMERICAN SAWFLY LARVAE MIDDLETON. 6 



Periclista luurtfeldtiae and infrequens, but differs from these, which 

 have spines black tipped or black at base and tip, in that the spines 

 are pale. It agrees very well with the supplementary description of 

 caryicola (sic: calricolum^)^ which records that species as possessing 

 spines " nearly normally furcate and others perfectly normal," al- 

 though they are described as more or less degenerate in the last stage 

 (VI). Periclista hicoriae and caryicola are further associated l^y 

 the use of the same host — hickory. 

 Larva. — Stage VI? (Specimen in poor condition.) 

 Size. — Length, 13 mm., maximum breadth at metathorax 2.25 mm. 

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

 6 spines in a transverse row; labrum with about 12 spines; epicra- 





Fig. 1. — Periclista hicoeiae Kohwer. 



Maxilla; 6, third urith. 



nium and frons moderately spined; antennae of the telescopic type 

 with 6 joints; eye disks not elevated, eyes slightly convex; maxilla 

 with palpifer and 4 jointed palpus, lacinia broad and flattened and 

 with a few (6) setae arranged on apical margin (fig. 1^) ; labium 

 with palpiger and 2-jointed palpus. Thorax: with large spines; legs 

 with 4 joints and an apical claw, joints moderately haired, joint 3 

 with small chitinous process at apex of inner side. Abdomen : Uro- 

 pods on urites 2-8, and postpedes on urite 10, (urites 4 and 10 

 chosen for describing because condition of the larvae would not per- 

 mit complete study); tergum; composed of A, B, C (C inclined 

 to subdivision into C^--) and D; B and C^ armed with large bifur- 

 cate spines, B in subdorsal, laterodorsal and supraalar regions, C'^ in 

 subdorsal and laterodorsal regions, on urites 1-9 (Fig. l**) ; urite 10, 

 epiproct with many large spines; spiracular area rather small, with 



» Dyar, Journ. N. Y. Ent. Soc, vol. 6, June, 1898, p. 135. 



