March 189-.] DyAR : LiFE-HlSTORIES OF N. Y. SlUG CATERPILLARS. 3 



Criticism of Previous Descriptions. 

 Dr. Packard's description is the only one of importance. His fig- 

 ure of Stage I is not drawn in a detailed manner, many of the setge being 

 omitted or incorrectly drawn. The description is like the figure, but is 

 not corroborated by my observations. I think the setae at the extremi- 

 ties were not carefully examined, and the spiracles have been put in in 

 the wrong place. The lowest row of short setae in the figure probably 

 represents the subventral row, not shown in my figure (Plate I, Fig. i) 

 and the spiracles should be above it. Besides stage I, Dr. Packard de- 

 scribes the last three stages, V, VI and YII (marked III?, IV? and 

 "last stage"). I find the descriptions excellent. The dorsal and 

 lateral depressed spaces are quite fully described and located, though 

 the upper segmental lateral (3) are said to be situated " on a suture "* 

 which is not the case. I also object to the centers of the dorsal depres- 

 sions (i) being called warts, and the broken yellow line along the lat- 

 eral ridge being described in the same series as the lateral depressed 

 spaces. f 



Description of the Several Stages in Detail. 



£^g. — Elliptical, narrower than usual, not greatly flattened, the 

 upper surface arched ; size .7 > .5 mm., height about .2 mm. and there- 

 fore unusually high in proportion. Reticulations obscure, irregularly 

 hexagonal, linear. Color whitish translucent with a very faint yellow 

 tint. They hatch in eight days. 



Sfage I. (Plate I, Fig. i). — Head whitish, eye black, mouth brown. 

 Body highest at joints 3-4, rather square. Sette arranged as in Apoda 

 y-inversa and with the same structure, colorless. Body all whitish, 

 without marks. The subdorsal setae on joints 5, 7, 9 and 11 lean out, 

 alternating with the others ; all have expanded cleft tips, the subdorsals 

 on joints 4 to 12 with a short spur near the base. The lateral setae on 

 joint 5 leans upward more than the others. After eating, the blood be- 

 comes pale green and the dark alimentary canal shows by transparency. 

 Length .7 to i.i mm. 



Stage II. — Elliptical, tail squarish ; dorsal space broad, lateral 

 moderate, subventral small ; ridges prominent, tubercular ; two setae on 



* " On each of the lateral slopes of the plateau are four rows of lemon yellow 

 spots, the highest and first being a row of minute transverse spots situated on the 

 suture." 



f " TVq fourth ro-cv is on the margin of the body, and is a broken series of short 

 lines." 



