THE GRAPE-LEAF SKELETON IZER. 



83 



Sixth instar {fidl-(ji'oa'ii larva) (fig. 14). — Cylindrical and uniform 

 in shape, color deep s^llphur-yello^Y. Head oval-pyramidal in form, 

 dark brown, lighter above, retractile, concealed beneath first pro- 

 thoracic segment. Mandibles and maxilhv dark brown, maxillary 

 palpi yellow, translucent, eyes black. Tubercles flat, wartlike areas, 

 appearing to naked eye as a transverse, me- 

 dian row of black dots. Under a g-inch 

 objective, tubercles wartlike, covered with 

 short, thick, segmented, white bristles tipped 

 with black, joints and bulb at base of bris- 

 tles dark colored (length, 0.20-0.33 mm.). 

 Tubercles arranged: I, subdorsal: TI and 

 III, lateral: III, just above spiracle; IV, 

 substigmatal: V, above base of leg. Sub- 

 dorsal tubercles confiuent on segment 2. 

 Segments 5-14 Avith tubercle III wanting, 

 segments 7-14 with tubercle V wanting, 

 subdorsal and lateral tubercles confluent on 

 segment 13. subdorsal tubercle confluent on 

 segment 14. the rest wanting. Anterior and 

 posterior segments dorsally and all segments 

 laterally with a number of long, whitish, 

 segmented hairs, variable in length. Spiracles round, light brown, 

 present on first prothoraci(; and on all abdominal segments except 

 anal, the one on segment 13 smaller than the rest. Thoracic feet 

 translucent, yellow, small, pointed, with a single black claw at ti]> 

 and also a few light-colored hairs on sides. Abdominal 

 feet pale yellow, apex with a row of small, black, bristle- 

 like claws. Length, 11-13.5 mm.; width of head, 1.483- 

 1.G6G mm. (variable). 



cocoox. 



Cocoon (fig. 15) flat, oblong-oval in shape, composed of 

 a tough, white, cottony, parchmentlike material, opaque 

 when dry. but showing pupa underneath when Avet. 

 Fig. 16. —The Length. 10-12 mm.; width. 5 mm. 



g r a p e - 1 e a f 



I'ic. 15.— The grape-leaf skol- 

 (tonizor { llnrrisaiifi ameri- 

 coiia) : Cocoon. Enlarged. 

 (Original.) 



sk eletonizer 

 (Ihirr ixana 

 amcricana): 

 1' u p a . En- 

 larged. (Orig- 

 inal.) 



PUPA. 



Pupa (fig. IC)) uniformly orange-colored in fresh speci- 

 mens, brown in older ones; oblong-oval, broadest at 

 abdominal .segments 3. 4. and 5. Eyes and spiracles 

 darker than rest of body. Spiracles raised wartlike projections, sub- 

 conical in shape, eight j)airs. the eighth pair the longest. Spiracles 

 arranged on latero-dorsal aspect of abdominal segments 2-9. Ante- 



