NYMPIIAI.IXAK: POLYGONIA INTERROGATIONIS. 325 



slii^litly shorter and less produced, and tlie upper basal proc(;ss a little slenderer in 

 unil)rosa than in fabrlcii. 



Egg (64 : K;, 17). Considerably higher than l)road, somcwliat narrowed apically, 

 broadest below the middle, with nine to eleven, commonly ten, strongly compressed 

 riila;es, ijroAvinu; higiier toward the summit, where tluiy are nearly half as hi.^li as the 

 widtii of the interspaces at tiiat point; interspaces i^ently concave throuj^hout, broken 

 up 1)y very faint lines .025 nun. apart. Color (C. V. Uiley) at first dull bluish green, 

 afterward becoming grayisli green with silvery reflections, the ridges white. Height, 

 .!•.") mm.; breadtli, .7 nun. 



Caterpillar. First stage. Head (78 : 37) smooth, piceous with a bronze tinge, the 

 hairs and all appendages black; coronal papillae scarcely perceptible. Body ratlier 

 pale green, strongly tinged with ferruginous on posterior half, the anterior section of 

 the segments on anterior half pallid above the lateral line, setting off the papillae which 

 are everywhere brownish fuscous; hairs erect, black, generally bent in some part of 

 their course, the angle rounded; the inclination is not uniform, but is usually forward 

 on the laterodorsal row, forward on the laterostigmatal. Spiracles broAvnish fus- 

 cous. Legs and tips of prolegs ))lackish fuscous: rest of prolegs like ventral surface 

 of body, which is paler green and more uniform than above. Length of body, 3 mm. ; 

 breadth of head, .5 mm. 



Si'cnnd stagp. Head (78: 38) shining bronze black, the hemispheres surmounted 1)y 

 a compound tubercle, stouter and slightly shorter than those of the abdominal seg- 

 ments, all the hairs on the head arising from distinct papillae; all appendages black. 

 Body olive green, slenderly and inconspicuously streaked with pallid white in maculate 

 strigae which follow the lines of the spines; spines piceous, hairs blackish fuscous; 

 spines of second and third thoracic segments slightly larger than the others, all the rest 

 uniform, with subapical and extreme basal circlets of hair bearing papillae. Spira- 

 cles and prolegs color of body. Legs dark l)rownish fuscous. Length 0..") mm. ; 

 I)rcadth of head, .75 mm. 



Third stage. Head (78 : 39) shining bronze black, most of the papillae white, the 

 coronal spines with elongate papillae, all the hairs pallid. Body olive green, varying 

 in different individuals from rather light to very dark, distinctly strigate with white as 

 in preceding stage, the dorsal striga double ; dorsal and laterodorsal spines variable in 

 coloration, those of the third thoracic and second abdominal sometimes, of the fourth 

 and sixth abdominal segments generally, amber yellow, sometimes including and some- 

 times not, an annulus around the base of the spines ; the other spines are generally 

 black, sometimes tinged with olivaceous, occasionally pallid tipped ; the hairs and thorns 

 generally dark. Spiracles black with a distinct yellow annulus. Legs and outer side last 

 joint of prolegs black. Length, 13 mm. ; breadth of head, 1.35 mm. 



Fourth stage. Closely resembling the final stage, but with a darker head (78:40). 

 Length, 22 mm.; breadth of head, 2.25 mm. 



Fifth stage {1^:2?), 2'). Head (78:41) uniform in color, vai-ying from a fuscous 

 l)rown to a rather pale yellowish brown, the field of ocelli black; summit spine 

 stout at base and not long, the lateral spinules emitted below the middle, the basal 

 portion about as broad as long, the spinules moderately slender and rather shorter 

 tiian the apical portion of the main stem, which scarcely tapers. Body varying 

 from luteo-castaneous to rufo-castaneous, witli bro-id, but irregular dorsal, latero- 

 dorsal, laterostigmatal and ventrostigmatal, Ifiack or rich black-l)rown stripes, nar- 

 rowly and interruptedly edged, at least above the spiracles, with pale yelloAv or pallid, 

 sprinkled with ivory-white papillae (also found in the interspaces) and much broken 

 and obscured, especially on the dorsal half of the body, with irregular strigae and 

 blotches of pale yellow; on the thoracic segments the stripes are by this means, and 

 by the confluence of some of the black parts of adjoining stripes, completely oliliter- 

 ated as such, and irregular, much broken, transverse, black, vermicular strigae take their 

 place, anil here there is a distinct and regular pale yellow dorsal line; there is also a 

 rather slender, more or less interrupted and variable ventral stripe, and the bases of 

 the prolegs are heavily clouded with ))lack externally, merging into the veutrostigma- 



