58 Journal New York Entomological Society. [Voi. v. 



Fortn interjecta. A row of green dots connects the basal and subapical green 

 marks (plate III, fig. 3, right wing). 



Form viridiclava. The green forms a continuous band, bordering the cell, 

 notched on the outer side (plate III, fig. 4). 



Form elliotii. The green band encroaches on the cell, or even surrounds the 

 discal dot (plate III, fig 5). 



Synopsis of Varieties of the Larva. 



Form A. — Flesh colored, horns and ridges bright red shading to pinkish ; black 

 lines all present, waved, confluent, forming irregular areas about the glandular dots; 

 no quadrate spots; often no detachable spines (plate III, fig. 9). 



Form B. — Sordid purplish, the black lines shaded ; horns and ridge broadly 

 bright ferruginous, broken on the interspaces, 6-7, 9-10 and 11-12 by quadrate dark 

 brown spots. 



Form C. — Dorsum sordid purplish, sides green; marks as in form B (plate III, 

 fig. 6). 



Form D. — Green, the black lines faint; horns and ridge yellow, broken by 

 quadrate spots as in form B (plate III, fig. 8;. 



Form E. — Green, the ridge and horns red ; quadrate brown spots on joints 3-4, 

 4-5, 6-7, 9-10 and 11-12 (plate III, fig. 7). 



Special Structural Characiers. 



These characters have been already given for the Florida form (see 

 Journal N. Y. Ent. See, iv, 125). In the New York forms there are 

 usually no caltrope patches on the subdorsal horns of joint 13. The 

 patch on the lateral horn of joint 1 2 is present when there is only one 

 pair of detachable spines (on joint 13), but absent when the second 

 pair is present, and even absent in stage vii, before the spines have ap- 

 peared, so that it may be determined in this stage whether there will be- 

 one or two spine patches. The second pair of spine patches appears 

 above this horn (lateral of joint 12) and replaces the caltropes function- 

 ally ; but probably the spines are not homologous with caltropes as we 

 formerly supposed (Journal, iv, 3, foot note) since both may be present 

 on the same horn and the caltropes abruptly disappear before the spines, 

 not being converted into them. 



Our larvae do not hide by day so persistently as the Florida form, 

 though the habit is present in some degree. 



Affinities, Habits, etc. 



The range of variation in the moths as they occur in New York is 



illustrated on the plate (figs, i to 5). The variation of the amount of 



green on the fore-wings is from delphinii, the minimum, to elliotii, the 



maximum. The ground color also varies from dark ferruginous brown 



