30 BULLETIN 48, UNITED STATES NATIONAL MUSEUM.' 



and here the dihitiou is exceedingly slight and not liable to canse eon- 

 tiision. 



Z. Ifvrigata and Z. punctiformh are i)eculiar in this series by the 

 character of the subtenninal line, which is sinnate, and this character 

 will serve to distinguish the former through all its protean changes of 

 color. Only one other of the Deltoid series api)roaches this in varia- 

 bility — Renia discoloralis — and that is, of course, impossible to con- 

 fuse with either of the above. In ground color Z. livvigata may vai-y 

 from carneous gray to almost black, and the color may be even or 

 powdery; the i)rimaries may have the median space contrastingly red, 

 or brown, or yellowish, or gray; or this space may be dark, w^hile all 

 else is contrastingly i)aler. A good series of this species is in itself a 

 lesson in insect variation, and yet with all this change in coh)r there is 

 l)ractically no variation in tln^ markings, i. e., the conise of the ordinary 

 lilies. It is probalde that under the term Z. ohsoUia 1 liaveredescribed 

 ;in almost immaculate form of this species. 



Z. punctiforinis, which at Hrst sight resembles Z. Uvviiiata quite 

 strongly, has the transverse anterior line outcurved, wiiile in its ally it 

 18 rigid, and the subtenninal line is pale and somewhat hmulate, each 

 liinule preceded by a black si)ot, which is inwardly diffuse. 



Z. atriUneeUa is also distinctive in appearance, and is allied to Z. Uvvi- 

 fjdta, though much smaller, and probably abundantly distinct. It is 

 characterized by the prominent black median lines, the inner quite 

 diffuse, and by the black shade preceding the subtenninal line. 

 Unfortunately a single imi)erfect specimen only is known, and there 

 is no information as to whether we have a normal form, or one that is an 

 extreme variation. I deem it not unlikely that Z. livvigata may some- 

 times take on a similar api)earance; but do not mean to suggest any 

 specific relation between the two. 



In all the following species tlie subtenninal line is even and straight; 

 usually it is pale, and in many instances preceded by a dusky shade. 



Z. pnJijyUalis is a luteous gray form and differs from all its neighbors 

 in that the subtenninal line is dusky and only occasionally followed by 

 a vague i^aler line. It is also abbreviated below the apex and does not 

 reach the costa, terminating in such a way as to make it appear that 

 its continuation would reach the extreme tip of the wing, where a 

 dusky dot intensities this impression. The transverse posterior line is 

 usually quite distinctly angulated over the cell, and the transverse 

 anterior line is even, not denticulated. The i)e(*uliar course of the 

 subterminariine adds to the impression that the fore wing is more 

 pointed than is really the case. 



Z. cniralis is allied to Z. ped'rpUalis^ but is brown, and the subtenni- 

 nal line is pale, preceded by a distinct dark shade, reaching the costa 

 without break. The transverse anterior line is even, and the trans- 

 verse posterior line less angulated over the cell: but it has a more dis- 

 tinct incurve in the submedian interspace. 



