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color. These markings, when all present, consist of a broad longi- 

 tudinal band between the median and sub-median vein, two 

 transverse bands, which may be called the sub-basal and median 

 bands, and the terminal mark like the letter B with the upright 

 stroke towards the base of the wing. The veins are also of the 

 same color. On the secondaries, which are red inclining to orange, 

 we have a marginal series of black spots, a sub-marginal series of 

 four, one on the discal vein and two sub-basal spots, those on 

 the costa and outer margin partially fused together so as to be- 

 come what I designate below as sub-macular. 



Now, on the primaries the veins are sometimes entirely 

 black. Sometimes the basal band is absent and sometimes the 

 upright stroke of the B, in which case the end of the wing re- 

 minds us of A. virgunciila. On the secondaries the spots may be 

 either small and distinctly macular, partially fused ( = sub-macu- 

 lar) or entirely fused, leaving only an irregular discal patch of 

 greatly reduced dimensions. 



Finally, the secondaries may be yellow*instead of red. The 

 body parts alone appear of permanent color. I fonnerly de- 

 scribed the yellow form as var. ochracea. The following table 

 shows the distinct forms with which I am acquainted : 



* Secondaries orange-red, macular ; 

 a Prinaaries with black veins ; 



t both bands present ^ $ I 



a a Primaries with pale veins ; 



t both bands present $ ? 2 



* * Secondaries orange-red, sub-macular; 



t both bands present ^ — 3 



t t basal band absent $ — 4 



* * * Secondaries orange-red, sufifused ; 



t both bands present , $ ? 5 



t t basal band absent S - - 6 



t t t upright of " B " absent $ — 7 



* * * * Secondaries yellow, macular ; 



t both bands present — ? 8 



***** Secondaries yellow, sub-macular ; 



t both bands present $ — 9 



****** Secondaries yellow, suffused ; 



t basal band absent ^ — lo 



In form 7 the secondaries might be called either red or 

 yellow, the color being doubtful. We are thus confronted with 

 a case in which neither color nor markings can be relied upon to 

 decide what constitutes a species, while at the same time the 

 general appearance of the insect is very characteristic. 



The same difficulty exists in the species, the different forms 

 of which have been described as A. docta, A. Mexicana, A. Au- 

 tholea and A. Arizoniensis, in which the secondaries of the female 

 are red with black spots, and those of the male white, sometimes 

 spotted and sometimes immaculate, while the primaries in some 

 forms can only be described by locating the position of the spots, 



