1886.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 421 



me that the larvte are sometimes so abundant as to defoliate the trees 

 of some of their cities, and he speaks of them as a very large green, 

 spinous caterpillar. 



A. Orizaba Westw., Anu. Nat. Hist., 2qc1 ser., xv, 2»4 (Saturnia) Wlk., C. B. M., v, 1201 



(Attacus). 



This species resembles splendida very closely in color and macula- 

 tion — so closely indeed, that it is a matter of some difiBculty to find any 

 distinctive features. No male that was available for purposes of dis- 

 section was at hand, though I had several beautiful specimens under 

 examination. The venation is exactly like that of splendida. The only 

 permanent or apparently constant differences that I can find, are that 

 the primaries of the S are not so distinctly falcate, and the seconda- 

 ries are not so lengthily extended;' and that the vitreous sjjots are 

 shorter and broader on primaries and do not indent the t. p. line, and 

 on secondaries are more nearly obovate, the base being rounded or 

 convex instead of straight. M. Keumoegen claims (Ent. Am., i, p. 80) 

 that the species is identical with splendidus, but I should hesitate to 

 declare it so without a little more positive evidence. Other characters 

 that are more or less inconstant are that the black spot near the apex 

 is always divided into three — the line through the pale terminal space 

 is always distinctly black, and the secondaries have the spots within 

 this line much longer and deep black, often maculate also with deep 

 carmine. 



This form has not to my knowledge been found within our borders, 

 and is introduced merely because of its close resemblance to the pre- 

 ceding, and because it has been suggested tliat it was identical with 

 cincfns. 



A. cinctus Tepper, Bull. Bklu. Ent. Soc, v, 65, pi. figs. 1 and 2. 



This species has the same colors and essentially the same markings 

 as Orizaba or splendidus, but is decidedly distinct. It is a much smaller 

 species, expanding not more than 4.^ inches, and the wings are not 

 so produced in the $ . The white band is broader, more conspicuously 

 lunulate, that on the anterior wing somewhat curved outwardly, and 

 the lunations extend to the costa, whereas in orizaha they do not extend 

 above the vitreous spot. The vitreous spots themselves are smaller, 

 not reaching the white band on the primaries, and they are there in 

 shape most nearly like an equilateral triangle — they are rather broadly 

 edged with white and beyond that with black. Tbe vitreous spot of 

 secondaries is obovate in shape, very like that of orizaha but the white 

 margin is heavier. I have seen all the specimens known of this species, 

 and find tbese differences constant. However, there is yet one other 

 character that I count as decisive. The primaries have 10 veins in- 

 stead of 9. Vein 8 forks just before the apex, and there is no connection 

 between 8 and 10 (0 in orizaha). This feature is constant, and of spe- 

 cific value. I have had no males that I could examine closely enough 



