192 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



Length of a hind wing, 9 52 mm., including the tail, which is 21 mm. long and 5 mm. 

 wide in the middle. 



Breadth of hind wing, 9 24 mm. 

 Geographical distribution. — This form was collected at Polvon, occidental department, 

 West Nicaragua, near the Bay of Realejo, but inland between Corinto and Leon, near Cor- 

 cuera, by John A. McNiel. 



Whether this is even a local race peculiar to Nicaragua or not remains to be seen, when 

 more specimens are discovered; the tails vary greatly hi length, though it is noteworthy that 

 both truncatipennis and azteca occur hi Central America, forms in which there is so much diverg- 

 ence as regards the length of tail. 



(3) Tropaea truncatipennis Sonthonnax [Lep. Soie, II (1903), p. 19, PI. VII, Jalapa]; PI. L, 

 fig. 2. 

 One 3 , one 9 . This form differs in the smaller ocelli of both pairs of wings ; the ocelli 

 of the fore wings are so small that they do not reach vein IV. Beneath, the ocelli are notice- 

 ably smaller than in luna. The shape of the wings is also different from luna of Texas north- 

 ward, the fore wings being a third smaller and rounder, the hind wings being less rounded and 

 more elliptical. This is the chief and only tangible difference between the two forms. The 

 stalk, its size, shape, and coloration is just as in T. luna. The general hue is the usual delicate 

 pale pea-green shade, as seen hi most of the northern specimens. The outer edge of the wings 

 of both pairs is deep reddish pink. The hind wings are less scalloped than hi the normal 

 T. luna, and the fore wings tend to be slightly more falcate. There is, as in most of the exam- 

 ples of T. luna, no trace of an extradiscal band or line or any other markings. It is of the same 

 size, the same expanse of wings, and the legs and body as just as in T. luna. 

 Truncatipennis: 



Expanse of fore wings, 3 123 mm.; 9 126 mm. 



Length of fore wings, 3 60 mm.; 9 63 mm. 



Length of hind whig, including tail, 86 mm. 



Length from discal vem to tip of tail, 3 9 62-64 mm. 



Ocellus of fore, wing, 4 by 4.3 mm. 



Ocellus of hind whig, 4.3 by 5.5 mm. 

 Luna: 



Expanse of fore wings, 3 125 mm. 



Length of fore wings, 3 60 mm. 



Length of hind whig, including tail, 3 85 mm. 



Length from discal vein to tip of tail, 3 64 mm. 



Ocellus of fore wing, 3 5 to 5.2 by 4.5. 



Ocellus of hind wing, 3 5.6 by 5.1. 

 If these characters hold good hi a larger number of specimens, truncatipennis may safely 

 be regarded as a climatic variety of T. luna. 



[An apparently more recent note on T. truncatipennis, based on a female in the Godman- 

 Salvin collection (British Museum), from Jalapa, indicates that this is probably a valid species.] 

 Fore wings falcate, outer edge curved in, but no more so than in some 9 luna, which 

 varies much, some being falcate and others with outer edge not excavated at all. Hind wings 

 pointed at apex and outer edge not full, but straight and not scalloped. Outer edge of both 

 wings broadly margined with reddish brown (magenta?), but two of luna as much so. Tails a 

 little longer than hi luna; considerably longer than breadth of the hind wing. Third median 

 vein arises nearer base of wing than in luna. Venation of fore wing as in luna. Ocelli of fore 

 wing as in some luna, well pronounced, red, yellow, blue semicircle and black. Ocellus of hind 

 wing not so large as in some luna, but well marked; black is heavy, as is red, the yellow outer 

 portion is pale green, less ochreous than in Mexican (Orizaba) specimen. Outer edge and apex 

 of hind wing is less scalloped and more acute than in any luna. All four ocelli beneath are 

 larger than hi Orizaba luna and United States luna. It seems quite distinct from the Mexican 



