268 
[October 
surrounding space yellowisli.—Coupled with the colorational distinc¬ 
tions already noticed in the wing-spots and the pterostigma, (page 211,) 
these two structural differences are manifestly of specific value. In 
the second 'S americana received from Mr. Uhler, the carmine-red 
basal spot extends only 3—4 cellules beyond the quadrilateral in the 
front wing, and 1—li in the hind wing, instead of 5 and 3 as in the 
first S ; thus increasing still further the disparity in this character be¬ 
tween americana and scelerata^ where it extends 11—12 and 8—^9 cel¬ 
lules beyond the quadrilateral. The laminiform tooth of scelerata is 
shaped nearly as in pseudamericana^ but is much smaller, being only 
about 4 as wide at base as the appendage is long, instead of 4. 
Mr. Uhler, to whom I had communicated my observations on the 
whitishness of the principal sector beneath in pseudamericana and 
texana^ says that he “has captured many pairs of americana in copula, 
and that the teneral [or very immature] % has the underside of the 
principal sector very conspicuously whitish, just as in the teneral and 
less adult 9 . In this state the dorsum of the thorax and abdomen is 
bright emerald green S 9; in the adult S it is splendid coppery pur¬ 
ple and in the adult 9 olive-greenish. In the semi-adult % and the adult 
% 9 the principal sector inferiorly is brown, or at most not whitish. 
In the teneral % the pterostigma is whitish; in the adult S brown.”* 
—In the two % americana sent me by Mr. Uhler himself, which are 
both adult, the principal sector and the other veins described as yel¬ 
lowish white m pseudamericana^ are not “brown,” but hlack beneath, 
and they are described as black in the Monographic both in the adult 
% and the semi-adult % , (jeune % .) In the 9 americana recently 
received from Mr. Uhler, which is tolerably mature and has the dorsum 
of the thorax dark green, the principal sector &c., are reddish-brown 
beneath. In this 9 there are on the postcosta of the front wing only 
2—3 irregular ranks of cellules, instead of 3—5 as m pseudamericana 
9 ; and the front wing is 28 mill, long and 4| mill, wide at the nodus, 
instead of 32^ and 6, (or proportionally half a millimetre wider,) as in 
pseudamericana 9 . Hence the abnormal 9 referred above doubtingly 
•i"The description in Monogr. Calopt. (p. 133) says that the pterostigma of the 
adult ^ is “reddish brown/’ and that of the semi-adult % “yellow.” In the 
remarks following that'description, the % pterostigma is erroneously stated to 
be yellow,” without regard to age. 
