212 
[October 
case in the Uhlerian specimen. The Monorjraphie describes the epis- 
toma as “ bronze-green,” the top of the head as “ golden-green and 
the thorax as coppery-green in front” and “ hronze-green” on its 
sides. In Dr. Hagen’s Synopsis the general color of % is said to be 
coppery.” In the above-quoted two species (nipamnensis and pseud- 
americana) I find the coloration in these parts to be very variable. 
As is also the case in the Uhlerian specimen of americana, the postoc- 
cipital tubercles of this specimen are obtuse, which character however 
is omitted in Monograpliie. —Antecubitals 25—26 ; postcubitals 
25—27 ; 9—13 cross-veins to the 4 quadrilaterals; 6—8 cross-veins to 
the 4 basal areas. Length % 47 mill. Expanse % 58 mill. Abd. % 
38 mill. Front wing S 30J mill. Hind wing % 29 mill. One % ; 9 
unknown. Very rare near Rock Island, III. A search of several 
weeks for the 9 of this species, and also for additional % specimens, was 
finally unsuccessful. 
A new species of Iletasriua, basalis Hagen, is briefly described b}' 
its differences from eimericana in M. Selys’s Addit. Synops. Calopt. p. 
6. (where however the habitat should be “ Pecos River, Texas in¬ 
stead of “ Pecos River, High California^'’^ and also in Hagen’s Sy¬ 
nopsis p. 60. As in that species the basal spot is said to extend 4 of 
the way to the nodus instead of only 1 the way as in americana^ it 
might be thought that our insect, whose basal spot extends about f the 
way to the nodus, should be referred there. But. Isi'. in hasalis the 
basal spot is said to be more convex exteriorly than in amerieana, 
which is not the case here, and 'Ind. the superior % abdominal appen¬ 
dages of hascdis are said to have the middle tooth “triangular,’’ whereas 
according to the figure and description in the Monog}'ap)hie the middle 
tooth in americana is “rounded” in a regular curve, as in my % . 
Amongst the debris of a number of specimens of Hetaerina sent me by 
Mr. Uhler, some of which were labelled “ basalis Hagen, Texas,” I find 
an abdomen with just such a triangular tooth on the % abdominal ap¬ 
pendage, In a word, this character of the tooth is structural and there¬ 
fore as a general rule more important; the characters drawn from the 
spot are merely colorational, and are not, therefore, as a general rule, 
either so reliable or so important. 
But besides this last distinction it is important to observe, that 
