22 THE CANADIAN ENTOMOLOGIST. 
ceous tinge in the reniform spot is perceptible in all the specimens we have 
seen, in some quite bright, but in others exceedingly faint. The relative 
approximation of the ordinary spots varies so much in different individuals 
as to be of little distinctive value. The darker color of secondaries 1s, we : 
believe, more uniform, and is quite characteristic in most instances, but in 
several male specimens we have been unable to trace any difference in 
this respect. There are two other small points of distinction, not men- 
tioned by Mr. Grote, which we have thus far found invariable : in sé, the 
orbicular spot has a black border on the outer side ; in occidentalis, this 
is wanting, or scarcely perceptible, or otherwise replaced by a faint entire 
testaceous bordering. In sz, the inner black bordering of the reniform 
spot is double at its lower extremity, while in occidentalis we have never 
found it otherwise than single, and this much less distinct in most speci- 
mens. All these points of difference in the imago state, it must be 
admitted, are very slight and vague as compared with the striking dis- 
similarity of the insects in their respective larval forms. 
INSECTS OF THE NORTHERN PARTS OF BRITISH AMERICA. 
COMPILED BY THE EDITOR. 
From Kirbys Fauna Boreali-Americana: Insecta. 
(Continued from page 36.) 
27e TRACHYS ACUDUCTA Kirby.—Length of body 4 lines: .: Taken 
by Capt. Hall in Nova Scotia. 
[163.] Body oblong, punctured, hairy with scattered minute decum- 
bent bristles resembling little scales, of a bronzed and glossy copper 
colour. Front with a slight sinus: prothorax transverse, trilobed at the 
base ; disk longitudinally convex and naked ; sides hairy; surface in the 
disk covered with minute transverse undulated lines curving upwards, and 
sides reticulated with them: scutellum transverse acuminated : elytra 
uneven, constricted before the middle, clouded and obsoletely banded 
towards the apex with minute whitish bristles; tips rounded, serrulate : 
prosternum broad, a little constricted in the middle, rounded at the apex. — 
[1642]. FAMILY PYTHIDÆ. 
218. PyTHO NIGER K7rby.—Plate vii., fig. 2—lLength of body Bye 
572 lines. Several taken in Lat. 54°, and in the journey from New York 
to Cumberland-house. 
