1886.] Zoology. 815 
opposed in their diet, whilst other groups again, alike in their 
food, signally differ in their coloration.” r. Horn’s elaborate 
monograph of the species of Chrysobothris inhabiting the United 
States, gives the result of a great deal of labor, both with the 
e and pen; the plates are most excellent and rich in de- 
tails, 
ZOÖLOGY. 
ugitive character. Doubtless they are somehow connected with 
the function of secretion —G. M. 
ORcans oF Fricut.—M. P. C. Amans sums up an extensive 
survey of the organs of flight of the animal kingdom by distin- 
gushing two principal types of the machine—the insect and the 
vertebrate. In the former the principal part is formed by the 
meso and metathorax ; in each segment the endosternum forms 
the longitudinal axis of the floor ; the flanks are sustained by three 
vertical pieces, and the upper edge by two; the roof of each seg- 
ment is formed by two parts, which are concave below and with- 
out. The frame-work of the wing is formed by six prima 
nervures and their ramifications, which are alternately related to 
the sides or the roof ; the general form of the wing is that of a 
biplanar triangle, with the base centripetal and the apex centrifugal. 
€ base is formed of an anterior and a posterior plane, the latter 
Pieces as there are nervures. The apparatus of formation is con- 
sen and may be considered as consisting of an anterior piece, 
which forms a movable pivot, separated by an articular cavity 
to the articulations of the anterior and subanterior nervures with 
z- » . 
their basal 
scles. 
