A) 
Bae i 
r 
548 Generat Notes. [May, 
goderma, but it is safe to assume from what is known, in these 
respects, of allied species, that in both the instances here referred 
to, but particularly in the case of Trogoderma, development was 
retarded by insufficient nutrition and that the frequent molti 
and slow growth resulted therefrom and were correlated.—C. Y 
Riley. 
OVIPOSITING oF DIPLAX RUBICUNDULA.'— During the first week of 
October I had an excellent opportunity of watching the egg-lay- 
ing of this handsome little dragon-fly. They were quite abundant 
in a small artificial pond, whose banks were of rock, extending 
about two feet above the surface of the water. A little before noon 
they appear flying over the water coupled in the peculiar manner so 
well known in the dragon flies. As soon as fertilization has been 
accomplished, and while still held together, the female begins to 
deposit the eggs. The pair hover close to the surface of the 
water, and within a few inches of the bank. In this position the 
female dips the extremity of her abdomen slightly into the water; 
then both flying forward, the abdominal end of the female is 
curved strongly forward so as to strike the vertical surface of the 
bank just at the same time as the head of the male strikes it. 
These movements of wetting the tip of the abdomen and deposit- 
ing the eggs alternate with great rapidity. Sometimes the water 
is not fairly reached the first time trying; in which case the dip- 
ping is repeated. Similarly the egg-laying movements are some 
times repeated ; apparently, because the first movement was not 
successful. ; : 
e eggs are so glutinous that they adhere very easily. oe 
number layed with each movement varies. Sometimes there isb 
one; more frequently there are more. At first they are pai 
vertical wall of rock was found to be very thickly ¢ 
them.—Professor W. A. Buckhout, State College, Pa. 
A SMALL BELOSTOMA CAPTURES A Fisu.—In examining eo 
small stream in Dakota last August, to see whether it was pm 
ble for my buggy, I pushed aside the weeds growing at pe 
of the water and saw a strange sight. A Belostoma a h 
fourths of an inch long seemed to have just vanquishe “The é 
three or four times its own length, and like a dace in ne me 
bug, when first seen, was on the fish near the tail. The per i 
gling feebly, turned over on its side and the bug craie D R 
to its throat and apparently pierced it with its bill, and ‘ohether 
appeared in a thicket of fallen weeds lying in the i 4 
by the slight struggles of the fish or the strength of í eral 
cannot say. All this occupied but little time, and being y 
1 Compare also the process as observed in Perithemis Bimini E Packard, , 
Diplax in “ Embryological Studies on Diplax, Perithemis,” etc. 
Jr. Memoirs Peabody Academy of Science, Salem, 1 871,—Zd. 
