proboscis (Ifala) with which the sweet juices of plants are taken up. ' This is marked by a great number 
of transverse lines and beset with numerous hairs. On each side are the jointed labial palpi or feelers, 
while still more externally come the trowel-like maxilla?, which being concave inwards are used sometimes 
to ensheath the more delicate proboscis to enable it to penetrate into the depths of flowers, at other times 
perhaps to aid in smoothing and finishing the wax cells of the honey comb. 
No. 8. Buccal organs of Dragon-fly ( Calopteryx ) magnified 40 diameters. Negative No. 520. new 
series. This photograph exhibits the formidable toothed mandibles of this carniverous" insect. 
No 9. Ovipositor of Saw-fly ( Cimbex Americana) magnified 80 diameters. Negative No. 512, new 
series. The Saw flies, with their curious saw-like ovipositors, make slits in the leaves of shrubs and trees 
and there deposit their eggs. In several genera of these flies the deposition of the egg is followed by the 
development of a gall-like excrescence on the leaf in which the larva is hatched out. 
No 10. \oung Spider (not identified) magnified 38 diameters. Negative No. 520, new series. This 
picture simply gives a general view of the conformation of a minute spider, showing the palpi, eiirht le^s 
and body, all well covered with bristle-like hairs. 
No. 11. Portion of the Buccal organs of a Spider magnified 19 diameters. Negative No. 51 0. new 
senes. Below are seen the two powerful mandibles, each consisting of two joints, the lower being a 
crooked claw through which the secretion of a poison glaud passes into any thing transfixed; above are 
the curved hairy maxillary palpi or feelers. On the right is seen one of the palpi of a second head 
mounted in the same preparation. 
I have the honor to be. Ueneral, 
Very respectfully, 
Your obedient servant, 
J. J. WOODWARD, 
Assistant Surgeon, U. S. Army. 
