ORGANS FOUND ON THE HALTERES AND WINGS OF INSECTS. 145 
EXPLANATION OF THE PLATES. 
(All the figures are magnified.) 
Tap. XXVII. 
. Preparation from the wing of a Longicorn Beetle (Strangalia elongata), showing the subcostal 
nervure giving off branches passing to the vesicles: å, trachea; n, subcostal nervure. 
Elytron of Melolontha vulgaris: t, trachea; n, nervure ; à, portion more highly magnified, showing 
the termination of the nerves. 
4 | Tas. XXVIII. 
. Portion of the elytron of a species of Carabus: a a, trachea; b b, nerves proceeding to papillæ ; 
c c, markings in elytron, probably solid between upper and under wall. 
Portion of anterior wing of Ophion luteus: a, base of subcostal nervure, upper side; 5, end of 
nervure; €, under side of nervure. 
. Tenthredo viridis. A, portion of anterior wing; a, upper, b, under side. B, portion of posterior 
wing; a, upper, b, under side. C, section of wall of nervure through the organs; diameter at 
su rface zyngth of an inch. 
VOL. XXII. 4 U 
