ORGANS FOUND ON THE HALTERES AND WINGS OF INSECTS. 145 



EXPLANATION OP THE PLATES. 

 (All the figures are magnified.) 



Tab. XXVII. 



Fig. 1. Preparation from the wing of a Longicorn Beetle {Strangalia ekmgata), showing the subcostal 

 nervure giving off branches passing to the vesicles : t, trachea ; n, subcostal nervure. 



Fig. 2. Elytron of Melolontha vulgaris : t, trachea ; n, nervure ; b, portion more highly magnified, showing 

 the termination of the nerves. 



Tab. XXVIII. 



Fig. 1 . Portion of the elytron of a species of Carabus : a a, trachea ; b b, nerves proceeding to papillae ; 



c c, markings in elytron, probably solid between upper and under wall. 

 Fig. 2. Portion of anterior wing of Ophion luteus: a, base of subcostal nervure, upper side; b, end of 



nervure ; c, under side of nervure. 

 Fig. 3. 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 ^cTjijth of an inch. 



VOL. XXII. 



