Vm EXPLANATION OF PLATES. 



Fig. 2. Dicrorampha sequana, a small moth of the blunt-winged group of the 

 Tortricina. (Natural size.) 



Fig. 3. A, Salias prasinana, the common Silverlines Moth ; b, a callosity 

 running along the under side of the inner edge of the f^rewing at its base 

 before the elbow, that locks the unexpanded forewings to a side piece of the 

 metathorax, /. The moth is musical, and stridulates on the wing. 



Fig. 4. Shows the filing on the inner surface of the lower joint of the labial 

 paljDi, I, and the appearance of the adjacent surface of the proboscis, s (magnified) ; 

 by the mutual friction of which Acherontia atropos, the Death's-head Moth, pro- 

 duces its squeak. 



Fig. 5. Bombus lapponlcus, a bee common to Europe and North America. 

 Fig. 6. Organ of audition of Catacala Nupta, the Red Underwing Moth. 

 a, Entrance of the ear, closed inwardly by a tender iridiscent membrane, m, 

 representing the membranum tympanum. Within the tympanum or drum is a 

 second acoustic chamber, b, in which is observed an inflated membrane, attached 

 to the tympanum by two arms, one of which takes its rise from a horny piece 

 on the margin ; from the other end of this vesicle proceeds the acoustic nerve, n. 

 There is an interior chamber, c, parted from b by an oval iridescent membrane, 

 and a thii-d most interior, d. A tube answering to the Eustachian communicates 

 air to the cells, c, d, b, successively, counteracting the atmospheric pressure on 

 the tender tympanum, m. In Fig. 8 of Plate V. are seen the external openings 

 of the ear and Eustachian tube, e, in situ. (Highly magnified.) 

 Fig. 7. Scriconu/a borealis, a Hover-fly. 



Fig. 8. The Death's-head Moth, Acherontia Atropos. I, Lima ; s, clasp. 

 Fig. 9. Another preparation of the lepidoi^terous ear, like the preceding, 

 highly magnified ; introduced to show its accessories in Xylophasia polyodon, the 

 common Dark Arches Moth, and in most of the Noctnina; a, c, d, m, as before; 

 e, e, two large air-bladders communicating with the trachese, into which the 

 exterior boundary, b, of the auditory apparatus projects ; m, m', are two irides-, 

 cent membranes in the common partition of the chambers, c ; and separating ^ 

 the chambers or cells, b, c (Fig. 6) ; w, is a little projecting piece, protecting the 

 meatus externus, or entry of the ear; v, a movable membranous valve; e, shows 

 the course of the counterpart of the Eustachian tube ; /, fan of the male moth ; 

 r, its containing fold. 



Fig. 10. The Lily Beetle, Crioceris merdigcra. a. The coleopteron ; b, the 

 same magnified to show the musical apparatus ; I, abdominal lima ; s, elytral 

 clasp. 



Fig. II. Shows the singular vesicle beneath the hind femora in Chelonia 

 pudica, a musical moth. /, Strias and raised impressions on its membrane; 

 «, femur. 



Fig. 12. Vanessa lo, the Peacock Butterfly. 



Fig. 13. Coranus subapterns, covered with dust, s, Eostrum and its striated 

 groove. 



PLATE V. 



ORGANS OF VOCAL MUSIC IN DIPTERA AND HYMENOPTERA, ANTICS OF A DIPTERON 

 SEXUAL SECRETIONS OF LEPIDOPTERA, ETC. 



Fig. I. Love and rivalry, traits in the biology of Bolichopua mbilitatis a 

 little fly. 



Fig. 2. A, Stridulating organ of Clytus arietis, a Longhom Beetle ; m, m, 



