iQio] A Structural Study of Some Caterpillars 129. 



PLATE XII. 



Fig. 26. Tip of left maxilla of a Noctuid caterpillar, caudal aspect. 



iv and V, setae of second segment of palpus. 



palp. 1, First free segment of palpus. 



2, Second free segment of palpus. 



base, Basal segment of galea. 



mx. I., Maxillary lobes. 



I. C; Inner large cone, the outer one is behind the outer maxillary 

 lobe. 



5^ c, Step cone. 



5. c, Small cone. The inner one is in front of the inner maxillary lobe. 

 Fig. 27. Tip of maxilla of Hepialus (Jugatae), caudal aspect. 

 Fig. 28. A typical mandible (Phlegethontius quinquemaculatus, side view of 



right mandible). 

 Fig. 29. A typical antenna (Diacrisia virginica), side view of right antenna. 



(The long seta is posterior). 

 Fig. 30. Arrangement of eyes of right side in the Jugatae (Hepialus hectus). 

 Fig. 31. Arrangement of eyes of right side in the Frenats (Demas coryli). 

 Fig. 32. Maxilla and labium of a sawfly. The right maxilla is not shown. The 

 part of the maxilla covered by the labium is indicated in dotted 

 lines. 

 Fig. 33. Seta plan of middle abdominal segment of Hepialus hectus; compare 



Figs. 4 and 5. 

 Fig. 34. Same of Incurvaria, showing also the dorsal and ventral sclerites. 

 Fig. 35. Ventral view of pro- and mesothorax of Adela. 



St., Sternum. 



Cx., Coxa. 



F., Femur. 



T., Tibia. 



ir., Trochanter. 



PLATE XIII. 



Fig. 36. Labium and ma.xillae of Basilarchia di.sippus. The drawings of lower 

 lips were made with the camera lucida, and they are drawn as they 

 appeared in the prepared specimens. They are usually somewhat 

 retracted, on one or both sides. In life the labium is usually folded 

 so that the spinneret lies at right angles to the rest, and the base- 

 of the spinneret and the setae ai at least, are concealed. 



FlG. ?Pl . Labrum of Libythea celtis, on the same scale as the other butterfly labra^ 



Fig. 38. Labrum of Thella ilicis. 



Sphingidae. 



Fig. 39. 40 and 41. Head, labrum and lower lip of Dolba hylaeus (?). 



Fig. 42. Sketch of head of Paonias myops, to show the form. 



Fig. 43 and 44. Front and labrum more enlarged. 



Fig. 45. Head of Ceratomia amyntor. 



Fig. 46. Head of Deilephila gallii. 



Fig. 27. Head of Pseudosphin.x tetrio. 



PLATE Xn'. 



Fig. 48 and 53. Head and labrum of Amphion nessus. 



Fig. 49. Labrum of Ceratomia amyntor. 



Fig. 50. Labrum of Pseudosphinx tetrio. 



Fig. 51. Labrum of Phlegethontius Carolina. 



Fig. 52. Labrum of Deilephila gallii. 



Fig. 54, 55 and 56. Head labrum and lower lip of Apatelodes torrefacta.. 



Endromidae. 

 Fig. 57. Labrum of Endromis versicolor. 



BOMBYCIDAE. 



Fig. 58. Labrum of Bombyx mori. 



