1910] A Structural Study of Some Caterpillars 131 



PLATE XVII. 

 Lacosomidae. 



Fig. 93. Venlral view of proleg of half-grown Lacosoma chiridota. 

 Fig. 9-1 and 95. Lower lip and head of L. chiridota. 



Thaumetopoeidae. 



Fig. 96 and 97. Labrum and claw of true leg of Thaumetopoea (Cnethocampa; 

 pityocampa. 



• Lymantriidae. 



Fig. 98. Front and labrum of Hemerocampa leucostigma. 

 I'lG. 99. Labrum of Euproctis chrysorrhea. 



NOCTUIDAE. 



l"iG. 100. Head of Demas coryli. 



Fig. 101. Tip of true leg of D. coryli. The moderately notched claw, and the 



three spatulate setae are typical, Vjut not universal in the Macro- 



lepidoptera. 

 Fig. 102 to lOo. Labra of various species of Acronycta, to show variation within 



the genus. 

 Fig. 100. Labrum of Arsilonche henrici. 

 Fig. 107. Head of Hadena (Trachea) turbulenta. 

 Fig. 108. Head of Feltia sp. 

 Fig. 109. Part of head of Euxoa sp. 

 I'iG. 110. Front of Cucullia sp. 



Fig. 111. The ocelli of Xycteola revayana. (Right side). 

 Fig. 11 J. The ocelli of Earias chlorana. 



PLATE XVIII. 



Arctiidae. 



I'lG 113. Head of Apantesis parthenice (?); the setae are somewhat shorter 



than in life, but not so much so as in most of the figures of heads 



in this paper. 

 l"iG. 114. Head of Isia Isabella. 



Fig. 1 15. Mandible of the same, seen from the inner aspect. 

 Fig. 116. Mandible of Apantesis. (Of the opposite side). 

 Fig. 117. I'ront and labrum of Euchaetias egle. 

 I'iG. 118. Lower lip of E. egle. 



Fig. 119 and 120. Front and labrum more enlarged of Halesidota caryae. 

 Fig. 121. LaVjrum of Isia isabclla. 



.Syntomidae. 

 F""ig. 122. Labrum of Ctenucha virginica. 



Megalopygidae, 

 i'lG. 123. Lower lip of Lagoa crispata. 

 Fig. 124. Antenna of L. crispata (seen from the ventral side). 



PLATE XIX. I 



Fig. 125. Labrum of Lagoa crispata. 

 Fig. 126. Half of the same, more enlarged. 



Microlepidoptera. 

 Fig. 127. Front view of head of Psyche zelleri. 



Fig. 128. Ventral view of proleg of Thyridopteryx ephemeraeformis. 

 Fig. 129. Sketch of lower lip of Cossus cossus, showing the general arrangement 

 and proportions of parts. 



