NO. 2134. NORTH AMERICAN COLLEMBOLOUS INSECTS— FOL^OM. 523 



Plate 17. 



Fig. 127. Achorutes uniunguiculatus, eyes of left side, X 350. 



128. Achorutes uniunguiculatus, left postantennal organ, X 1230. 



129. Achorutes uniunguiculatus, sense organ of third antennal segment of left 



side, X 1230. 



130. Achorutes uniunguiculatus, right hind foot, X 8-40. 



131. Achorutes uniunguiculatus, left dens and mucro, X 350. 



132. Achorutes uniunguiculatus, left mucro, X 840. 



133. Achorutes uniunguiculatus, left mucro, X 840. 



134. Achorutes uniunguiculatus, anal spines, X 840. 



135. Achorutes uniunguiculatus, lateral aspect of left anal spine, X 1230. 



136. Achorutes uniunguiculatus, dorsal setao of first al)doniinaI segment, X 350. 



137. Xenijlla humicola, eyes of left side, X 268. 



138. Xenylla humicola, left fore foot, X 470. 



139. Xenylla humicola, left dens and mucro, X 260. 



140. Xenylla humicola, left mucro, X 1230. 



141. Xenylla humicola, left mucro, X 840. 



142. Xenylla humicola, anal spines, X 470. 



Plate 18. 



Fig. 143. Xenylla baconae, sense organ of third antennal segment of left side, X 1230. 



144. Xenylla haconae, right hind foot, X 840. 



145. Xenylla baconae, left aspect of furcula, X 260. 



146. Xenylla baconae, left mucro, X 840. 



147. Xenylla baconae, anal spines, X 350. 



148. Xenylla baconae, anal spine, X 810. 



149. Xenylla baconae, dorsal setae of mesonotum, X 260. 



150. Xenylla tvelchi, sense organ of third antennal segment of left side, X 840. 



151. Xenylla welchi, right hind foot, X 840. 



152. Xenylla welchi, left aspect of fm-cula, X 350. 



153. Xenylla welchi, left dens and mucro, X 840. 



154. Xenylla -welchi, left mucro, X 1230. 



155. Xenylla welchi, anal spines, X 350. 



156. Xenylla welchi, anal sjiine, X 840. 



157. Xenylla welchi, dorsal setae of first abdominal segment, X 350. 



Plate 19. 



Fig. 158. Xenylla gracilis, extremity of abdomen (from Guthrie). 



159. Xenylla gracilis, anal spines (from Guthrie). 



160. Xenylla gracilis, eyes of right side (from Guthrie). • 



161. Xenylla gracilis, furcula (from Guthrie). 



162. Xenylla nmritima, left mid foot, X 840. 



163. Xenylla maritima, left dens and mucro, X 840. 



164. Xenylla maritima, anal spines, X 840. 



165. Xenylla maritima, anal spine, X 1230. 



166. Xenylla maritima, dorsal setae of first abdominal segment, X 260. 



167. Fricsea caldaria, anal spines (from Guthrie). 



168. Friesea caldaria, anal spine (from Guthrie). 



169. Pseudachorutes aureofasciatus, eyes and postantennal organ of left side, X 450, 



170. Pseudachorutes aureofasciatus, dorsal aspect of head, X 86. 



171. Pseudachorutes aureofasciatus, left fore foot, X 480. 



172. PscudacJiorutes aureofasciatus, mucro, X 450. 



173. Pseudachorutes auieofascialus, modified hair, X 280. 



