14 Miss Anna J. Reilly on 



1904. — Silvestri, F. " Nuovi Geueri e Specie di Machilictee." Redia, 



vol. ii. 

 1910. — Verhoeff, K. W. " Ueber Felsenspringer, Machiloidea, 4 Auf- 



satz : Systematik und Orthomorphose." Zool. Anzeiger, xxxvi. 



EXPLANATION OF THE PLATES. 

 Plate I. 



Structural details of Fetrobius vectensis. 



Fig. 1. Lateral (right) view of insect, $. x 12. 



Fig. 2. Diagram showing shapes and positions of compound eyes (e), 



lateral ocelli (<>), and median ocellus (mo). X 30. 

 Fig. 3. Right inaudible of female, hinder aspect, c, condyle ; a, apex ; 



m, molar area. X 02. 

 Fiq. 4. Terminal region of same mandible, a, apex ; m, molar area. 



X 124. 

 Fig. 5. Left maxillula, hinder aspect. I, lacinia ; g, galea ; p, palp. 



X 124. 

 Fig. 6. Right maxilla of female, hinder aspect, c, cardo ; st, stipes ; 



/, lacinia; g, galea: p, palp. X 62. 

 Fig. 6 A. Head of lacinia of same maxilla, showing apex (a), "brush" (u), 



and acute processes (c and d). X 280. 

 Fig. 7. Labium of female. m, subinentum ; I, mentum ; p, palp. 



X 62. 

 Fig. 7 a. Sensory spines from apex of labium, x 280. 



Plate II. 



Structural details of Fetrobius vectensis (continued). 



Fig. 1. Eighth abdominal segment, cf, ventral aspect, sc, subcoxa ; 



st, stylet ; s, sternum. X 40. 

 Fig. 2. Ninth abdominal segment, S , ventral aspect, sc, subcoxa ; 



g, gonapophysis ; p, penis ; st, stylet. X 40. 

 Fig. 3. Fifth abdominal segment, <$ , ventral aspect. s, sternum; 



sc, subcoxa ; ve, exsertile vesicles ; st, stylet ; m, muscles. 



X 40. 

 Fig. 4. Eighth abdominal segment, § , ventral aspect, sc, subcoxa ; 



st, stylet; o, process of ovipositor. X 40. 

 Fig. 5. Ninth abdominal segment, $, ventral aspect, sc, subcoxa; 



st, stylet ; o, process of ovipositor. X 40. 



Plate III. 



Structural details of Petromackilis longicornis. 



Fig. 1. Lateral view of insect, $ (body-length 10 mm.). X 6. 



Fig. 1 a. Two basal segments of antenna. X 62. 



Fig. 1 b. Segments from about middle of antenna, showing grouping. 



X 62. 

 Fig. 2. Diagram showing shape and positions of compound eyes (e), 

 lateral ocelli (o), and median ocellus (mo). X 62. 



