132 



ENTOMOLOGY 



At the anterior end of the germ band is a pair of large procephalic 

 lobes (Figs. 195, 197), which eventually bear the lateral eyes, and im- 

 mediately behind these are the 

 p fundaments of the antennae. The 

 fundaments of the primary paired 

 appendages are out-pocke tings of the 

 ectodermal germ band, and at first 

 antennae, mouth parts and legs are 

 5 FIG. 196. Diagrammatic sagittal sec- all alike, except in their relative 



tion of hymenopterous egg to show nn ~j t irm<; TJpViinrl thp sntpnn^ fin 

 stomodseal (s) and proctodaeal (p) in- tlS * 



vaginations of the germ band (g). Thysanura and Collembola at least) 



After GRABER. 



appears a pair of rudimentary 



appendages (Fig. 197, i) which are thought to represent the second 

 antennae of Crustacea; instead of developing, they disappear in the 

 embryo or else persist in the adult as mere rudiments. In front of these 



a,; 



PIG. 197. Ventral aspect of germ 

 band of a collembolan, Anurida marit- 

 ima. a, antenna; a l -a 6 , abdominal 

 appendages; i, intercalary append- 

 age; I, labrum; li, left labial append- 

 age; m, mandible; mx, maxilla; p, 

 procephalic lobe; pr, proctodaeum; 

 L -/ 3 , thoracic legs. 



--mx 



FIG. 198. Anterior aspect of embryonal mouth 

 parts of a collembolan, Anurida maritima. a, 

 antenna; /, labrum ; Ig, prothoracic leg; li, left funda- 

 ment of labium; In, lingua; m, mandible; mx, max- 

 illa; p, maxillary palpus; si, superlingua. After 

 FOLSOM. 



transitory intercalary appendages is the mouth-opening, above which 

 the labrum and clypeus are already indicated by a single, median 

 evagination. Behind the mouth the mandibles, maxillae and labium are 



