568 



W. L. TOWER, 



Explanation of Plates. 



Plates 14 — 2 0. 



All figures were outlined by the aid of an Abbé camera and detail 

 was put in free hand. The figures are arranged on the plates with the 

 dorsal side uppermost ; the anterior end to the right ; and in the case 

 of sections the observer is in all cases looking at the posterior surface. 

 All figures are from material killed in corrosive sublimate acetic acid 

 mixtures. Exceptions to these general statements are noted in the ex- 

 planation of individual figures. 



Abbreviations used. 



a anterior 



al.a anterior wing or elytron 

 al.p posterior wing or elytron 

 can pore canal in the cuticula 

 cap. eta hair-like processes from the 



taenidia 

 cd heart 



cl.emb embryonic cells of Verson 

 cl. frm formative cells of the scales 

 cl.frm.rd formative cells of the 



chitinous columns 

 cor. ad fat body 

 cox coxa 

 eta cuticula 

 cta^ primary cuticula 

 cta^ secondary cuticula 

 cta*^ cuticula secreted by hypo- 



dermis of the wing fundament 

 d dorsal 



dc.mpg Malpighian tubule 

 dsc. V ventral disc 

 fbr fibre-like process of hyodermal 



cell 

 frm femur 

 fl.exu exuvial fluid 



for. al foramen to wing cavity 



for. sac foramen to wing sac 



gl.exu exuvial gland 



gl.Kdrm hypodermal gland (unicel- 

 lular) 



gl.Ji'drm hypodermal gland (com- 

 pound) 



gl. put glandular pit 



hœ'lp haemolymph 



Kdrm hypodermis 



h'drm^ hypodermis of dorsal side 

 of wing 



Kdrm^ hypodermis of ventral side 

 of wing 



hdrm. col hypodermal column 



lam lamella 



leu'cy leucocyte 



lum lumen 



mbr membrane 



mbr. m median membrane 



mbr.pr basement membrane 



ms'drm mesoderm tissue 



ms'drm. nuc nuclei of mesoderm 

 tissue 



mu muscle 



