EXPLANATION OF SYMBOLS AND LETTEKS. 



143 



L, 



Lb, 



Lbl, 



LWv, 



LbPlp, 



Lc, 



Let, 



Lg, 



LGI, 



Lin, 



Lrn, 



LUol, 



Imcl, 



LmJfv, 



Lr, 



LTra, 



Lum, 



M, 



m, 



Mai, 



Mb, 



mb. 



m-cu, 



MD, 



Md, 



IMdGl, 



2MdGl, 



MdNv, 



Mes, 



Met, 



Mi, 



mi, 



m-m, 



Mps, 



Mt. 



Mth, 



Mod, 



MxPlp, 



MxNv, 



N, 



Nu, 



Nv, 



0, 



Ob, 



Oe, 



(E, 



(EGom, 



Om, 



OpL, 



leg. 



labium. 



labellum. 



labial nerve. 



labial palpus. 



lacinia. 



lancet of sting, equivalent to first gonapophysis UG). 



ligula. • 



"lubricating" gland of sting (not shown in figures). 



median lobe of lingua or hypopharyux. 



labrum. 



longitudinal muscles. 



ventral longitudinal muscles of thorax. 



labral nerve. 



lorum. 



trachea of leg. 



lumen, the cavity of any hollow organ, whether the glossa, sting, 



alimentary canal, or gland, 

 media, fourth vein of wing. M^-M^, first to fourth branches of 



media, 

 median plate or plates of wing base. 

 Malplghian tubules, 

 intersegmental membrane, 

 membrane. 



medio-cubital cross-vein, 

 disclike muscle apodeme. 

 mandible. 



outer saclike mandibular gland, 

 inner racemose mandibular gland, 

 mandibular nerve, 

 mesothorax, designated by figure 2 placed after and below any 



thoracic symbol, 

 metathorax, designated by figure 3 placed after and below any 



thoracic symbol, 

 the chitinous plates of the neck collectively, the " microthorax," 



Individually designated mi. 

 cervical (microthoracic) sclerites. 

 median cross-vein, 

 mouth parts or trophi. 

 mentum. 

 moutli. 

 maxilla. 



maxillary palpus, 

 maxillary nerve, 

 notum. 

 nucleus, 

 nerve, 

 ocellus, 

 oblong plate. 

 occiput, 

 oesophagus. 



circumoesophageal commissures, 

 ommatidlum. 

 optic lobe. 



