EXPLANATION OF SYMBOLS AND LETTERS. 



143 



first to fourth branches of 



L, leg. 



Lb, labium. 



Lhl, labellum. 



LbNv, labial nerve. 



LbPlp, labial palpus. 



Lc, lacinia. 



Let, lancet of sting, equivalent to first gonapophysis (IG). 



Lg, ligula. 



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



Lin, median lobe of lingua or hypopharynx. 



Lm, labrum. 



LMcl, longitudinal muscles. 



Imcl, ventral longitudinal muscles of thorax. 



LmNv, labral nerve. 



Lr, lorum. 



LTra, trachea of leg. 



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



alimentary canal, or gland. 



M, media, fourth vein of wing. M^-M^ 



media. 



rn, median plate or plates of wing base. 



Mai, Malpighian tubules. 



Mb, intersegmental membrane. 



mb, membrane. 



ni-cu, medio-cubital cross-vein. 



MD, disclike muscle apodeme. 



Md, mandible. 



IMdGl, outer saclilve mandibular gland. 



2MdGJ, inner racemose mandibular gland. 



EldNv, mandibular nerve. 



Mes, metathorax. designated by figure 



thoracic symbol. 



Met, metathorax. designated by figure 



thoracic symbol. 



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



individually designated mi. 



mi, cervical (microthoracic) sclerites. 



m-m, median cross-vein. 



Mps, mouth parts or trophi. 



Mt, mentum. 



Mth, mouth. 



Mx, maxilla. 



MxPlp, maxillary palpus. 



MxNv, maxillary nerve. 



N, notum. 



tin, nucleus. 



JVv, nerve. 



O, ocellus. 



06, oblong plate. 



Oc, occiput. 



(E, oesophagus. 



CEConi, circuuKesophagcal commissures. 



Om, ommatidium. 



OpL, optic lobe. 



placed after and below any 

 placed after and below any 



