USED IN ENTOMOLOGY. 81 



Medio-cubital cross-vein: between media 4 and cubitus 1, connecting the 

 two series (Comst.). 



Medio-ventral line: in caterpillars, extends along middle of under side. 



Medipectus: the under side of mesothorax : the mesosternum. 



Mediproboscis: the middle third of the flexed proboscis of muscid flies. 



Medi-thorax: = mesothorax ; q. v. 



Medius: middle. 



Mega- Megalo-: large. 



Melanic: with a blackish suffusion. 



Melanism: an abnormal or unusual darkening: a suffusion with blackish. 



Mellifera: honey-makers: applied to bees as a whole. 



Melliferous: honey-producing, or producers of honey. 



Mellisugous: honey-sucking: a feeder on honey. 



Member: any one of the external appendages. 



Membranaceous: thin, skin-like, semi-transparent, like parchment: of a thin, 

 pliable texture. 



Membrana retinens: the stretched part of the membrane around the rectum 

 of butterfly larvae, used in the change to the chrysalis. 



Membrane -ana: any thin, transparent, flexible body tissue: specifically the 

 wing tissue between the veins : in Hctcroptcra, the thin membranous tip of 

 the hemelytra. 



Membranous or eous: composed of membrane or skin-like tissue. 



Membranule: the small opaque expansion at base of wings in Odonata. 



Meniscoidal: with one side concave, the other convex, like a round segment 

 from a hollow sphere. 



Menognatha: insects in which both young and adults feed by mandibles; 

 e. g., the Orthoptera: see menorhyncha and metagnatha. 



Menorhyncha: forms in which both young and adult take food by suction; 

 e. g., Hemiptera: see menognatha and metagnatha. 



Mental suture: in Cole opt era, the line between mentum and gula. 



Mentigerous: bearing or having a mentum. 



Mentum: a labial sclerite bearing the movable parts; attached to and some- 

 times fused with the submentum; corresponds to the (united) stipes of 

 maxillae : in Colcoptcra, what is usually called mentum is really submen- 

 tum : in Diptcra, the term is applied to the posterior oral margin: in 

 Hymenoptera, is part of " tongue," the second joint bearing the labial 

 palpi, paraglossae and ligula. 



Merdivorous: feeding upon dung or excrement: see scatophagous. 



Meriaeum: the posterior inflected part of the metasternum in Coleoptcra. 

 Meroistic: ovaries that secrete yolk or vitellaginous cells as well as ova. 

 Mesad: extending or directed toward the median plane. 

 Mesal: pertaining to, situated on or iu the median plane of the body. 

 Mesenchym: that portion of the mesoderm that produces the connective 



tissues of the body. 



Mesenteron: the mid-gut, stomach or chylific ventricle: the middle portion 

 of the primitive intestinal canal, lined with entoderm. 



