USED IN ENTOMOLOGY. 85 



MM.: ^Millimeter: .001 meter ^ .039 of an inch: roughly 25 mm. are 

 counted to an inch in measuring insects. 



Mimetic: when a species mimics or resembles another or some other object 

 in appearance : but not in structure and other characters. 



Mimicry: strictly, the resemblance of one animal to another not closely related 

 animal, living in the same locality ; often loosely used to denote also 

 resemblance to plants and inanimate objects: Batesian mimicry is where one 

 of two similar species is distasteful (so-called model), the other not dis- 

 tasteful (so-called mimic) ; Mitllcrian mimicry is where both species are dis- 

 tasteful. 



Mines: applied to galleries or burrows between upper and under surface of 

 leaf tissue, when made by larvae : they are linear, when they are narrow and 

 only a little winding ; serpentine, when they are curved or coiled, becoming 

 gradually larger to a head-like end : trumpet-mines, when they start small 

 and enlarge rapidly at tip; blotch mines, when they are irregular blotches; 

 tentiform, when the blotch mines throw the leaf into a fold on one side. 



Miniate -us: of the color of red lead [vermilion with a slight admixture of 

 dragon's blood]. 



Mirror: in Cicada; see specular membrane. 



Mitosoma: the middle piece of a developing spermatozoon. 



Mobile: movable: having the power of motion. 



Model: see mimicry. 



Modioliform: globular, truncated at both ends; like the hub of a wheel. 



Mola or Molar: the ridged or roughened grinding surface of the mandible: 

 when the mandible is compound, the molar corresponds to the subgalea of 

 maxilla. 



Monarsenous: that kind of union where one male suffices for many females. 



Moniliform: beaded like a necklace. 



Monochromatic: of one color throughout. 



Monodactyle: with a single movable claw which closes on the tip of the 

 other leg structures as in some parasitica. 



Monodomous: ants in which each colony has one nest only. 



Monoecious: when both sexual elements or glands exist in one individual. 



Monogamous: a union where a female is fertilized by one male only. 



Monomeri: insects with one-jointed tarsi. 



Monomorphic: species of which only one sex (female) is known to exist. 



Monophagous: insects feeding upon only one species or genus of plants. 



Monothelious: a union where one female is fecundated by many males. 



Monotrocha -ous: Hymenoptera in which the trochanters are single: having 

 legs in which the trochanter is one-jointed. 



Monotypical: a genus described from a single species, no other being known; 

 or described from a single specified species with which are associated others 

 believed to be identical in structure : see isotypical and heterotypical. 



Moult: a period in the transformation when the larva changes from one 

 instar to another: the cast skin of a larva that has moulted. 



Mouth: the anterior opening into the alimentary canal, where the feeding 

 structures are situated and in which the food is prepared for ingestion. 



