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 re- 

 lated 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 

 distasteful (so-called mimic) ; Miillerian mimicry is where both species 

 are distasteful. 



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

 leaf tissue, when made by larvse : they are linear, when they are narrow 

 and only a little winding; serpentine, when they are curved or coiled, be- 

 coming gradually larger to, a head-like end ; trumpet-mines, when they start 

 small and enlarge rapidly at tip ; blotcli mines, when they are irregular 

 blotches ; tcntiform, 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: Hymcnoptera 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 asso- 

 ciated others believed to be identical in structure : see isotypical and hetero- 

 typical. 



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. 



