The Coleoptera of the British islandsA descriptive account of the families, genera, and species indigenous to Great Britain and Ireland, with notes as to localities, habitats, etc . student is able to dissect he will not be able inmany instances to rightly determine the genera, much less the species :a little practice is all that is required : as a rule, when the mental suture issevered,the mentum,labiumand maxillcemayat once be removed in one piece; the man-dibles may be examined without removal:if, therefore, the mouth parts are carefuUjdissected and the insect again remounted,it will to all
The Coleoptera of the British islandsA descriptive account of the families, genera, and species indigenous to Great Britain and Ireland, with notes as to localities, habitats, etc . student is able to dissect he will not be able inmany instances to rightly determine the genera, much less the species :a little practice is all that is required : as a rule, when the mental suture issevered,the mentum,labiumand maxillcemayat once be removed in one piece; the man-dibles may be examined without removal:if, therefore, the mouth parts are carefuUjdissected and the insect again remounted,it will to all intents and purposes be stillperfect. Above the mouth there is usually visible asmall piece which is called the lahmm or up-per lip ; it is usually, but not always, more orless membranous ; it either projects whollyor partially beyond the clypeus, or it may becompletely hidden behind the clypeus andbe connate with it; useful characters aresometimes foimd in its shape, whether emar-ginate, truncatci projecting, &c. Below thelalirum come the large jaws or mandibles,which are the most powerful of the mouthorgans; they vary much in shape according to the food of the insect:. Head of D. marginalis, upper Labrum. &. Clypeus. c,d. Man-dibles, e. Eyes. y. Baseof anten-ua3. g. Vertex, h. Occiput. XXVI INTRODUCTION. in the Carnivorous beetles they are usuallj sharply pointed ami furnishedwith a cutting edge in order to enable them to seize and hold fast and cutu]) tlieir stniggling prey ; in the plant-feeding beetles they are broad amiblunt, and more adapted for trituration than cutting ; the cavities at thesides of the mandibles (in the Carabida?, &c.) have been before referredto as termed the mandihular scrobes: these scrobes are often furnishedwith single long setie, which seem to have much the same office toperform as the supra-orbital sotjB above referred to, and probably boarsome analogy to the whiskers of the feline tribe. Below the mandibles there is a second pair of hor
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Keywords: ., bookcentury1800, bookdecade1, booksubjectentomology, bookyear1887
