Forest entomology . m. 13. Basal fold of elytra. 14. Scutellary stria. 15. Suture of elytra. 16. Sutural angle. 17. Tibia. 19. Spurs of tibia. 20. Tarsus. 21. Onychimn and claws. 22. Stigma. 23. Pygidium. COLEOPTERA. 41 we have no fixed system of classification or method of arrangingbeetles. In catalogues they are generally grouped into familiesaccording to the number of joints of the tarsi: thus those possessingfive joints to all the tarsi have been termed Pentamera ; those withfive joints to the front and middle legs, and only four to the hinder,Heteromera ; those with apparently o
Forest entomology . m. 13. Basal fold of elytra. 14. Scutellary stria. 15. Suture of elytra. 16. Sutural angle. 17. Tibia. 19. Spurs of tibia. 20. Tarsus. 21. Onychimn and claws. 22. Stigma. 23. Pygidium. COLEOPTERA. 41 we have no fixed system of classification or method of arrangingbeetles. In catalogues they are generally grouped into familiesaccording to the number of joints of the tarsi: thus those possessingfive joints to all the tarsi have been termed Pentamera ; those withfive joints to the front and middle legs, and only four to the hinder,Heteromera ; those with apparently only four to all the tarsi, Tetramera;and those with apparently only three to all the tarsi, In looking over a list of Coleoptera, the systematic student willobviously note that he enters the domain of beetles associated withforest trees deep down in his list. It is also, however, somewhat Fig. 42— Typical beetle: Dytiscus marginalis,/.. (male), under side (water-beetle). (FromFowlers British Coleoptera.). 1st ventral segment of abdomen. 2nd „ „ 3rd „ ,, 4th ., >, .i 5th „ 6th „ „ ,, Prosternum, terminating in prosternalprocess. Episternum of prosternum. Episternum of mesostermini. Epimeron of mesosternum. Metasternum. Wing of metasternum. Episternum of metasternum. Coxal cavities. Coxse (posterior pair very largely devel-oped for the support of the swimminglegs). Trochanter. Femur. Tibia. Dilated tarsus or palette, and cupulesof male. Oar-shaped tarsus. Coxal process. Epipleura of elytra. Genital armature. remarkable, so far as hunting-ground is concerned, that where thestudent in forest insects begins, the systematic man and the studentof many forest insects might claim mutual association all along aconsiderable portion of the list. It is, however, only essential toselect the more salient species, and in doing so many arboreal specieswill have to be omitted. On the other hand, so as to present any-thing like completeness, many species would have to b
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