Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 834
taor spiracles throughwhich the air enters thetracheal system, are ge-nerally visible on theexterior of the body of the insect (especially on the abdominal seg-ments) as a series of pores along each margin of the under surface. Inmost larvas, nearly every segment is provided with a pair : but inthe… … Tracheal system of Nepa (Water-scorpion):—a, head; b, iirst pair of legs ; c, first segmentof thorax; d, second pair of wings ; e, secondpair of legs ; /, ti-acheal trunk; #, one of thestigmata; h, air-sac. 743 INSECTS AND AEACHNIDA. in different insects; and even where the general j)lan is…
Microscopy · Biology
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