Beginners' zoology . When they are broughttogether again, what must be theeffect ? In pumping the air, the abdomen may be said towork like a bellows. Bellows usually have folds to allowmotion. Is the comparison correct .> How many times in a minute does the grasshopper takein If it is made to hop vigorously around the roomand the breathing is again timed, is there any change ? Find the ears on the front wall of the first abdominalring- (Fig. 107). They may be seen by slightly pressingthe abdomen so as to widen the chink between it andthe The ears are merely glistening, transp
Beginners' zoology . When they are broughttogether again, what must be theeffect ? In pumping the air, the abdomen may be said towork like a bellows. Bellows usually have folds to allowmotion. Is the comparison correct .> How many times in a minute does the grasshopper takein If it is made to hop vigorously around the roomand the breathing is again timed, is there any change ? Find the ears on the front wall of the first abdominalring- (Fig. 107). They may be seen by slightly pressingthe abdomen so as to widen the chink between it andthe The ears are merely glistening, transparentmembranes, oval in form. A nerve leads from the inner. Fig. 107. — A Grass-hopper Dissected. INSECTS 65 surface of each membrane. State any advantage or dis-advantage in having the ears located where they are. Ovipositor. — If the specimen is a female, it has an egg-placer or ovipositor, consisting of four blunt projectiofis atthe end of the abdomen (Fig. 107). If it is a male,there are two appendages above the end of the abdomen,and smaller than the parts of the ovipositor. Femalesare larger and more abundant than males. In layingthe eggs, the four blunt points are brought tightly to-gether and then forced into theground and opened (Fig. 108). By repeating this, the grasshoppermakes a pit almost as deep as theabdomen is long. The eggs arelaid in the bottom of the pit. Draw a side view of the grass-hopper. Thorax. — This, the middle por-tion of the body, consists of threesegments or rings (Fig. 107). Is the division between therings most apparent above or below .<* Which two of thethree rings are more closely united} The front ri
Size: 1351px × 1849px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
