156 INTERNAL ANATOMY OF INSECTS. 



pidoptera and the humble-bee there are four a ; in the 

 common louse there are Jive b ; in the rhinoceros-beetle 

 and the cockchafer, six c ; in the wasp, seven d ; eight in 

 the cockroach e ; twelve in the Car obi and the mealworm- 

 beetle f ; thirty in the large green grasshopper (Acrida 

 viridissima ) ; thirty-two in the cheese-maggot-fly h ; and 

 in the hive-bee more frhan a hundred andji/ty '. 



The number of eggs also contained in the ovaries 

 varies. In Echinomyia grossa there is only one egg in 

 each, and only two at once in the matrix k : in another 

 fly produced by the cheese-maggot there are four ! ; in 

 the louse there are Jive ; in the cockchafer six m ; in the 

 hive-bee sixteen or seventeen are visible at the same time n ; 

 and in the silkworm-moth sixty or seventy . Besides 

 the eggs, the tubes contain a pellucid mucus, and at 

 their upper extremity the eggs are lost in a granular 

 mucous mass, in which, however, they may still be dis- 

 covered with a microscope p. With regard to the ter-' 

 mination of the ovaries or egg-tubes internally, in those 

 that have agglomerated ones it is not to be traced, the 

 whole appearing like an oblong obtuse or acute body i : 

 but in the branching ones it is more easily traced ; at 

 first they converge in most cases to a point ; this is seen 

 to advantage in the caterpillar of some butterflies, when 

 near assuming the pupa, in which they are readily dis- 

 covered, and represent with great truth and elegance the 



Ibid. i. 203. b PLATE XXII. FIG. 2. 



Swamm. ubi supr. i. 151. Gaede Anat. der Ins. t. ii./. 3. 

 Swamm. i. 203. 



Gaecle Anat. der Ins. 20. t. If. 9. f Kid. 25, 28. t. ii./. 1 0. 



Ibid. 32. h Swamm. ii. 74. 5 Ibid. 203. /. xix./. 3. 



Reaum. iv. 391. ! Swamm. /. xliii./. 19. m Gaede 22. 

 Swamm. Bibl. Nal. i. 203. Ibid. p Rifferschw. II. 



Swamm. t. xlii./. 8. Gaede, /. i./, 3. cc. 



