206 Prof. J. C. Schiodte on the Classification 



ated in the abdominal cavity, and can be pushed out behind 

 the dorsal shield of the penultimate segment. When they are 

 retracted in their natural position, numerous ducts, proceeding 

 from the glandular cells (which are accumulated so as to form , 

 acini), are seen to open at their bottom. They are furnished 

 with striped muscular fibres, fixed to the bottom and on one 

 side, and when they are protruded, the greater part of the cel- 

 lular tissue and muscular fibres follow the walls of the bags, 

 and are consequently then situated inside the bags, which are 

 turned outside in. 



With regard to the nervous system, I have to observe that 

 the ventral chords are not separated beyond the ganglion meta- 

 thoracicum; but for the rest they are closely united, sometimes 

 enclosed in one and the same neurilemma. There are eight 

 abdominal ganglia, of which the first two are situated in the 

 metathorax, the foremost of them close to the metathoracical 

 ganglion ; the seventh and eighth ganglia (the sexual ganglia) 

 are as usual closely united. The nervous stems for the organs 

 of respiration proceed as usual from particular small ganglia in 

 front of the abdominal ganglia connected with the ventral cords. 



If, now, we institute a comparison between the inner structure 

 of Buprestidse and that of Elateridse, the essential results will 

 be the following : — 



BUPRESTID^. ELATERID^. 



The trachecB furnished with The trachece without vesicles, 

 numerous vesicles. 



Salivary glands very much ra- No salivary glands. 

 mified. 



The digestive tube long, two The digestive tube short, very 



or three times the length of the little longer than the animal, 

 animal. 



(Esophagus long, the craw (Esophagus very short, the 



large, situated in the hind part craw small, situated in the fore 



of the prothorax, in the nieso- part of the {)rothorax. 

 thorax, or even in the metathorax; 



Esophagus with large lateral (Esophagus simple, even in 



dilatations in those species which species feeding on flowers, 

 feed on flowers. 



The stomach long, with two The stomach short, almost 



horns on its anterior extremity, straight, without horns, very few 



spirally wound behind, very glan- glands, 

 dulous. 



The intestine bent at an angle, The intestine straight ; the 



with strongly developed glandu- colon not at all distinct, or, rather, 



lous colon, indistinctly marked ; few glands. 



