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BROOKLYN, MARCH. 1879. No. 11. 



ON COLEOPTEROUS LARVM 



OF THE 



FAMILY OF TENEBRIONID^. 



BY C. F. GISSLER. 



On page 18 of the Bulletin 1 have endeavoured to describe the 

 larva> of Eleodes gigantea, and dentipes. Since that time new 

 material has been received and the occasion is now made use of to 

 present additions to those observations as well as remarks on 

 other larva;. 



I had occasion to study the larva? of Blaps, Tenebrio. Boleto- 

 therus, Eleodes, Guathocerus, Platydema, Tenebrionellus and Xy- 

 lopinus, and found, as already hinted to in No. 2 of Bulletin, that 

 they are fair examples of the law of ontogenetical continuity 

 of closely related animal forms, whose embryonic stages are near- 

 ly identical and scarcely if at all, differentiated. In both genera 

 Tenebrionellus as well as Eleodes (fig. 15) the 1st post-embryonic 

 stages are alike in the form of the pygidium. 



To the latter I have paid more attention though it is liable to 

 slight variations in larger individuals of Blaps and Eleodes. — 



The larva? of Tenebrionidae in general closely resemble those 

 of Elateridffi, the former differ in having the cardo of maxilla 

 connate and a transverse impression immediately behind the ely- 

 peus, thus apparently separating the same from the front, and 

 also by the better developed labrum. 



Very young larva? have their antennal joints more globular 

 than older ones. In full grown larvae of Tenebrionida 1 the 1st 

 joint of antenna is much shorter than the 2nd, its substance soft. 



