94 



BULLETIN OF THE BROOKLYN KNT. SoC. 



This method has two great faults; first, that only one hand can 

 be employed to give the larva the required shape, as the other is 

 occupied in holding the straw while blowing in the air: second, 

 that the last ventral segment, so characteristic in many larva' is 

 spoiled by the insertion of the straw. 



Recently Mr. Fritz A. Wachtel has constructed an apparatus, 

 which we think will work excellently. It consists of bottle K tight- 

 ly closed by a cork or rubber. Two regtangulai-ly bent glass Tubes 

 pass through this cork, the one A having a larger diameter, is 

 connected by the rubber tube S, with the rubber bellows B, the 

 smaller one C connects by the rubber tube D with a. tine pointed 

 glass tube E, on which the larva-skin F is secured. The glass 

 tube is held by the stand O, which allows vertical and horizontal 

 movements thereby facilitating the approach of the larva to the 

 heated metal plate that rest upon the tripod N, under which is 

 placed the gas or alcohol lamp Lr. 



The bellows are worked by the foot and the air passing through 

 the rubber tube S and the glass pipe A is compressed in the 

 bottle by reason of the smaller diameter of the exit pipe C, cans- 



