I05 • 



in front of these, and possibly the extreme 

 anterior portion of the abdomen will appear trans- 

 parent (air containing oesophageal diverticulum). 

 (Fig. 29.) 



To Dissect Out the Mid-Gut (Stomach) 



1. Pull off, with forceps, the legs and wings 

 (and remove most of the scales by a few strokes of 

 a small camel hair brush). 



2. Place a drop of salt solution on a slide, 

 and place the slide on a light background. 



Turn the mosquito upon its back and with a 

 needle, held in the left hand, transfix the thorax. 



Carry the mosquito transfixed on the needle 

 to the slide, and lower the tip of the abdomen 

 into the drop of salt solution. 



Keeping the transfixing needle in position, 

 make v/ith the other needle a nick upon either 

 side between the sixth and seventh abdominal 

 segments, which point corresponds to the division 

 between the mid and hind-guts. After thus 

 loosening the last few segments, place the point 

 of the needle upon them, slowly dragging them 

 away from the rest of the abdomen. 



