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APPENDAGES OP THE THORAX. 



There are three pairs of legs and two pairs of wings in 

 Anosia. Note the small size of the first pair of legs. Make 

 out coxa, trochanter, femur, tibia, and tarsi in the legs. 

 Note the great development of themeso- andmetacoxae, and 

 note they are each divided longitudinally by a distinct suture. 

 They form a considerable part of the lateral aspect of the 

 meso- and metathoracic segments. 



The forewings are larger and of more use in flight than 

 the hindwings, which is in contrast to the case with the 

 locust. The wings, like those of the locust, are membraneous 

 plates supported by a framework of strong, hollow veins 

 with strongly chitinized walls. The venation of the wings 

 affords important characters for classification, but we cannot 

 consider the subject here. Note that the upper and lower 

 surfaces of both fore and hindwings are covered with fine 

 scales. Rub off some of these scales upon a glass slide, and 

 examine with a high power. Note that each scale consists 

 of a little stem and a broad flat blade. This blade is longi- 

 tudinally striated. The scale is simply a flattened mem- 

 braneous sac, and the striae are fine ridges running along the 

 upper membrane. Examine a small bit of the wing from 

 which some of the scales have been rubbed off, note the 

 little pits or sockets in which the pedicel of the scales fits, 

 and note the regular arrangement of the scales into rows, 

 each row consisting of two tiers. 



Make a drawing showing a part of the wing partly covered 

 by scales and partly denuded. 



PARTS OF THE ABDOMEN. 



The abdomen is composed of nine segments ; the first or 

 basal one is depressed, while the others are more or less 

 compressed. The second and third are the largest two seg- 



