SCHISTOCERCA AMERICANA DRURY 155 



receptacle with a long duct has a separate opening dorsal to the 

 former. The male has two testes with two vasa defer entia uniting 

 in an ejaculatory duct which opens on the dorsal surface of the 

 subgential plate. A number of very fine tubes open into the 

 vasa deferentia near their junction and serve as seminal vesicles. 

 Development is combined with an incomplete metamorphosis. 

 The immature stage is sometimes called nymph and is in many 

 respects like the adult, but lacks the wings. 



Instructions 



1. Place a specimen in a white dish with water on its right 

 side and make a drawing twice natural size showing the left 

 side. In this position the parts enumerated below will be visible 

 and should be labeled. Head: frons, clypeus, labrum, vertex, 

 left gena, below it and limited in front by the clypeus and labrum, 

 the left mandible; behind the mandible the left maxillary palpus; 

 above the gena the left compound eye, in front of the eye the 

 left antenna and above the latter and close to the compound 

 eye left the ocellus or single eye. Thorax: prothorax including 

 pronotum, prosternum, prosternal spine and left prothoracic 

 leg; 1 mesothorax including mesothoracic wing, left pleuron, left 

 mesothoracic leg and mesosternum (mesonotum and mesotho- 

 racic spiracle are not visible); metathorax including pleuron, 

 metasternum, left metathoracic leg, and metathoracic spiracle 

 (meta thoracic wing and metanotum not visible). Abdomen: 

 as many segments as are not concealed by the wings, showing 

 tergite, sternite and spiracle of every segment. 



2. Place the specimen on its back in a dissecting tray, spread 

 the wings at right angles to the body and pin them down. 

 Make a drawing showing the ventral aspect of the animal. Label 

 antennas, frons, eyes, clypeus, labrum, mandibles, maxillary 

 palpi, labium, labial palpi, prosternum with spine, prosternal 



1 On the prothoracic leg label coxa, trochanter, femur, tibia and tarsus 

 with claws and pulvillus. 



