HOW TO KNOW THE IMMATURE INSECTS 



Fig. 51. a, Adelphocoris ra- 

 pidus (Say); b, Melanoplus 

 dif f erentiolis ( Thomas ) . 



a 



Fig. 52. a. Pupa: Vespa macu- 

 tota Kirby; b, Larva: Pteronidea 

 ribesii (Scopoli). 



4a. Tarsi usually consisting of 2, 3, or 4 

 segments, rarely of 5, and very rarely 

 of a single segment. Legs very rarely 

 wanting. Thorax with all 3 segments 

 exposed and generally different in 

 form; pleural and sternal sclerites us- 

 ually distinct and never concealed; 

 wing pads usually present; epicranial 

 suture does not extend to the clypeus; 

 external genitalia may be evident in 

 later instars. 



Fig. 51 NYMPHS 5 



4b. Tarsi usually consisting of a single 

 segment, or legs wanting, or seg- 

 mentation of tarsi difficult to deter- 

 mine; more rarely tarsi of 2. 3, or 4 

 segments; thorax with all three seg- 

 ments similar in form and wing 

 pads wanting; or, wing pads pre- 

 sent, laterally and ventrally, the 

 thoracic segments not exposed; the 

 pleural and sternal sclerites never 

 distinct^ either not differentiated 

 from notum or concealed by legs 

 and wing pads; epicranial suture 

 usually extends to clypeus; extern- 

 al genitalia not evident.. 



Fig. 52. . .LARVAE and PUPAE. . 17 



NYMPHS 



5a. Mouth parts adapted 

 for piercing and suck- 

 ing, or for piercing c^rpfos 

 and rasping. 



Fig. 53. 



.14 





Fig. 53. Mouth parts: a, piercing and rasping; b, 

 piercing and sucking. 



31 



