HYMENOPTERA 6oi 



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have all of the limbs of the adult insect inclosed in sheaths, 

 and folded upon the breast. With many species the larva, 

 before changing to a pupa, spins a cocoon about its body. 

 With some this cocoon is composed of comparatively loose 

 silk, and resembles somewhat the cocoon of a moth. In 

 others the cocoon is of a dense parchment-like texture, and 

 in still others it resembles a very delicate foil. 



Although there are very many species of Hymenoptera, 

 the number of families is not large. The following synopsis 

 will aid the student in fixing in his mind the relationships 

 of the different families: 



SYNOPSIS OF THE HYMENOPTERA. 



THE BORING HYMENOPTERA, Suborder TEREBRANTIA. p. 610. 

 The Plant-eating Hymenoptera. 

 The Saw-flies, Family TENTHREDINID^:. p. 611. 

 The Horn-tails, Family SlRlClD^E. p. 614. 

 The Gall-inhabiting Hymenoptera. 



The Gall-flies, Family CYNIPID^. p 615. 

 The Parasitic Hymenoptera. 



The Trigonalids, Family TRIGONALID^E. p. 621. 

 The Ichneumon-flies, Family ICHNEUMONID/E. p. 621. 

 The Stephanids, Family STEPHANID^E. p. 624. 

 The Braconids, Family BRACONID^E. p. 625. 

 The Ensign-flies, Family EVANIID^. p. 626. 

 The Clialcis-flies, Family CHALCIDID^:. p. 628. 

 The Proctotrupids, Family PROCTOTRUPID^E. p. 630. 

 THE STINGING HYMENOPTERA, Suborder ACULEATA. p. 63: 

 The Pelei i'ius, Family PELECINID^E. p. 631. 

 The Cuckoo-flies, Family CHRYSIDID.^E p. 632. 

 The Ants, Superfami'.y FORMICINA. p. 633. 



Family FoRMlClD^E. p. 640. 



Family PONERID^. p. 642. 



Family MYRMICID^E. p. 642. 

 The Digger-wasps, Superfamily SPHECINA. p. 644. 



The Velvet-ants, Family MUTILLID^. p. 648. 



The Scoliids, Family ScoLiiDyE. p. 649. 



The Sapygids, Family SAPYGID/E. p. 649. 



The Spider-wasps, Family POMPILID^E. p. 650. 



