HYMENOPTERA 6oi 



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/e. p. 611. 

 The Horn-tails, Family Siricid^e. p. 614. 

 The Gall-inhabiting Hymenoptera. 



The Gall-flies, Family Cynipid^e. p 615. 

 The Parasitic Hymenoptera. 

 The Trigonalids, Family Trigonalids. 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 Evaniids. p. 626. 

 The Chalcis-flies, Family CHALCIDID/E. p. 628. 

 The Proctotrupids, Family Proctotrupid^e. p. 630. 

 The Stinging Hymenoptera, Suborder Aculeata. p. 63:. 

 The Pelecinus, Family Pelecinid^e. p. 631. 

 The Cuckoo-flies, Family Chrysidid.^ p. 632. 

 The Ants, Superfamily Formicina. p. 633. 



Family Formicids. p. 640. 



Family Ponerid^e. p. 642. 



Family Myrmicids. p. 642. 

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



The Velvet-ants, Family MUTILLlDiE. p. 648. 



The Scoliids, Family Scoliidje. p. 649. 



The Sapygids, Family Sapygid^e. p. 649. 



The Spider-wasps, Family Pompilids. p. 650. 



