6O2 THE STUDY OF INSECTS. 



The Thread-waisted Wasps, Family SPHECID/E. p. 650. 



The Ampulicids, Family AMPULICID.E. p. 647. 



The Larrids, Family LARRID^:. p. 652. 



The Bembecids, Family BEMBECID.'E. p. 652. 



The Nyssonids, Family NYSSONID.-E. p. 654. 



The Philanthids, Family PHILANTHID^E. p. 654. 



The Mimesids, Family MIMESID^E. p. 655. 



The Mellinids, Family MELLINID^. p. 647. 



The Pemphredonids, Family PEMPHREDONID^:. p. 655. 



The Crabronids, Family CRABRONID^E. p. 656. 

 The True Wasps, Superfamily VESPINA. p. 657. 



The Guest Wasps, Family MASARID.E. p. 657. 



The Solitary Wasps, Family EUMEXID/E. p. 658. 



The Social Wasps, Family VESPID.E. p. 660. 

 The Bees, Superfamily A PIN A. p. 664. 



The Short-tongued Bees, Family ANDRENID,^. p. 665. 



The Long-tongued Bees, Family APiD.t. p. 666. 



Classification of the Hymenoptera. 



(For Advanced Students.) 



Nearly all of the technical terms used in the descriptions of 

 Hymenoptera in this work have been defined already. For a general 

 account of the external parts of these insects see pp. 56-66 ; for a 

 more detailed description of the external anatomy of an insect, see 

 the discussion of the external anatomy of beetles, pp. 499. 



After a student has learned to recognize the sclerites in the body 

 wall of a beetle, he will have but little trouble in determining the 

 parts of a hymenopterous insect. The following points, however, 

 should be carefully noted : - 



The Propodeuin.k remarkable peculiarity of Hymenoptera is 

 that the first abdominal segment is united with the thorax in such a 

 way as to appear to be a part of it ; and what appears to be the first 

 abdominal segment, and is always called so, is really the sec- 

 ond. The true first abdominal segment is called the propodeum 

 (pro-po'-de-urn). 



The Tegithc. There is on each side of the second thoracic seg- 

 ment a cup-like scale over the base of the fore-wing (Fig. 732, 5); 

 this is the parapteron (see p. 502). The paraptera of the meso- 

 thorax of Hymenoptera are termed the tegulce (teg'u-lse) ; they cor- 

 respond to the patagia of Lepidoptera and to the elytra of 

 Coleoptera. 



