HYMENOPTERA 



155 



separates them from all 

 saw-flies, and these do 

 not have the boring or- 

 gan. The larvae are white 

 and grub-like and bore 

 in the solid wood of 

 different trees, notably 

 hickory, locust and the 

 coffee bean. Not many 

 species occur and these 

 may easily be known 

 by the description here 

 given. 



Tenthredinoidea. The 

 Saw-flies have, at the 

 most, a very slight con- 

 striction between the 

 thorax and the abdomen. 

 They have also rather 

 flat backs and broad 

 hind wings. The fe- 

 males have a short saw- 

 like organ used to form 

 a cavity for the recep- 

 tion of the eggs which 

 are placed most within 

 leaves or in growing 

 stems. Saw-flies are 

 variable in size, ranging 

 from one-fourth inch 

 to over one inch in 

 length. The larvae of 

 saw-flies are caterpillar-like 



other Hymenoptera except the 



FIG. 114. Types of Hymenop'era. 

 Slightly reduced. 



1, Pelecinus polyturator (Pelecinidce) ; 2, 

 3, and 4, Saw-flics (Tenthredinidce); 5, Horn- 

 tail or Pigeon Tremex (SiricidcE) ; 6, 6, and 

 7, Gall-flies (Cynipidce) ; 8, Cuckoo-fly (Chrys- 

 ididce) ; 9, Gouty-gall on blackberry, formed 

 by gall-fly (7). 



or slug-like. The slug-like forms 



