66 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39, 



IV. CHALCIDOIDEA— Continued. 

 eulophid^. 



Aphelinin^. 



Coccopliagus lecanii (Fitch). — fig. 45. 

 Prospaltella herlesii (Howard). — fig. 47. 



EULOPHIN^. 



DimmocJcia incongruvs (Ashmead). — fig. 48. 

 V. CYNIPOIDEA. 



FlGITID^. 



FlGITIN^. 



Figites fioridanus Ashmead. — fig. 50. 

 Encoilin^. 



Hexaplasta, species. — fig. 49. 

 Cynipid^. 



Cynipin^. 



Rhodites mayri Schlechtendal. — fig. 51. 

 VI. PROCTOTRYPOIDEA. (The following four families are se- 

 lected as representative of the seven families 

 comprising this group.) 

 Helorid^. 



Helorin^. 



Helorus paradoxus (Provancher). — fig. 58. 

 Proctotrypid^. 



Proctotrypes caudatus Say. — figs. 53, 57. 



DlAPRIID^. 



DlAPRIIN^. 



Tropidopria conica (Fabricius). — fig. 59. 

 scelionid^. 



Telenomin^. 



Telenomus ashmeadi Morrill. — fig. 60. 

 VII. ACULEATA. (The following three aculeate families have been 



selected as representative of the superfamilies 

 included under this head.) 

 Ceropalid^ (formerly Pompilid^). 



Pepsis formosa Say. — fig. 61. 

 Myrmecid^e. 



Pogonomyrmex transversus (Smith). — fig. 62. 

 Apid^. 



Apis mellifera Linnaeus. — fig. 63. 



1. THE THORAX OP TBEMEX COLUMBA AND THE TENTHREDINOIDEA. 



Before undertaking a comparative study of the Hymenopteran 

 thorax it is most important to become thoroughly acquainted with 

 the thoracic structure in one of the more generalized members of the 

 order. In most of the higher families the original structure is so 

 obliterated, while secondary characters are so prominent, that the 



