LIBELLULA. 151 



Hal. Lake Michigan, Wisconsin. It migrates in immense flocks 

 (Dr. Hoy); Canada; Massachusetts (Scudder) ; Europe; Asia; 

 Siberia ; Kamtschatka. 



Common everywhere that it occurs. The male L. ternaria Say, 

 from Massachusetts, certainly belongs to this species. The female 

 of that species belongs to the following. 



2. L. semifasciata ! 



Libellula semifasciata Bnrm.l Handb. II, 862, 80. Lib. maculata Rainb.! 

 Neuropt. 55, 31. Libellula ternaria Say ( 9 ), Journ. Acad. Philad. 

 VIII, 21, 7. - 



Reddish-yellow, villose ; front lurid, above terminated with 

 black ; sides of the thorax obliquely twice marked with yellow ; feet 

 black, femora yellowish rufous ; apex of the abdomen attenuated, 

 the dorsura with apical, triangular, fuscous spots, and lateral 

 brighter yellow ones ; superior appendages of the male short, 

 blackish fuscous; base of the wings yellowish, a basal, longitudinal 

 stripe, which is sometimes double upon the posteriors, an abrupt 

 band upon the middle and a pterostigmatical band, sometimes 

 also the apex fuscous; pterostigma large, rufo-fuscous ; membra- 

 nule white; fourteen antecubitals ; ten postcubitals ; four, or some- 

 times three discoidal areolets. 



Length 37 45 millim. Alar expanse 66 77 millini. Ptero- 

 stigma 5 millim. 



Hab. New Jersey, Massachusetts, Maryland (Uhler); New 

 York, Savannah, Georgia ; Carolina, Florida (Osten Sacken). 



3. L. nodisticta! 



Libellula nodisticta Hagen ! 



Fulvous, clothed with white hair ; front pale, brassy-fuscous 

 above, terminated with black; dorsum of the thorax incanous, each 

 side fuscous, sides pale with four sulphur spots ; feet black, base 

 of the femora fuscous; apex of the abdomen attenuated, fulvous, 

 with a broad dorsal, black stripe ; appendages short, black ; wings 

 hyaline, a basal fascia and a nodal point, black ; pterostigma nar- 

 row, black ; rnembranule white. Male. 



Thirteen antecubitals; nine postcubitals; four discoidal areolets. 



Length 47 millim. Alar expanse 77 millim. Pterostigma 4 

 millim. 



Hab. Mexico (Saussure). it is allied to Lib. quadri maculata. 



