xxxiii, '22] ENTOMOLOGICAL NEWS 69 



Deplanata Ramb. PI. IV, fig. 9. North Carolina, Georgia and 

 Florida. Found by the writer about muddy ponds at Raleigh, N. C 



The broad lateral lobes associate this \vith the angcllna-4- 

 inaculata line. Julia appears to be the primitive species of this 

 group in that specialization increases, from Julia in the north 

 to dcplanata in the south, in the increasing length of the medial 

 lobes and in the decrease in size, so that dcplanata is the small- 

 est species in the genus. This distribution and relationship to 

 Eurasian species suggests an origin of this group in northern 

 Eurasia and a migration to America later than the migration 

 of the stocks of the semifasciata, foliata, nodisticta and com- 

 posita groups which all show a preference for warmer climates 

 than does julla. Geologists tell us that the opportunities for 

 the migration of warm climate species existed largely before 

 the Miocene, but that a migration of northern species came in 

 the late Miocene and in the Pliocene. Julia and c.rusta at least 

 are distinct species, probably also dcplanata. Ris 13 states that 

 "the habitus difference is greater between jidia and c.vusta than 

 between c.vusta and dcplanata." This might be expected if 

 julia is the most primitive of the three. 



Group 6. Subornata Hagen. PI. IV, fig. 10. Kansas and Texas 

 to Nevada and southern California. Found about semidesert, alkali 

 ponds. 



Lydia Drury. PI. IV, fig. 11. Newfoundland to British Columbia 

 south to Florida and California. Any permanent pond. 



These are a branch of the angelina-4-maculata line because 

 of their widened lateral lobes. Subornata is the more primi- 

 tive in the unfused wing-bands of the male, in the less broad- 

 ened lateral lobes of the penis and in the less deeply divided 

 fork on segment one of the male. 14 



In this series an adventitious wing-band has appeared. It 

 is narrow and appears at the inner end of the stigma. In the 

 lemale of sithnniata it is free; in the male of the same species 

 it is fused with the nodal band by a paler area. In l\dia it is 

 more differentiated sexually. In the male it has become com- 

 pletely fused with the nodal band, thus giving the broad band 



13 Libellulinen, Coll. Selys, p. 259, 1919. 



14 Williamson. Plathcmis subormita. Ent. News, Nov., 1906, p. 351. 



