August — October 1S90.] 



PSYCHE. 



385 



I have a dozen of both sexes young and 

 adult from Canada to Florida. With 

 an equally large material of L. lydia 

 and of L. axillena it seems to be cer- 

 tain that all belongtothe same species. 



8. DiPLAX RUBICHNDULA Say. 



Libellula rublcitndula Say, Journ. 

 acad. nat. sci. Philad. 1S39, ser. i, v. 

 8, 26, 14. 



Dlplax I'liblcundida Hagen, Syn. 

 Neur. N. A. 1861, 176, 6 — Proc. Bost. 

 soc. nat. hist. 1S73, v, 15, 267, 17; 

 377, 10; 1S75, V, iS, 73, 3 — Scudd. 

 ibid, 1S66, V, 10, 219. 



Rufescent front and mouth parts yel- 

 lowish ; a narrow black band before the 

 eves between vertex and front ; vertex 

 brown, paler on tip, villous ; eyes rufes- 

 cent in life, behind olivaceous with two 

 transversal darker marks ; antennae 

 black ; prothorax rufous, hind border 

 with two large rounded lobes, densely 

 ciliated on border, thorax rufous, (3') 

 greenish brown ($), sides same color 

 more yellowish beneath ; legs black, an- 

 terior femora sometimes the intermedi- 

 ate and posterior, luteous beneath at the 

 base ; abdomen long, slender, saguineous 

 (adult male), or yellowish with a macu- 

 lose lateral black stripe, except at the 

 base (9) ; appendages, rufescent; sup- 

 erior ones of the male longer, apical 

 half recurved, apex acute, beneath upon 

 the middle with a stouter tooth, dentic- 

 ulated anteriorly ; inferior appendage 

 shorter, triangular, exceeding somewhat 

 the tooth of the superior ones, the apex 

 a little excised ; the genital hamulus 

 rather long, very bifid, the external 



branch broader, triangular ; the internal 

 one a little longer, narrow, subin- 

 curved ; the genital lobe short, triangu- 

 lar ; the apex narrow ; anterior plate 

 widely notched on the tip ; penis with 

 two shorter pale apical setae ; appenda- 

 ges of female cylindrical, pointed; vulvar 

 lamina small, triangular, the base in- 

 flated, bifid by a channel to the base, 

 forming two conical pointed, recurved 

 lobes; concave inside; wings hyaline, 

 the extreme base yellowish ; pterostigma 

 quadrangular, fusccjus, at both sides 

 paler ; membranule wdiite ; antecubit- 

 als 7 (S) ; postcubitals 7 (7-9) ; 3 dis- 

 coidal areolets. 



Length 32-37 mm ; alar expanse 50- 

 58 mm. ; pterostigma 2 mm. 



Habitat : Massachusetts summer 

 to very late fall ; New Hampshire, Aug- 

 ust, September ; Maine : New York ; 

 New Jersey ; Pennsylvania ; Maryland ; 

 Washington, D. C, ; Indiana (Say) ; 

 Illinois ; Lake Superior ; British 

 America ; 



9. DiPLAX MADiDA Hagen. 



Diplax madida Hagen Syn. Neur. 

 N. A. 1 86 1, 174,2 — Proc. Bost. soc. 

 nat. hist. 1875, v. 18, So, 11. 



Rusty brown, subvillous ; front and 

 mouth parts, paler, reddish, vertex, in- 

 flated, reddish, tip truncated a little 

 notched ; occiput pale brown, villous 

 behind ; antennae black ; eyes behind 

 yellowish, with three dark brown 

 transversal bands ; prothorax darker 

 above ; the hind border with two paler 

 large rounded lobes, densely ciliated on 

 the border ; thorax dark rusty brown 



