177 



rufous above, the apex black, anterior femora beneath, luteous ; abdomen 

 moderate, slender, cylindrical, narrow behind the inflated base ; fuscous, spotted 

 with blue ((^) or yellow ( $ ), segments 3-10 with two large, apical spots, seg- 

 ments 3-8 with two triangular spots upon the middle, and a basal, divided spot 

 each side, segment 2 with a medial interrupted fascia, and a broad apical one, 

 blue or yellow ; superior appendages of the male black, long, foliaceous, narrow, 

 the base narrower, inwardly carinated, straight, curved inwardly before the apex, 

 an elevated triangular lamina above, and a longer tooth placed more inferiorly; 

 the apical tip acute, curved downwards; the inferior appendage, pale fuscous, 

 one-half shorter, elongately triangular; appendages of the female moderate, 

 fuscous, foliaceous, broader; wings hyaline, those of the female towards the apex, 

 subflavescent, pterostigma short, fuscous, or luteous ($); membranule fuscous, 

 the base white ; 16-17 antecubitals; 8-9 postcnbitals. Length 65-67 mm. Alar 

 expanse 90-100 mm. Pterostigma 3-35 mm." Calvert (Odonata of Baja Cali- 

 fornia, p. 503) describes the superior appendage as having the apex distinctly 

 forked when viewed in profile. " Front wings with discoidal triangle 4-6-celled, 

 internal triangle 2-celled, rarely free, 3-4 other median cross-veins, 1-2 supra- 

 triangulars, first and sixth or seventh antecubitals thicker. Hind wings with 

 discoidal triangle 4-5-celled, internal triangle 2-celled, 2-3 other median cross- 

 veins, 1-2 supratriangulars, first and fifth or sixth antecubitals thicker. Male: 

 anal triangle 3-celled ; 10 with a small, median, basal, dorsal tooth and a smaller 

 one on each side. Abdomen (J" 47-51, 9 49. Hind wing (^ 43-47, $ 45-47." 

 (Calvert, Odonata of Baja California, p. 508). 



11. Didymops transversa Say. Simonton Lake, May 15 and 20, 1900; and 

 St. Joe River, Elkhart, May 29, 1900. R. J. Weith. 



12. Epicordulia princeps Hagen. St. Joe Kiver, Elkhart, July 7, 1900. E. 

 J. Weith. 



13. Males of Sympetrum rubicundidum aij^ Sympetrum obtrusum exhibit but 

 little diSerence in coloration. Ruhicundulum has the face light brown, yellowish, 

 darker above ; obtrusum has the face white. The general body color of females of 

 the two species is distinctive. Obtrusum and rubicundulum seem specifically dis- 

 tinct for the following reasons : both sexes offer differences in color and structure ; 

 they occur together, often in the same isolated swamp ; and there seem to be no 

 intermediate forms. On September 9, 1900, obtrusum, rubicundulum and albifrons 

 were associated together in a small swamp surrounded by woodland in Wells 

 County, near Bluffton. At a glance both sexes of albifrons may be recognized by 

 the face, white below, shading above into a clear china blue, the frontal vesicle 

 being of the same color. 



