193 [Scudder. 



and sometimes those between with a lateral stripe, black ; append- 

 asjes reddish-brown ((5), or yellowish-brown (teneral S), tipped with 

 black (5), or fuscous (teneral 3); or basal half yellowish-brown, 

 apical half black (teneral ?) ; antecubitals, 15-17 ; postcubitals, 9-11; 

 three rows of discoidal areolets. 



Length, 1.42 inches ; alar expanse, 2.24-2.48 inches ; pterostigma, 

 .10 inch. Adult 5,2; teneral ( <5 , 3 ; $ 1). 



Dythemis frontalis (Burm.) Hagen. 



Hagen has added very little to the previous descriptions of this spe- 

 cies by Burmeister and Selys, and evidently had before him only the 

 specimens of these authors, neither of whom mention the ? , which 

 differs considerably from the $ , at least in wanting the pruinosity 

 of that sex, and in the size of the expanded terminal abdominal 

 segments. 



? . The face in front is pale brownish-yellow (in life pale greenish-yel- 

 low) ; above and on the vertex, but not on the sides, greenish-chalybe- 

 ous (in life bronze-black with purplish reflections) ; labrum black ; 

 behind the eyes yellow, broken by transverse fuscous lines; thorax 

 fuscous (in life dark fuscous) with an humeral streak, angulated on the 

 inside at the base of the wings, and three pleural stripes dull yellow 

 (in life lemon-yellow) ; not only the anterior but also the middle 

 femora pale inside (in life yellow), and not only inside but posteriorly 

 and at the base altogether ; wings h}'aline, the extreme base of the 

 posterior pair, next the principal veins fulvous ; a spot on the anterior 

 half of the apex of the wings, in the middle of which the pterostigma 

 stands, barely tinged with luteous ; the membranule mentioned by 

 Selys as fuscous and by Hagen as black, is dark fuscous ; the width of 

 the swollen base of the abdomen is to that of the expanded portion, 

 extending from the middle of the sixth segment to the ninth (inclu- 

 sive) as four to five ; abdomen black (so in life), the sides with an 

 upper and lower longitudinal irregular streak of brownish-yellow (in 

 life lemon-yellow) most conspicuous on segments 1-3, only present as 

 a line on the basal half of segments 5-6, as outer and inner spots or 

 streaks on basal half of 7-8, more conspicuous on 8, and wanting on 9; 

 antecubitals 14 ; postcubitals 10 ; 



Length 1.84 inches ; alar expanse 3.20 inches ; pterostigma .10 inch. 



The 6 differs from the ? in the following particulars : — the thorax 

 is bluish pruinose (as in life) with the markings like the 9 faintly dis- 

 cernible ; only the anterior femora pale inside and at the base, though 

 the middle femora have those parts fuscous rather than black ; the 

 posterior pair of wings do not have the base so much tinged with 

 ftunose, if at all, and the luteous spot at the apex of all the wings 



PROCEEDINGS B. S X. H.— VOL. X. 13 PEBSUAET, 1866. 



