432 



ENTOMOLOGICAL NEWS. 



[Nov., '08 



Platycordulia xanthosoma n. sp. 



Length of abdomen, including appendages, 38 mm. ; hind wing, 36 

 mm. ; hind femur, 9 mm. 



Entire insect yellow or yellowish. Abdomen, excepting segment i, 

 basal half of 2 and all of 10, darker than thorax ; 5-8 or 9 each with a 



Platycordulia xanthosoma cf Profile view of segments 9 and 10. 



lateral basal paler spot. Head rounded, eyes contiguous for a distance 

 about equal to the width of the vesicle. Wing membrane pale yellow- 

 ish with clear yellow markings as shown in the figure of the wings 

 (the photographic process produced in the figure a greater contrast 



Dorsal view of appendages. P rofi ! e Y iew of accesory genitalia of 



abdominal segment 2, above. Ventral 

 view of inferior appendage, below. 



in the color of the membrane in general and the yellow markings 

 than appears to the eye.) Membranule white, posterior third dark 

 brown, this brown color in the hind wing extending across the anal 

 triangle and broadly margining cross-veins in the immediate wing 

 area, not extending into the anal loop. 



Some venational characters may be briefly compared with 

 the two species of N euro cor dulia. Certain characters of 10 

 males and 7 females of N. yamaskanensis were kindly furnished 

 me by Prof. E. M. Walker. The supertriangle of front wing 

 is free in 20. wings $ and 12 wings 9 yamaskanensis, and I 

 wing $ and 4 wings 9 N. obsolcta; crossed in 2 wings $ and 4 

 wings 9 yainaskanensis, I wing $ and I wing 9 obsoleta and 

 4 wings $ of P. xanthosoma. Supertriangle of hind wing free 

 in 22 wings $ and 16 wings 9 yamaskanensis, 2 wings $ and 



