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 1, 
basal half of 2 and all of 10, darker than thorax; 5-8 or 9 each with a 
Platycordulia xanthosoma 3—Profile view of segments 9 and Io. 
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 
; Profile view of accesory genitalia of 
Dorsal view of appendages. 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 Neurocordulia. 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 2 yamaskanensis, and 1 
wing ¢ and4wings ? N. obsoleta; crossed in 2 wings $ and 4 
wings 2 yamaskanensis, 1 wing 6 and 1 wing 2 obsoleta and 
4 wings ¢ of P. xanthosoma. Supertriangle of hind wing free 
in 22 wings é and 16 wings 9 yamaskanensis, 2. wings é and 
