ta O 
- ENTOMOLOGICAL NEWs. 433 
obsoleta, ‘iia 4 wings é xanthosoma; crossed in 1 
ge obsoleta. Two cubito-anal cross-veins in*front wing 
21 wings é and 16 wings @ yamaskanensis, 2 wings é 
sacs @ obsoleta; 3 cross-veins in 1 wing ¢ yamaska- 
sis and 3 wings é xanthosoma; 4 cross-veins in 1 wing ¢ 
a | One cubito-anal cross-vein in hind wing in 1 
ben $ yamaskanensis; 2 cross-veins in 21 wings $ and 16 
% yamaskanensis, and 2 wings é and 5 wings ? obso- 
_ Teta; 3 cross-veins in 4 wings 8 xanthosoma. In 2 males yama- 
_  Skanensis and 1 2 obsoleta the anal triangle is 2-celled, in 2 
__ @ #anthosoma 3-celled. Antenodals in front wing—yamaska- 
— nensis 9-11, obsoleta 7-8, xanthosoma 7-8; postnodals in front 
J — kanensis 6-9, obsoleta 7-10, xanthosoma 7-8 ; ante- 
in hind wing—yamaskanensis 6, obsoleta 5 (rarely 6), 
5: postnodals in hind wing—yamaskanensis 7-10, 
obs 8-10, xanthosoma 7-8. Rows of cells after triangle in 
___ front wing—yamaskanensis 2, obsoleta and xanthosoma 2 or 3: 
in hind wing—yamaskanensis 2 or 3, obsoleta 2, and xanthoso- 
‘ma 2-4 indefinite. Material studied by me—yamaskanensis 2 8, 
‘I 9; obsoleta 1 &, 2 @ and wings figured by Martin p. 38, 
__ Cordulines, Coll. Zool. Selys Longchamps; and xanthosoma 
38. « 
The abdominal appendages of Platycordulia xranthosoma are 
figured. They are separated at once from species of Neurocor- 
Msc ct F. sewhesonc a ny coleod oe 
ice two males of P. xanthosoma in my collection were taken 
§ at Wister, Oklahoma, one of them on June 4, 1907, by myself, 
_ the second on August 2, 1907, by Frank Collins, a boy who 
“5 ad Choctaw Nati Wister is situated in the northeast 
of the Choctaw Nation, a few miles south of parallel 35 
3 N., near the Poteau River, a southern affluent of the Ar- 
4 Ssocbay About a mile north of the town is a lake lying on 
the west side of the railroad. I was informed that this lake is 
artificial, caused by the fill for the railroad grade. At the 
present the lake has a surprising Odonate fauna. 
__ To mention two cases, Libellula cyanea and Ischnura 
__ ellicotti, hitherto not known west of Indiana, were here in 
