HELOCORDULIA 181 
all during the day were breaking the water in their efforts to catch Trameas,— 
always fruitless efforts, so far as I observed. I waded at once to the spot. The 
strand of eggs, possibly five inches in length, with a specific gravity slightly 
greater than water, was hung between two horizontal slightly submerged sedge 
leaves. 
139. Tetragoneuria stella Williamson 
Wmsen. in Mtk. ’11, p. 96. 
Length 40 mm. Expanse 66 mm. Fla. 
Similar to the preceding but without brown markings on the wings. The 
thorax is yellowish clothed with pale hairs. Stripes 3 and 5 of the thorax are 
widened above and 38 is connected below with a blackish spot at the base of the 
middle legs. Legs reddish brown, paler at the base. 
140. Tetragoneuria spinigera Selys 
Selys ’71, p. 269: Mtk. Cat.p.126: Mtk. 711, p.127: Walk. 713, p.161: Garm.’27, 
p: 211. 
Length 38 mm. Expanse 58 mm. B. C. and Wash. to Wis. and Ga. 
This species is similar to cynosura except that the frons always bears a black 
T-spot above, and the hair of the thorax is much mixed with brown, and the 
general coloration is a little darker. It is the most northern of the genus. 
141. Tetragoneuria canis McLachlan 
McL. ‘86, p. 104: Mtk. Cat. p. 125: Mtk. ’11, p. 96: Garm. ’27, p. 211. 
Length 40 mm. Expanse 64 mm. Ont., N. S., Wash. 
Similar to cynosura, lacking the T-spot on the frons. Hair of thorax grayish 
giving the body a rather light appearance. Color of wings confined to a few 
basal spots; membrane often flavescent. 
142. Tetragoneuria spinosa Hagen 
Hag. ’78, p. 188: Mtk. Cat. p. 127: Mtk.’11 p. 96. 
Length 40 mm. Expanse 64 mm. Wis. to Ga. 
Similar to the preceding species, differing in the form of the male abdominal 
appendages as shown in figure. A doubtfully distinct species. 
31. HreLtocorpuLtia Needham 
These are small cordulines, that have the antenodal cross veins of the 
wings prettily spotted with brown. The stigma is narrow and very 
oblique at its ends with two cross veins touching its rear border. There 
are six antenodal cross veins in the hind wing. There is a single cross 
vein in the triangle of the front wing but none in that of the hind wing. 
The anal loop is rather squarely truncate at the distal end and there are 
generally two cubito-anal cross veins present. 
