158 DRAGONFLIES OF NORTH AMERICA 
turned forward over its head. A big nymph taken in the fingers will 
often use its tail spine defensively. 
The normal food of these nymphs in the streams of southern Califor- 
nia, as determined by stomach examinations, is mayfly nymphs and 
midge larvae. 
117. Cordulegaster obliquus Say 
Say ’39, p. 15: Mtk. Cat. p. 77: Garm. ’27, p. 123. 
Length 74 mm. Expanse 96 mm. Me., Pa., Wis., Ill. 
A fine large species having a peaked occiput with a bald spot in the middle, 
and a Gomphus-like middorsal line of spots on the abdomen. Face pale, with 
the clypeus and labral border obscure brownish. Hind border of the yellow 
occiput hair fringed only at the sides. Pale stripes of the front of the thorax 
narrowed to a point below and strongly divergent, the pale side stripes strong 
and regular. Legs black, brownish at base. Wings hyaline, with costa and stigma 
brown. The middorsal line of pale spots on the abdomen is widened in the 
middle on each of segments 2 to 6; it is still more widened on 7 and 8; and 
reduced to a little basal transverse dash on 9; 10 and appendages wholly 
black. 
The senior author has published an extended account of the habits of 
this species in Entom. News, 16: 3-6, 1905. 
118. Cordulegaster fasciatus Rambur 
Ramb. ’42, p. 178: Mtk. Cat. p. 77. 
Length 73 mm. Expanse 92 mm. S.E. States 
This is a fine, large, reddish brown species. Face yellowish, with brown 
bordered labrum and brown anteclypeus. There is a narrow brown line before 
the ocelli. The occiput is brownish black clothed with thin brown hairs. The 
two yellowish stripes on the front of the red brown thorax are cuneiform, pointed 
and divergent downward. The pale side stripes are broad and regular, and in 
the dark area between them there is a suggestion of an included narrow pale 
line. Legs black, reddish at base. Wings hyaline, a little tinged with yellow or 
brown in old specimens; stigma reddish. Abdomen blackish with two midlateral 
rows of yellow spots on segments 2 to 8; the spots are triangular on 7, and almost 
bifid on 8. Auricles of the male yellow. Appendages black. 
119. Cordulegaster diastatops Selys 
Selys ’54, p. 101: Mtk. Cat. p. 76: Garm. ’27, p. 119. 
Syn: lateralis Scud. 
Length 60 mm. Expanse 80 mm. Atlantic States Me. to N. C. 
A trim blackish species with greenish stripes on the thorax and a line of 
obscure pale spots along the sides of the abdomen. Face greenish except for the 
clypeus and a narrow front border to the labrum. Occiput yellowish, except for 
