62 DRAGONFLIES OF NORTH AMERICA 
3. ProGomPpuus Selys 
This genus, as at present constituted, is a 
Rs. rather heterogeneous lot of about a dozen tropical 
American species, and the one widely ranging and 
very variable North American species described 
below. This species has the nodus situated a little 
beyond the middle of the fore wing. In both wings 
the triangle is broad, and its outside is angulated 
at the point of origin of the trigonal planate. In 
the fore wing it is usually divided into 3 cells and 
in the hind wing into 2. The inferior abdominal 
appendage of the male is rather long and very 
deeply divided. 
The nymph (Cabot, ’72, p. 6- Hagen, ’80, p. 247; 
and Ndm. and Hart, ’01, p. 55) is readily recognized 
by the cylindric and upturned fourth segment of 
the antennae and by the indrawn bases of the 
Fig. 27. Progom- middle legs. It is a superb burrower and lives in 
phe nymph: the sandy beds of both lakes and streams. 

3. Progomphus obscurus Rambur 
Rmbr. ’42, p. 170: Mtk. Cat. p. 79 (as Gomphoides obscura): Howe ’18, p. 27: 
Kndy. ’21, p. 596: Davis ’13, p. 19: Wlsn. 712, p. 190: Wmsn. ’20, p. 100: 
Howe ’23, p. 127: Smn. ’26, p. 19. 
Syn: borealis McL.t 
Length 60 mm. Expanse 75 mm. U. S. generally. 
This is a handsome greenish gray species, striped with brown, and with 
yellow knee caps. Face and occiput greenish. Thoracic stripes of the first pair 
narrowly separated at the pale carina, widened strongly forward and abbreviated 
at the collar, confluent above with stripe 2. Stripes 2 and 3 of nearly equal width 
confluent above, then separated by a small triangular spot, then fused again, 
and then separated by a narrow yellow line below. Stripe 4 obsolete, or an 
exceedingly faint trace in the bottom of a crooked suture. Stripe 5 complete. 
Wings hyaline, brownish at base, as far out as basal crossveins, Costa yellow, 
Stigma brown. Legs yellowish basally almost to the knees, brown beyond. There 
is a distinct yellow kneecap covering the base of the tibia externally. The 
middorsal row of abdominal pale markings begins on segment 2, and continues 
as somewhat abbreviated triangles on 3 to 7, on 7 being half as long as the 
segment. Segments 8 to 10 are blackish above. The yellow of the little expanded 
side margins is full length on 7, divided into basal and apical spots on 8, and 
smaller apical spots only on 9 and 10. The superior appendages of the male 
are yellowish. 
+ Perhaps the west coast G. borealis of McLachlan should rank as a distinct 
species. Kennedy thought so, and gave some good reasons (717, p. 527). 
