98 DRAGONFLIES OF NORTH AMERICA 
45. Gomphus lineatifrons Calvert 
Calv. ’21, p. 222 (figs.). 
Length 69 mm. Expanse 90 mm. Mich., O., Ind., Ill., Wis. 
Similar to the preceding species in stature and appearance, but slightly 
smaller. The uppermost black line across the face is narrow; the thoracic stripes 
of the first pair are almost parallel sided; the hind lobe of the prothorax is not 
wholly black in the middle dorsally; stripe 4 is interrupted in the middle, and the 
spot on the dorsum of the 9th abdominal segment is half as long as the segment. 
Subgenus Styturus Needham 
These are large Gomphines of elongate form having but little dilata- 
tion of the club segments of the abdomen. The posterior genital 
hamules of the male are strongly inclined forward at their tips (the 
anterior, very small and sequestered), and the subgenital plate of the 
female is very short, almost rudimentary. 
The nymphs of this group are of very elongate form with abdomen 
narrow, hardly wider than the head, and slowly tapering with lateral 
spines on 6 to 9; the ninth segment is very long and the tenth is very 
short. The tibial burrowing hooks are almost wanting. The labium is 
long and narrow with the sides of the mentum convergent toward the 
middle hinge. The end hook of the lateral lobe is long and strong, and 
incurved at almost a right angle; the teeth before it are very few and 
increase in size proximally. The differences between the known species 
may be tabulated as follows: 



The Nymphs 
Relative lengths Dorsal 
Name Length |————————_—_———_|_ igoks_| Spines of 9| Teeth Described by 
8 9 10 | app 
spiniceps 40 6 10 2 3 on 9 =10 2-3? | Cabot ’72, p. 5T 
plagiatus 35-36 8 10 2 2 ea9 24 of 10 2-4 Hag. ’85, p. 269* t 
notatus 36-38 8 10 2 3 “9 =10 3 Ndm. '03, p. 267T 
olivaceous 38 7 10 4 4 «9 ¥ of 10 3 | Kndy.’17, p. 554T 
intricatus 27 8 10 4 4 “0 =10 3 Kndy. ’17, p. 570T 

* Also by Ndm. & Hart ’01, p. 84. 
t+ Also by Walker ’28, p. 79. 
KEY TO THE SPECIES 
Adults 
 FACOCDrOW en cs sietoced oe ac Pee ee ee plagiatus, p. 101 
Face yellow... 2.) 22 hon no eee oe ee ee 4 
2 Stripes 4 and 5 broad. and fused ii... 6... deen spiniceps, p. 101 
Stripes 4 and 5 very narrow or obsolete..............+.--+- 3. 
