TACHOPTERYX 55 
has its outer side longest and angulated at a point whence springs a 
trigonal supplement. There are a number of supernumerary sectors 
springing from vein Rs and M4, and running rearward to the wing 
margin. 


ane 
Fia. 24. Wings of Tanypteryx hageni. 
2. Tachopteryx thoreyi Hagen 
The Eastern Grayback 
Hag. ’57, p. 373: Mtk. Cat. p. 75: Davis ’13, p. 18: Kndy. ’17, p. 190 (Figs): 
Howe 717, p. 24: Howe ’23, p. 126. 
Length 78 mm. Expanse 106 mm. Eastern U. S. 
This white-nosed, gray, archaic-looking dragonfly, has a hairy thorax that is 
striped, and an abdomen that is ringed with black. The carina is solid black 
but has no closely bordering stripes. A diffuse black stripe overlies the humeral 
suture and turns up at its lower end to rearward, ending just before the spiracle. 
Another similar stripe covers the third lateral suture, likewise turned rearward 
at its lower end in a long subparallel blackish mark that reaches to the base of 
the abdomen. The legs are black. The wings are hyaline, with black stigma. 
The abdomen is mostly yellow on the basal segment, mostly yellow above and 
black on the lateral margin on 2 to 7, with a small spot on the anterior half and a 
large quadrate one on the posteri or half of each of these segments and with both 
broadly on successive segments, connecting laterally with the black of the side 
margins on 6 and 7. Pale areas reduced to small basal spots on 8 and 9, and 10 
and appendages wholly black. 
Davis (718, p. 18) says of this dragonfly that it is often found resting 
on the trunks of trees where, owing to its gray color it can hardly be 
detected. 
Williamson (’00, p. 398) thus describes the habitat and habits of 
this species, as found by him in a swampy tract, an acre or two in 
extent, in a small valley in western Pennsylvania: 
