244 DRAGONFLIES OF NORTH AMERICA 
A dainty little white-faced species with black abdomen the base of which 
becomes pruinose blue with age. Face pale, including the whole of the frons. 
Vertex and occiput blackish, bare, shining. Thorax thinly clothed with pale 
hairs, obscurely colored, blackish in front, olivaceous on sides with darker color 
in depths of the first and third lateral sutures (vestiges of stripes 3 and 5). Legs 
black. Wings hyaline with short brown stigma and yellowish costal margin, 
conspicuously paler just beyond the stigma and on a few adjacent longitudinal 
veins. Basal black markings as in intacta. Slightly swollen basal abdominal 
segments yellow, narrowly ringed with black on carinae, becoming wholly 
pruinose blue with age. Abdomen beyond, wholly black, including appendages. 
228. Leucorrhinia proxima Calvert 
Calv. ’90, p. 38: Mtk. Cat. p. 167: Wlsn. ’09, p. 656: Ris ’12, p. 720: Walk. ’00, 
p. 420: Howe ’20, p. 85: Calv. ’23, p. 88: Garm. ’27, p. 284. 
Length 35 mm. Expanse 56 mm. Me. and N. H. to B. C. 
This is a dainty little white faced species with obscure brownish hairy thorax 
and black abdomen. Face white with margin of labrum black. Vertex and 
occiput blackish with tawny hairs. Thorax densely clothed with similar longer 
hairs; obscure brownish in front and paler at sides with indistinct markings, only 
the hindermost of which (stripe 5) conforms to a lateral suture. A broad blackish 
area covers the lower end of the humeral suture and extends below the thorax. 
Legs black. Wings hyaline with tawny stigma followed by the usual pale streaks 
on veins and with the hinder of the basal brown streaks on the hind wing well 
developed to rearward along the membranule. Basal half of abdomen white 
hairy; the swollen basal segments mostly paler on sides, narrowly crossed with 
black on sutures, beyond which all is black, including appendages. 
229. Leucorrhinia borealis Hagen 
Hag. ’90, p. 231: Mtk. Cat. p. 166: Walk. ’16, p. 416: Ris 712, p. 716. 
Length 38 mm. Expanse 64 mm. Hudson’s Bay 
This species was described by comparison with the European L. rubicunda 
from which it is said to differ by having a large red spot on the dorsum of ab- 
dominal segment 8. In that species spots are present on the preceding segments 
only. The species is unknown to us. 
48. PacHypDIPLAx Brauer 
Dragonflies of medium size, olivaceous in color and striped with 
brown, becoming wholly pruinose blue with age. 
There is a wide space without cross veins before and beneath the 
stigma. The space beyond the fore wing triangle is strongly narrowed 
toward the wing margin. Vein Cu springs from the outer side of the 
triangle in the hind wing. There is but one species. 
The nymph of Pachydiplax (Ndm. ’01, p. 527) is smooth and de- 
pressed of body with wide head. It has no dorsal hooks. The superior 
abdominal appendages are one third shorter than the inferiors. 
