CALVERT: MACROTHEMIS AND ITS ALLIES. 
313 
Genital lobe of J with no posterior process. 
Color at base of wings of 9 reaching at most only to sub¬ 
median cross-vein, of £ not so far. Hamule of J 
sickle-shaped ...... mendax 
Color at base of wings of 9 reaching half-way to the 
nodus (front) or to the origin of the subnodal sector 
(hind) for almost the entire width of wing, of $ to 
submedian cross-vein. Hamule of $ less strongly curved 
than sickle-shaped ..... nubecula 
Genital lobe of $ with a posterior process, hamule sickle- 
shaped ........ postlobatci 
Sides of thorax predominantly dark (brown or black). 
Labrum mostly yellow. 
Size smaller, abdomen 30 mm., hind wing 26. grencidensis 
Size larger, abdomen 36-38, hind wing 31-35. praecox 
Labrum mostly black. 
Lateral labial lobes mostly yellowish, inner posterior fourth 
black; pale spot on each side of dorsum of 7 nearly as 
wide as that side of the segment on which it lies, its 
length but little more than its own width, its anterior 
and posterior margins each bilobed . . rapax 
Lateral labial lobes with at least the inner half black, 
elsewhere yellowish; pale spot on each side of dorsum 
of 7 one half as wide as that side of the segment on 
which it lies, its length four times as great as its own 
width, margins not lobed .... pertinax 
In the above table grenadensis may perhaps be incorrectly 
located as I have seen no undoubted specimens. 
1. B. mendax Hagen. PI. 1, fig. 5, pi. 2, figs. 23, 30. 
Dythemis m. Hagen, Syn. Neur. N. Amer. p. 164, 1861. Cal¬ 
vert, Proc. Cal. acad. sci., (2), vol. 4, p. 529, pi. 16, figs. 56, 57, 
1895. 
Hagen’s types have little or no metallic blue on the vertex and 
upper surface of the frons, but a male from Round Mt., Texas, 
otherwise not distinguishable, has this color well marked. The 
large pale spot on either side of the dorsum of 7 .distinguishes this 
species from praecox , pertinax , postlobatci , and perhaps grena¬ 
densis. 
Vulvar lamina excised, lobes rounded, diverging at a right angle 
(PI. 2, f. 30); this aids in distinguishing from praecox. 
