39 
line behind the eyes is quite broad, seldom broken up, and is distinct 
in the darkest specimens. The humeral (entering) angles of the pos¬ 
terior margin of the pronotum are more rounded and not so sharply 
defined as in spretus ; the median carina is usually more distinct on 
the anterior lobes, while the lateral carina? are rather more obtuse 
and not so well defined; the punctures on the posterior lobe are more 
distinct. The wings extend but slightly beyond the extremity ol the 
abdomen, usually less than one-tenth their length. In this species 
and atlanis the intercalate vein is present in the elytra, (notwith¬ 
standing the assertion of Stal to the contrary) dimly and imperfectly 
it is true, but it can be clearly distinguished for more than half the 
length of its course. In spretus it is wanting, its place being marked by 
the line of union between the two rows of cells. The fuscous spots or dots 
are not so conspicuous or widely spread over the apical portion of the 
elytra, and the elytra are narrower and straighter. As a very general 
rule the external face of the posterior femora is black or brown, the 
lower margin and lower half of the inner face bright coral, red ; when 
these colors are well defined there is a yellow space or stripe between 
the red and black; but these markings are subject to considerable 
variation, the red being sometimes entirely wanting, the external 
face dark and the lower margin yellow, sometimes the dark is replaced 
by a pale olive. The tibiae are most generally bright red, but this 
character is not without its exceptions. Usually there is a pale ray 
extending from the base of the wings to the posterior coxa, but is oc¬ 
casionally wanting in dark specimens and is generally absent in spre¬ 
tus. The prosternal spine is notso distinctly quadrate at the base as in 
spretus , tranverse, flattened behind and not regularly conical, but 
somewhat sub-cylindrical to the broadly rounded and very blunt 
apex. 
Malt. —The most constant difference between the species is found in 
the form of the last ventral segment of the male; in femur-rubrum 
this segment, although strongly curved upwards, as in spretus , is not 
so distinctly narrowed toward the end but rounded, and instead of be¬ 
ing notched toward the end is squarely truncate, presenting a sharp, 
horizontal and almost semi-circular margin (see fig. 7). Below the tip, 
on the posterior face of the segment, is a rather large, tranverse, gash- 
like indentation. The cerci are about the same length as those of the 
male spretus , and about the same width at the base. The little tooth- 
like appendages at the base of the super-anal plate are elongate and 
slender as in spretu* and are sinuate. 
In addition to the characters mentioned in the original description 
of atlanis I would call attention to the following differences between it 
and spretus on the one side and femur-rubrum on the other. 
Female. —As compared with the female of spretus the wings are short¬ 
er extending but very slightly beyond the tip of the abdomen, not dif¬ 
fering perceptibly in this respect from femur-rubrum ; the elytra are 
narrower, curved upward very slightly at the apex, very few spots or 
dots on the apical portion and these minute and dim ; the inner field 
is almost always immaculate; the posterior half of the intercalate 
vein apparent. The wings pellucid, but when living have, next the 
base, a bluish-white tinge ; a larger portion of the nerves and nervules 
dark. The black stripe on the side of the pronotum nearly always ap- 
