EURYGONA. 363 
metropolis of the genus being probably the valley of the Upper Amazons to the base 
of the Andes. Within our limits we now know of twenty species; three of these are 
found in Southern Mexico. Their numbers gradually increase as we approach Panama, 
where twelve species occur. No less than seventeen species are found between 
Nicaragua and Panama, and of these six pass southwards into Colombia and Ecuador, 
and one of them (£. crotopus) to the Amazons and Guiana. One species (H. abreas) 
has been recorded from Arizona*. This is evidently allied to L. mys, of which E. sergia 
is the Central-American representative, but apparently distinct. 
As is well known, the number of subcostal branches in the. primaries in this genus is 
variable, and we have used this character to subdivide it into three sections according 
as the species have four, three, or two of these branches, those with three being much 
the most numerous. 
E. aurantiaca has four branches to the subcostal of the primaries, two before the 
cell and two after it. The upper radial meets the subcostal some way beyond the end 
of the cell; the middle discocellular is perfect and meets the subcostal a little beyond 
the second branch; it runs almost in a line with the lower radial, making a slight angle 
where the atrophied lower discocellular meets it ; this latter joins the median some way 
beyond the second branch; the costal side of the cell is shorter than the median side. 
The secondaries appear to be without a basal nervure ; the upper discocellular runs in a 
line with the radial and meets the subcostal beyond the first branch; the lower disco- 
cellular is atrophied for its upper half, it makes a large obtuse angle with the upper 
discocellular and meets the median some way beyond the second branch ; the costal side 
of the cell is much shorter than the median side. The primaries of E. aurantia are of 
similar structure, but differ in having only two branches to the subcostal, both of them 
being emitted before the end of the cell; in other species, such as L. argentea &c., there 
is a third small subcostal branch near the apex. In the front legs of the male the 
trochanter is inserted about the middle of the coxa, the femur = $ coxa and is slightly 
dilated towards the distal end, the tibia = 2 coxa; tarsus = femur. The terminal joint 
of the tarsus of the female (Z. auwrantia) = second + third joints ; it has a setose pad on 
the under surface; the third and fourth joints terminate beneath with two strong 
spines. The terminal joint of the palpi is short and oval; the second joint is nearly four 
times as long as the first joint; the basal and second joints are subequal, the latter being 
the stouter of the two. The antenne have thirty-six joints, the terminal ten forming a 
very distinct club. The secondary sexual organs in E£. awrantiaca have the tegumen 
with its two lateral hooks of the usual shape, but in addition there is a long dependent 
lobe from the base of the lateral margin, slightly serrated on its outer surface towards its 
extremity. The harpagones are subtriangular and simple, setose on the lower edge and 
towards the outer angle. The penis is short and stout, and there is apparently no strap 
connecting it with the base of the harpagones. These organs, in F. awrantia, are quite 
* W. H. Edwards, Trans. Am. Ent. Soc. ix. p. 36 (1881). 
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