PARAIULUS. 55D 
notch and spiniform process at the distal end on the inner side; 
posterior branch of posterior pair forming a broad lamella curved 
forwards apically; sterno-coxal plate of appendages of second pair . 
shallowly emarginate behind . . . . . «©. 1. 1. we ss «@mulensis, sp. n. 
6°. Apex of admedian branch of anterior pair of seventh segment without 
notch and spine; posterior branch of posterior pair slender, styliform ; 
sterno-coxal plate of appendages of second pair deeply emarginate 
behind. 2. 2. ew eee we ee ee ee ew ww. aztecus, SP. 1. 
Females. 
a. Genital sclerites unjointed, inferiorly acuminate, not protected in front by a 
vertical unpaired plate, but succeeded by a T-shaped plate. . . . . amulensis. 
6. Genital sclerites bisegmented, protected in front by a vertical unpaired plate 
expanding at its inferior extremity ; no separate T-shaped sclerite behind. 
a’. Distal segment of genital sclerites slender and ine below the 
extremity of the anterior plate . . . . oe . 2 « « olmecus. 
. Distal segment of genital sclerites short, thick, obtuse, not projecting below 
the extremity of the anterior plate. 
a’. Pores less than their diameter from the sulcus; caudal process long 
and distally narrowed ; third tergal plate inferiorly produced . . . aztecus. 
6°. Pores at least twice their diameter from the sulcus; caudal process 
triangular; third tergal plate not inferiorly produced. . . . . . stylifer. 
1. Paraiulus amulensis, sp.n. (Tab. V. figg. 9, 9 a-d.) 
Q. Colour: segments yellow above, with median dark central line; lateral surface fuscous above, yellow 
below ; head and anterior segments blackish; anal segments yellow; legs yellow. 
Head smooth ; eyes forming a large triangular patch. Antenne with segments from the second to the sixth 
decreasing progressively in length. irst tergite with a single ridge above its lateral angle. Segments 
smooth and shining to the naked eye, but in reality finely striolate, the striole running longitudinally ; 
anterior half of segments transversely grooved in front; posterior half longitudinally and obliquely grooved 
nearly up to the pore, which is well behind the transverse sulcus; the latter deep. Sterna smooth. Anal 
sternite broadly triangular ; anal tergite furnished with a long and very acute caudal process. Second 
segment with its lower portion on each side produced inferiorly and inwardly in front of the generative 
apparatus. The latter consisting of a pair of large vertical plates, lightly convex in front, rounded above, 
with fairly straight outer margin, and acuminate below ; the proximal half of the inner border of each in 
contact with that of its fellow of the opposite side, its distal half obliquely diverging so that an angular 
space is left between the two sclerites, the distal portion of the outer margin directed obliquely inwards, 
and where it meets the obliquely outwardly directed inner edge arises a short acuminate process projecting 
outwards and downwards. Behind these sclerites lies a transverse plate about six times as wide as long, 
with an anterior median angular notch and slightly recurved external angles, (Text-figg. 3, 3a, p. 56.) 
3. Like the female in colour, sculpturing of tergites, &c. 
First tergite very wide laterally, without ridge above marginal groove. Second segment of mandible with two 
subequal prominences. Genital organs: legs of first pair massive, especially the penultimate and ante- 
penultimate segments, the former nearly as thick aslong; the latter broad at the base, narrowing distally ; 
distal segment small and shortly pedunculated. Legs of second pair with the median processes expanded 
at the distal end externally, the groove for the penis on the basal plate widely and shallowly concave, the 
palp longer than the median processes. Anterior pair of copulatory feet of seventh segment with their 
inner branches proximally clavate, the inner edge fairly straight, the outer strongly convex proximally, 
