1912} New Neotropical Tipuline 345 
tergite distinct, about as wide as the 7th, its caudal margin straight, its 
lateral corners evenly rounded; 7th sternite rather broad, broader then 
the sixth sternite; Sth sternite very large, longer than the three pre- 
ceding segments combined and projecting caudad beyond the remaining 
appendages; its ventral face is evenly rounded, broad at the base, 
narrowing apically, at its tip turned abruptly dorsad and ending in two 
blunt teeth, these teeth bifid with the caudal denticulum rather the 
longer. Above the origin of the Sth sternite arises the 9th sternite: 
broad basally, rapidly narrowed toward the tip into a chitinous, spoon- 
like appendage, convex on its outer face, concave on its inner. 9th 
tergite with the caudal margin rather deeply incised medially, the 
adjacent lobes brown, chitinized, and bent ventrad at the tip. Two 
distinct sets of apical appendages arising from the genital chamber, 
which may, or may not, be connected with one another nearer their 
bases; first, a pair of dorsal-lieing appendages which are bifid with the 
ventral tooth greatly prolonged, stylet-like (see Fig. k,). Beneath 
these are two large complex appendages (see Fig. k) which may be 
described as being three-branched, the ventral branch is - strongly 
chitinized and expanded, six-toothed, of which the most dorsad is the 
largest; the dorso proximal branch (a) is flattened, its margin chitinized 
and somewhat reflexed, bearing a spine near its outer edge at the tip; 
the dorso-distal branch (b) is slender, more fleshy and bears scattered 
hairs at its apex. Between the ventral organs, just ventrad of the 
dorsal pair is a large, pale fleshy organ. 
Q Antennz mostly yellowish excepting the apical segments which 
are brown. On the cephalic margin of the mesonotal praescutum is a 
dark brown spot on either side of the usual broad median stripe which is 
here not indicated; a large brown spot on the sides of the sclerite about 
at the anterior end of the usual lateral stripe. Ovipositior (see Fig. r) 
with the valves very short, blunt, evenly rounded on their lateral 
margin. 
A paratype male shows the fore portion of a lateral stripe on the 
preescutum. 
Holotype, o’, Antigua, Guatemala. Sept., 1902 (Dr. G. Eisen). 
Allotype, 2, with the type. 
Paratype, o’, Aguna, Guatemala. (Dr. G. Eisen). (Received at 
U.S. National Museum, Jan. 6, 1903). 
Types in U. S. Nat. Mus. Coll. (No. 15,072). 
Paratype in author’s collection. 
Pachyrhina macrosterna, and the following species, trinidad- 
ensis, are closest allied to circumscripta Lw, ferruginea Fabr. 
and elegantula Will., in the respect that the thoracic stripes are 
not jet-black. The other nine Neotropical species are all 
black-striped species. These two species form a distinct group, 
(macrosterna group), differing from the species named above in 
their petiolate cell M: and powerful hypopygium. The petiolate 
cell M, suggests collaris Say of the Northeastern United States, 
a very different insect. 
