1912] New Neotropical Tipuline 349 
Allotype. ?, with the type. 
Types in Am. Mus. of Nat. Hist., New York. 
I know of no species of Tzipula that even approaches this 
remarkable fly. No form in the American fauna has a spur 
on the wing. 
Tipula guato, sp. n. 
Color light yellow; flagellum of antennze bi-colored; wing subhyaline. 
o Length, about 12 mm.; wing, 11.5 mm. 
Fore leg, femur, 7.6 mm. - tibia, 9 mm. 
Head: Anterior sade of the front rather short; nasus not 
distinct, but with a long brush of hairs in its normal position; dull 
yellow, brightest on the sides. Palpi, light yellow, short. Antenne, 
basal segments yellow, second segment with a brush of hairs on the 
inner face; flagellum, segments swollen on the ends, narrowed medially; 
the basal knot blackish, and with a few prominent hairs; the entire 
segment clothed with dense pale hairs; basal segments of flagellum with 
apices yellow, this color gradually passing into the dark brown of the 
terminal segments. Front, vertex and occiput dull brownish-yellow. 
Thorax: Mesonotum, prescutum dull yellow without apparent 
‘stripes; scutum, scutellum and post-notum similar but more or less 
‘suffused with brown. Pleurz dull yellow, sparsely greyish pollinose. 
Halteres, stem yellow, knob brown. Legs: coxz and trochanters 
light yellow gradually passing into the brown of the tarsi (only fore legs 
remain). Wings: Subhyaline, stigma oval, pale brown; cell C and 
pices of cells R, and R; tinged with yellow; veins brown, Se more 
yellowish. Venation: (see Fig. e); Sc long ending fat beyond Rs; Rs 
short, about as long as Mj4 between cross-veins r-m and m; Roy3 ina 
dine with Rs; Rez oblique; cell Ist Mz; rather elongated; petiole of cell 
M, short; cross-vein m-cu distinct. 
Abdomen: Tergum light brown, almost uniform; 7th and 8th 
black; hypopygium yellow; sternites light brown; 7th and base of 8th 
black. Hypopygium: (see Fig. p); 7th sternite broad, its caudal margin 
almost straight; 7th tergite almost convex; 8th sternite (8s) broad at 
the base with a very obtuse tooth on its dorsal margin; produced 
behind into a blunt point which is broadly and obtusely notched at the 
tip; Sth tergite (St.) moderately broad, about one-third as wide as the 
7th, rather widened at the ends, but the caudal margin almost straight; 
9th sternite (9s) subquadrate, large, its dorsal margin straight; its 
caudal margin truncated; ventral margin with an obtuse ventral- 
projecting tooth; the inner margin is bent inward and has a dorsally- 
directed tooth; this inward projection of the 9th sternite fills a consid- 
erable portion of the genital chamber between the 9th sternites and just 
dorsad of the 8th sternite. Along the median line it is deeply notched, 
and the whole external face is densely covered with delicate, silvery- 
white, appressed hairs. 9th tergite (9t.) rather short with an obtuse 
median notch, the adjacent teeth broad, obtuse, projecting downward, 
densely covered with short, stout hairs, the extreme base of each tooth, 
