26 SOUTH AMERICAN TIPULIDAE 
Frontal prolongation of the head yellowish brown, rather elongated, a nar- 
row dark brown hne along the side; palpi short, dark brownish black. An- 
tennae with the first segment elongate cyhndrical, a little narrowed toward 
the base; the second segment small, without a distinct tooth as in the other 
members of the monilifera group; the segments 4 to the end of the organ with a 
basal swelling which occupies about one-quarter of the segment; the segment 
beyond the basal swelling slightly constricted (see plate IV, fig. 6) ; antennae 
with the three basal segments light yellow, remaining segments dark brownish 
black on the basal enlargement, the remainder of the segment yellowish 
brown. Front with a distinct tubercle, scarcely if at all notched in front; 
vertex light brown passing into gray on the occiput; median portion of the 
vertex darker brown, paler, more yellowish adjoining the eyes. 
Pronotum light grayish brown with a darker brown longitudinal line and 
a transverse row of dark brown dots. Mesonotal praescutum hght brownish 
gray; a very narrow dark brown median line broadened behind; on either 
side of this Une, a broader paler grayish brown hne, darkest in front, behind 
becoming confluent with the narrow median vitta. Lateral stripes short and 
rather indistinct; the interspaces between the thoracic stripes are provided 
with rather numerous setae, the base of each of which is surrounded by a 
dark brown spot producing the spotted appearance characteristic of this 
group of species; scutum light gray with two small brownish spots, the smallest 
of which lies in the outer anterior angle of the sclerite, the larger one behind; 
a few brown setigerous markings on either side of the dark brown middle hne; 
scutellum and postnotum hght gray with a delicate brown middle line and a few 
sparse brown setigerous punctures. Pleura light brown, heavily gray pruinose. 
Halteres light brown, rather short. Legs with the coxae light yellowish gray, 
the outer face provided with numerous setiferous punctures; trochanters 
yellow; femora dull yellow, the tip broadly dark brown; tibiae light yellow, 
tipped with dark brown; tarsi dark brown. Wings with the costal cell rich 
yellow, remainder of the membrane light brownish gray, a broad white 
cross-band extending from beyond the stigma almost across the wing outside 
the cord, occupying the end of cell 2nd Ri, base of R2, basal portion of R3 and R^, 
basal haK of 1st M2 and parts of M3 and Cih; a hyaline dash in cell R along 
vein R, this including the proximal end of cell 1st Ri] a. whitish blotch at about 
three-fourths of the length of cell M; brown clouds as follows: stigmal blotch, 
this being continued down the coi'd to the cell 1st M^; narrow seams along Cu 
and 2nd A, at the end of Sc, at the origin of Rs and on vein R midway between 
the arculus and the base of Rs. Venation as in plate 3, fig. 2. 
Abdominal tergites dull yellow with a distinct interrupted dorsal brown 
line; lateral edges of the segments broadly brown, the terminal segments 
darker, more uniformly brown. Hypopygium (see plate V, fig. 1) with the 
eighth tergite rather broad, straight across the caudal margin. Ninth tergite 
(plate V, fig. 3) elongate, subquadrate, with a deep and broad median fm-row 
extending the length of the sclerite; caudal margin with a sharp chitinized 
tooth on either side of the broad furrow described above. The ninth pleurite 
distinct, situated on the caudal face of the ninth sternite; a cyhndrical fleshy 
lobe (b) with long hairs on the ventro-cephalic portion of the pleurite; a large 
