"26 SOUTH AMERICAN TIPULIDAE 



Frontal prolongation of the head yellowish brown, rather elongated, a nar- 

 row dark brown line along the side; palpi short, dark bro\\Tiish 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 Ught 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 Une and 

 a transverse row of dark brown dots. Mesonotal praescutum light brownish 

 gray; a very narrow dark brown median line broadened behind; on either 

 side of this Une, a broader paler grayish brown line, 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 fight 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 Une; 

 scuteUum and i^ostnotum light gray with a deUcate brown middle Une 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 browii; 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 Ri, 

 basal haK of 1st M2 and parts of M3 and Cui] a hyaUne dash in ceU R along 

 vein R, this including the proximal end of ceU 1st Ri;si whitish blotch at about 

 three-fourths of the length of cell M; brown clouds as follows: stigmal blotch, 

 this being continued down the cord to the ceU 1st Mo] 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 duU yellow with a distinct interrupted dorsal brown 

 Une; 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 furrow 

 extending the length of the sclerite; caudal margin with a sharp chitinized 

 tooth on either side of the broad furrow described above. The ninth plourite 

 distinct, situated on the caudal face of the ninth sternitc; a cylindrical fleshy 

 lobe (6) with long hairs on the vcntro-ce])halic i>()rtion of the jileurite; a large 



