June-Sept., 1919.] ALEXANDER: NEOTROPICAL CRANE-FLIES. 151 



Male. — Frontal prolongation of the head moderately long, dull yellow, 

 more brownish laterally ; r.asus distinct. Antennae elongate, if bent back- 

 ward extending about to the base of the abdomen ; scape and the first segment 

 of the flagellum dull yellow, the remainder of the flagellum yellow with the 

 basal swelling black, the terminal segments more brownish throughout. Head 

 light gray or yellowish-gray with a narrow dark brown median line extending 

 from the frontal tubercle caudad, somewhat interrupted on the vertex. 



Mesonotal praescutum brownish-yellow, narrowly striped with darker 

 brown; a narrow median stripe, broadened behind and attaining the suture; 

 on either side of the middle stripe a pale brown line which evidently repre- 

 sents the outer border of the indistinct intermediate stripe, behind converging 

 and fusing with the middle stripe at the suture ; lateral stripes likewise repre- 

 sented only by a narrow dark margin ; thoracic interspaces with brown setiger- 

 ous punctures ; scutum gray with the median area narrowly dark brown, a 

 continuation of the median praescutal stripe ; a less distinct dark oblique mark 

 on the outer half of the scutal lobes; scutellum buff with a narrow median 

 brown line ; postnotum gray with an indistinct median dark brown line. 

 Pleura light gray with indistinct darker markings. Halteres dull brownish 

 yellow, the knobs dark brown. Legs with the coxae pale yellow, gray pruinose ; 

 trochanters dull yellow ; femora brownish-yellow, brightened at the base, the 

 apex broadly dark brown ; tibia brownish-yellow, the tip narrowly dark brown ; 

 tarsi yellowish-brown. Wings with a gray suffusion ; costal region brighter 

 yellowish ; wings with brown spots and clouds ; a brown spot at the arculus ; 

 a brown spot before midlength of the distance before the origin of the sector 

 and another at the origin of the sector, these two latter connected in cell R ; 

 stigma brown, continued down onto the cord ; cloudings in the apical cells, 

 along the deflection of Cu x , in cell M at about midlength and in the anal cell. 

 Venation : petiole of cell M 1 short, about as long as, or very little longer than, r. 



Abdomen brownish-yellow, segments seven and eight dark brown; tergites 

 with an indistinct narrow dark brown median line and a narrow dark brown 

 sublateral stripe ; extreme lateral margins of the sclerites grayish. Hypo- 

 pygium with the ninth tergite broadest basally, the sides sloping, the caudal 

 margin with a V-shaped notch ; lateral lobes broad, truncated at their apices ; 

 a broad dorso-median depression. Ninth pleurite small, complete, at its 

 proximo-ventral angles with a small hemispherical lobe that is covered with a 

 dense pale pubescence and a few long hairs; the outer pleural appendage 

 elongate, pale, with long hairs. Ninth sternite deeply incised on the mid- 

 line, but connected basally. Eighth sternite with a trifid appendage, the 

 median lobe of which is between two and three times the length of the short 

 lateral lobes and feebly carinate on the ventral face. 



Female. — Similar to the male, but the abdomen more elongated ; the 

 setigerous punctures on the praescutal interspaces more prominent, but the 

 lateral stripes of both praescutum and scutum obsolete. Wings semiatrophied, 

 slightly reduced in length and greatly in width, the pattern and venation dis- 

 torted. Abdominal tergites with a punctured rectangular area on either side 



