Sept.. 1913.] Alexander : Craneflies from Colombian Andes. 201 



Rostrum, palpi and antennae dark brown ; front, vertex and occiput dark- 

 brownish. 



Pronotal scutellum light yellow, showing off conspicuously against the 

 dark brown of the rest of the thorax. Mesonotal praescutum dark brown, lat- 

 eral edges of the sclerite paler, occupying the region before the pseudosutural 

 fovea ; remainder of the mesonotum dark brown. Pleurae dark plumbeous brown. 

 Halteres large, stem pale yellowish, knob brown. Legs, coxae and trochanters 

 dull yellqw, remainder of the legs brown. Wings with a faint brown suffusion, 

 stigmal region elongate, brown, veins brown. Venation (see PI. 2, fig. 5). 



Abdomen dark brown. Male hypopygium (see PI. 3, fig. 6). The 9th 

 tergite is a quadrate plate with its caudal margin broadly emarginate, the edge 

 with small teeth. Pleural pieces rather long, cylindrical, the inner ventral 

 angle produced into a lobe, the tip of the pleurites Ifearing long hairs ; two 

 apical appendages, both chitinized, the ventral one slender basally, more en- 

 larged and irregularly spatulate at the tip ; the dorsal appendage long, slender 

 and acutely pointed at the tip. The apophyses consist of a median quadrate 

 plate with its caudal margin straight or nearly so, produced into indistinct 

 points at the lateral angles ; on either side of this plate is a slender chitinized 

 rod directed caudad. 



Holotype, 6, Valle de las Papas, March 29, 1912. 



Allotype, $, with the type. 



Paratype, J', with the type. 



This is the first neotropical species of the subgenus to be described. 



Genus MOLOPHILUS Curtis. 

 II. Molophilus perseus new species. 



Male antennae short, thorax light yellowish brown, wings nearly hyaline, 

 veins light yellow, male hypopygium with the lower pleural lobe provided with 

 a strong chitinized appendage which is serrated on the caudal margin. 



Male, length, 4.8 mm. ; wing, 6.2 mm. 



Female, length, 5—5.3 mm. ; wing, 6.8-7.6 mm. 



Rostrum and palpi dark brown ; antennae with the basal segment yellow, 

 the remainder of the antennae dark brown, the flagellar segments elongated ; 

 head dark brown. 



Thoracic dorsum light yellowish brown without distinct stripes, extreme 

 margin of the praescutum pale yellowish white; scutum and scutellum brown, 

 postnotum dark brown. Pleurae dark brown. Halteres light yellow. Legs 

 light yellow, hind and middle tarsi darker. Wings subhyaline, veins light 

 yellow, especially bright along the costa and at the base of the wing. 



Abdomen dark brown. Male hypopygium (see PI. 3, figs. 4 and 5) with 

 the pleural pieces very short and broad, divided by a membranous notch into 

 two lobes; viewed from above with an oval lobe projecting caudad, this lobe 

 concave on its dorsal inner face and here provided with a strong chitinized 



