340 THE CANADIAN ENTOMOLOGIST. 



Furcomyia omissa, sp. n. 



Small; dark brown ; wings dark, stigma present ; Sc^ short, Sc.^ ap- 

 parently lacking. 



9.— Length, 3.7-4 mm.; wing, 4-4.2 mm. 



Ç . — Head : rostrum and palpi dark brownish black. Antennas 

 brownish black. Front, vertex and occiput brown. 



Thorax : mesonotum, prsescutum with a thick brownish pollen, be- 

 coming grayish on the sides of the sclerite ; a dark brown median stripe 

 beginning near the anterior end of the sclerite, becoming narrower and 

 finally obsolete before the suture ; scutum, scutellum and postnotum dark 

 brown. Pleurae dark brown, with a sparse gray bloom on the middle of 

 the thorax. Haltères dark brown ; remainder of femora, tibiae and tarsi 

 dark brown. Wings somewhat' suffused with darker ; a small oval brown 

 stigma. Venation : (See fig. o.) Sc short, ending far before the origin 

 of Rs, SCo not evident. Rs rather short, about one and one-half times 

 the length of the deflection of R4+5 ; cross-vein m present in the type, 

 absent in the paratype. 



Abdomen dark brown. 



Holotype.— Ç . Aguna, Guatemala, Cent. Am. (Dr. G. Eisen.) 



Paratype. — $ . Same as the type. 



Types in U. S. Nat. Mus. coll. (No. 15,139-) 



Furcomyia knabi sp. n. 



Like liberta O. S., but ventral lobe of ^ hypopygium produced 

 entrad in a long slender arm. 



^. — Length, 6.5-7 "^"^-i ^^"S» 8.8-9 ^ mm. 



Ç.— Length, 7 mm.; wing, 9 mm. 



Head : rostrum and palpi dark brownish black ; antennte black. 

 Front, vertex and occiput clear gray. 



Thorax : dorsum of the mesonotal praescutum suffused with brown, 

 general colour brownish gray, much browner than the clear gray of the 

 head ; stripes on thoracic dorsum ill-defined ; scutum dull gray, the 

 scutellum very light gray ; postnotum gray. Pleurse grayish. Haltères 

 yellow, knob brown. Legs : coxae and trochanters brown ; femora, tibiae 

 and tarsi dark brown. Wings almost as in liberta O. S., not pallid at 

 base ; a faint stigma at the tip of R^. Venation : (See fig. m.) 



Abdomen gray. Hypopygium: (See fig. w.) Dorsal aspect, 9th 

 sternite very convex, ending in a small knob deeply bifid ; pleurae long, 

 cylindrical, bearing two apical lobes; the dorsal lobe slender, 

 chitinized, ending in' an acute point; ventral lobe yellow, produced entad 



