494 PROCEEDINGS OF THE NATIONAL MUSt:UM. vol.44. 



KEY TO THE SPECIES OF LECTERiA — Continued. 

 4. Wing-markings present as a narrow seam along the cord; at fork of M,+2, R2+3, at 

 origin of R.i, at origin of the basal deflection of R^+j, and at the tips of R, and 

 Ro; cell first Mo pentagonal; basal deflection of Cu, before fork of M; baeal 



deflection of R,+5 long, longer than M, matto-grossx, new species (Brazil). 



Wing markings more extensive; a transverse band acroB.s the wnng in the neighbor- 

 hood of the cord; an intemipted band beginning at origin of Rs; tip of wing 

 dark; basal deflection of Cu, beyond fork of M; baeal deflection of R4+5 short; 

 arcuated, less than M, armillaris Fabricius ' (Costa Rica-Brazil). 



LECTERIA OBLITERATA, new species. 



Small, slender; basal antennal segments yellow; flagellum blaek; 

 general color of the bod}' dull black; legs brown; wings dark-col- 

 ored, gray. 



Male. — Length, 14.4 mm; wing, 11 mm. Head: Rostrum and 

 palpi dark brown; antennae, basal segments elongate-cylindrical, 

 stout, second rounded; flagellum, segments rapidly becoming smaller 

 toward the tip; basal segments light yellow; flagellar segments 

 abruptly dark, black. Front dark brown, shiny; vertex black, 

 polUnose on the sides; one or two hairs on the sides of the vertex 

 beliind the eyes, occiput \vdth a brown bloom; genae more yellowish. 



Thorax: pronotum, scutum and scutellum visible from above, 

 dull brownish-black. Mesonotum, prsescutum with the pseudo- 

 sutural fovea .shallow, but prominent, shiny black; prsescutum, 

 extreme cephalic margin with a yellowish bloom which is continued 

 backward on the sides of the sclerite; dorsum of the scleritc velvcly- 

 black at the anterior prominence; dull black back to the suture; 

 scutum, scutellum, and post-notum black, rather dusted with light 

 gray. Pleurae light gray; prothoracic pleurae som(!what darker, 

 blackish; an indistinct brown stripe across the pleuraB from the 

 fore-coxa to the base of the halteres. Ilalteres short, stem pale, 

 knob brown. Legs: coxae and trochanters light brownish-yellow; 

 femora dark brown, more yellow basally; tibiae and tarsi dark 

 brown. Wings dull brownish-gray; cells C and Sc yellow; veins 

 So and R yellow; remaining veins dark brown. Venation (see fig. 41). 



Abdomen very elongate; tergum brownish; segments dull yel- 

 low at the base and tip, remainder dark grayish-broAvn ; basal ster- 

 nites yellow, apical ones concolorous with the tergites. 



Habitat.— Jloloiype.—yi&h, Tukeit, British Guiana, July 21, 1911 

 (Lutz, coll.). Paratype. — Male, Kaicteur Falls, British Guiana, 

 Aug. 10, 1911 (Lutz, coll.). 



Types. — In American Museum of Natural History. 



1 Syet. AjiU., ISOJ, p. 20 (as Tipuia); Wiedemann, Aus3. Zweill. Ins., ISK, vol. 1. p. 13 (as Limnobia). 



