234 BRITISH GUIANA TIPULIDAE 



Teucholabis stygica sp. n. 



Black; wings hyaline with the tip infumed and a brown mark along the 

 cord. 



Female. — I^ength, 5.5 mm.; wing, 4.8 mm. 



Rostrum very long and slender, much longer than the head, dark brown- 

 ish black, the palpi black. Antennae black, the apical flagellar segments 

 broken. Head black. 



Thoracic dorsum deep shiny black, unmarked. Pleura black with a 

 very sparse grayish bloom in oblique lights, not shining, Halteres black, the 

 knobs pale, dull yellow. Legs black, the tibiae and tarsi brown. Wings 

 hyaline, the apex infumed with brown; a very large triangular blotch in the 

 region of the cord, broadest along costa, ending on the basal deflection of 

 Cu, ; a faipt brown seam along the outer end of cell Ixi M,. Venation: see 

 pi. Ill, fig. 6. 



Abdomen short, black, the valves of the ovipositor reddish chestnut. 



Habitat.— BsLTtica, February 8, 1913. 



Holotype, 9 , Bartica, February 8, 1913. 

 Teucholabis lugubrissp. n. 



Abdomen long and slender; head black; thorax black with scanty reddish 

 markings; wings hyaline with a small pale stigmal spot. 



Female. — Length, 7.8mm.; abdomen, 6.1 mm.; wing, 5.9mm. 



Rostrum rather short and stout, about as long as the head, this and the 

 palpi dark brownish black. Antennae dark brown. Head black. 



Pronotum black. Mesonotal praescutum black with a linear yellowish 

 stripe beginning near the pseudosutural fovea extending caudad toward the 

 suture but not attaining this; a conspicuous yellow blotch occupying the 

 caudo-mcdian portion of the praescutum and the cephalo-mcdian portion of 

 the scutum ; remainder to the scutum black ; scutellum black except a round- 

 ed blotch on the sides of the sclerite, obscure 5-elIow; postnotum black. 

 Pleura black with a silvery gray pubescence. Halteres black, the knob 

 large, obscure yellow. Legs with the fore coxae tipped with yellow, tro- 

 chanters brown, femora dark brown, most intense at the tip, tibiae and 

 tarsi brownish black. Wings hyaline or nearly so, veins brown, costa more 

 yellowish; a small rounded stigmal spot, pale brown and confined to the 

 vicinity of the crossvcinr. Venation: see pi. IV, fig. 3. 



-•Vbdomen very long and slender; tergites black, shiny, apices of segments 

 seven and eight reddish; sternites black, the valves of the ovipositor 

 chestnut brown. 



Habitat. — Bartica, January 4, 1913, in deep swamps. 



Holotype, 9 , Bartica, January 4, 1913. 



A key to the American species of this large and difficult genus is 

 appended. I have seen the types of over half the described forms 

 and specimens of many of the remaining species. The key should 

 always be supplemented by reference to the original descriptions 

 and figures. 



