234 BRITISH GUIANA TIPULIDAE 



Teucholabis stygica sp. n. 



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

 cord. 



Female. — Length, 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 

 Cui', a faint brown seam along the outer end of cell 1st Mo. Venation: see 

 pi. Ill, fig. 6. 



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



Habitat. — Bartica, 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, 7.8 mm.; abdomen, 6.1 mm.; wing, 5.9 mm. 



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-median portion of the praescutum and the cephalo-median portion of 

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

 ed blotch on the sides of the sclerite, obscure yellow; 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. 



Abdomen 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 tj^pes 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. 



