^4^ BRITISH GUIANA TIPtJLIDAE 



Pleurites with the chitinized appendage curved, sickle-shaped, sharp 



at the tip 5 



5. Both the dorsal and ventral gonapophyses distinct; penis guard not 

 prominent. [Sc long ending opposite or slightly beyond the ori- 

 gin of Ri; pleura distinctly striped.] (British Guiana) 



scimitar sp. n. 

 The ventral gonapophyse an oval lobe with numerous slender hairs; 

 penis guard long, extending far beyond the tips of the pleurites. 

 [Sj ending just before the origin of Ks; pleural stripes not clear- 

 cut.] (Florida; Haiti; British Guiana) puer Alexander 



1 have not included piie'la Williston because the male is not known to 

 me; it is figured (Trans. Ent. Soc. Lond., 1896, pi. 10, fig. 60) as having a 

 conspicuous recurved ventral appendage. 



Gonomyia (Leiponeura) alexanderi Johnson 



1912. Eliplera alexanderi Johnson, Psyche, xix, 3, fig. 6. 



A female specimen, taken in the swamps, December 31, 1912. 

 One female at light, also at Bartica, February 4, 1913. One female 

 at light,' Mallali, March 11, 1913. 

 Gonomyia (Leiponeura) pleuralis Williston 



1896. Atarba pleuralis Williston, Trans. Ent. Soc. Lond., 1896, 289, pi. 

 10, fig. 61. 



About four hundred specimens of which some fifty are males. 

 This large series was taken at light at Bartica from December 9, 

 1912 to February 26, 1913 and at Mallali on March 14, 1913. 



Gonomyia (Leiponeura) inermis sp. n. 



Rather large species (wing over 3.5 mm.); subcosta short; pleura indis- 

 tinctly striped; pleural pieces of the male hypopygium without chitinized 

 appendages. 



Male.— Length, 3.9 to 4.1 mm. ; wing, 3.7 to 3.9 mm. 



Female. ^Length, 4 mm. ; wing, 3.8 mm. 



Rostrum above bright orange, the palpi dark brown, .\nteiinae brownish 

 black. Head grayish. 



Thoracic dorsum grayish plumbeous, the scutellum, only, pale yellow- 

 ish white. Pleura pale silvery white, a broad indistinct plumbeous stripe 

 begins on the side of the neck and ends beneath the wing-root; sternites 

 plumbeous. Halteres dark brown, the knob, only, a little paler. Legs, 

 coxae and trochanters dull brownish yellow, remainder of the legs brownish 

 black. Wings subhyaline without a stigmal spot. Venation: (Plate iv, 

 fig. 5) Sc ends far before the origin of lis, this space about equal to the cross- 

 vein m. 



Abdominal tergites brown, sternites a little paler, hypopygium dull yel- 

 low. Hypopygium with the pleurites long, clothed rather densely with long 

 hairs, at the tip narrowed into an arm which is truncated at the apex and 



