March, i9-'o.] ALEXANDER: XeOTROPICAL CrANE-FlIES. 5 



Holotype, J. Quebrada Richa, a branch of the Rio Tapaliza, a 

 branch of the Rio Puero, altitude 1.300 feet, July 24, 1918 fAxel 

 Olsson). 



This small species is closest to Rhipidia costalis W'illiston of Cen- 

 tral America and the Lesser Antilles. In order to supplement Wil- 

 liston's brief description, which applies equally well to more than 

 one species in the Neotropical fauna, ^Mr. W. D. Lang, of the British 

 Museum of Natural History, has very kindly sent me an enlarged 

 accurate drawing of the wing of the type specimen of R. costalis. 

 This figure agrees in all the essentials with the fly determined by the 

 writer as costalis in an earlier paper (JouRX. N. Y. Ext. Soc, Vol. 

 22, pi. 3, fig. 2; 1914), the dark markings along the costal margin 

 being considerably larger than the pale interspaces, the radial sector 

 very long, the basal deflection of R^.. comparatively short, basal de- 

 flection of C»i just beyond the fork of .1/ and other characters. In 

 Mr. Lang's figures, cell first M„ is shorter and broader than in the 

 specimen above mentioned. R. costaloidcs is readily told by the 

 reduced costal pattern and the venational details. 



Genus Teucholabis Osten Sacken. 

 Teucholabis mendax new species. 



General coloration reddish, the pn-escutum with three broad black stripes ; 

 head shining black; pleura with large black blotches; legs yellow throughout; 

 wings subhyaline, the apex and a broad seam along the cord slightly brownish. 



Male. — Length, 7 mm. ; wing, 6.4 mm. 



Rostrum pale brown, the palpi dark brown. Antennre dark brown, the 

 basal segments only a little paler. Head intense shiny black. 



Pronotum shiny dark brown, the scutellum more reddish. Mesonotal prae- 

 scutum reddish yellow with three intense black stripes that are very extensive, 

 the interspaces restricted; median stripe ending before the suture; lateral 

 stripes very broad, nearly circular in outline, continued caudad onto the scutal 

 lobes ; remainder of the mesonotum reddish, the postnotum with a distinct 

 median and less distinct lateral stripes on the caudal half. Pleura orange- 

 yellow with large jet black areas, smallest on the propleura ; two large blotches 

 on the mesopleura, the largest on the mesepisternum, extending from the ster- 

 num to the dorsopleural membranes ; a smaller oval area immediately cephalad 

 of the halteres. Halteres small, reddish, the stems a little darker. Legs dull 

 yellow throughout, the femora somewhat thickened. Wings subhyaline with 

 the apex and a broad diffuse seam along the cord very indistinctly darker ; 

 stigma dark brown ; veins dark brown, the basal and costal regions more yel- 

 lowish. Venation : Sc rather long, extending to about midkngth of the sector ; 



