20 COSTA RICAN DIPTERA 



lowish, slightly obscured by brown. The cheeks are also rather 

 higher than in the foregoing and the wing veins are yellowish. 

 The very conspicuous hair on the lateral margins of the last ab- 

 dominal segment in rectangidaris is not noticeable in this species. 

 In all other respects the species are practically identical. 



Holotype. — Juan Vinas, May 3, 1910, near brook, forest edge, 

 2500 feet altitude. Type No. 6031. 



Paratypes. — 3 specimens Juan Vinas, May 1-2, 1910, forest 

 brook, 2500 feet altitude; 1 specimen, Alajuela, September 9, 1909, 

 swept at 3100 feet altitude, and one specimen same locality on 

 September 15, 1909; 1 specimen, Filadelfia, January 18, 1910; 1 

 specimen, Cartago, February 19, 1910. 



Leptocera (Limosina) bisecta new species , 



.MaZe.— Similar to the foregoing in color except that the halteres.are 

 yellow. 



Frons opaque, grayish poUinose between the stripes on which the bristles 

 are situated; lower orbital bristle slightly the weaker; central bristles 3 or 

 4 in number, decreasing slightly in size anteriorly; antennae divergent, 

 but standing well clear of the eyes, of moderate size, third joint larger than 

 second, pilose, yellowish on interior surface; arista tapering, pubescent, 

 slightly more than H times as long as width of frons; face concave, covered 

 with grayish pollen; cheek less than one-third the height of eye, vibrissa 

 strong, marginal hairs weak, buccal bristle present, pointing upward. Meso- 

 notum with 2 pairs of dorso-centrals, the anterior pair weak, situated very 

 widely apart at about midway on disk; post-humeral bristle absent; ster- 

 nopleural bristle of moderate length; scutellum with 4 bristles. Abdomen 

 cylindrical, shorter than thorax; hypopygium glossy black, very large, with 

 2 projecting ventral appendages, which are thorn-like in appearance, sur- 

 face covered with short hairs. Fore tarsi slightly broadened; mid tibial 

 bristles of moderate strength, no ventral bristles present; basal joint of 

 hind tarsus about half as long as second. Wing with second costal division 

 about equal to third in female, slightly shorter in male; costa carried very 

 little beyond end of third vein; penultimate sections of veins 3 and 4 sub- 

 equal; last section of third vein straight, ending slightly before wing tip; 

 outer cross vein at about twice its own length from inner and slightly before 

 end of second vein; veins 4 and 5 indistinct from very little beyond outer 

 cross vein; costa with weak hairs. Length, 1.75 to 2 mm. 



The female agrees except in the sexual organs and as pointed out in 

 description. Three of the specimens in the series have the buccal bristle 

 absent, but I believe from their condition that it has been rubbed off. 



Holotype.— d", Cartago, December 12, 1909, sweeping over 

 muddy road. Type No. 6032. 



