22 COSTA EICAN DIPTERA 



Leptocera (Limosina) marginalis new species 



Male. — Black, slightly shining. Face and cheeks brownish, obscured by 

 grayish pollen; frons black, opaque except on the stripes on which the 

 bristles are; antennae with third joint yellowish brown. Mesonotum and 

 scutellum with slight traces of yellowish gray pollen; pleura subopaque, 

 brown-black, sutures yellowish. Legs fulvous, fore tarsi, hind femora 

 and tibiae brownish. Wings slightly browned, veins thick and brown 

 Halteres yellow. 



Frons convex, distinctly over half the width of head ; the pair of orbital 

 bristles strong and of equal size; several weak hairs on orbits; central bris- 

 tles strong and distinctly increasing in length anteriorly; face keeled, almost 

 jierpendicular in profile; labrum distinct; antennae of moderate size, stand- 

 ing well clear of apex; arista about I5 times as wide as frons, pubescent; 

 cheek broad, slightly less than half as high as eye; buccal bristle strong, 

 a weaker upturned bristle posterior to it, the marginal hairs not very nu- 

 merous, but setulose. Post-humeral bristle strong, incurved; 3 distinct 

 pairs of dorso-centrals present; scutellum with 4 strong and 4 weak mar- 

 ginal bristles and several setulose hairs on lateral margins of disk. Ab- 

 domen much shorter than thorax, cylindrical; hypopygium not projecting, 

 its surface with short hairs, last abdominal segment with several strong 

 bristles. Legs normal in shape; mid tibia with one bristle at middle on 

 ventral surface and another much stronger at apex, the dorsal bristles 

 strong; mid trochanter with a strong bristle. Wing with bristles on costa 

 to end of first vein; second costal division 1^ times as long as third; costa 

 reaching to end of third vein; basal section of third vein subequal with 

 penultimate section of fourth; outer cross vein at distinctly before end of 

 second vein, and about one-third the length of the section of fourth vein 

 before it; last section of third vein distinctly but not greatly bent forward, 

 ending well in front of wing tip; last section of fourth vein distinct to mar- 

 gin of wing though not so thick as the outer veins; fifth vein carried beyond 

 outer cross vein for a short distance. Length, 3 mm. 



Tho female is identical with the male except in the sexual organs. 



Holohjpe.— d', Cartago. November 21, 1909, swept over mud. 

 Type No. 6034. 



Paratypes. — 1 male, December 12, 1909, swept over mudd}' 

 road, and 1 female same date as type from same locality. 



Leptocera (Limosina) f uscinervis ^NLilIoch 



1912. LimoHina f uscinervis Malloch, Smiths. Aliss. Coll. lix, No. 17, 6. 



This species is represented amongst the ( 'osta Rican material 

 by specimens from the following localities: Cartago, October 27, 

 1909, 1 specimen; Cartago, February 19, 1910, 1 specimen; Cachi, 

 March 10, 1910, 6 specimens taken at stagnant pool near bank of 

 l^io Reventazon; Alajuela, September 15, 1909, swept at 3100 feet 



