14 COSTA RICAN DIPTERA 



Leptocera (Limosina) monticola new species (Fig. 10.) 



Male. — Black-brown, shining. Head yellow; frons brown, sides of fron- 

 tal triangle and orbits whitish poUinose; face glossy; cheeks opaque. Mes- 

 onotiim shining black-brown with traces of three grayish vittae; pleura 

 opaque, black-brown, yellowish along sutures; scutellum shining black- 

 brown. Abdomen black, subshining; hypopygium gloss}' brown. Legs 

 yellow, .femora blackened, tibiae with brown rings on mid and hind pairs 

 as in vittata, the ring on fore pair almost indistinguishable; tarsi with apical 

 joint browned. Wings faintly marked as in figure 10; veins brown. Halteres 

 brqwn. 



Two orbital bristles present, the lower one projecting over eye; central 

 setulae indistinguishable on frons; antennae divergent, but standing well 

 clear of the eyes; arista bare, hair-like, in length about 1§ times the breadth 

 of frons; cheek at highest part about equal to height of eye, the marginal 

 bristles weak; vibrissa large, incurved, Mesonotum with 2 pairs of dorso- 

 central macrochaetae, the anterior pair weak; discal setulae weak, arranged 

 in 4 rows of rather irregular formation between dorso-centrals; scutellum 

 bare on disk, 4 marginal bristles present, the anterior ]>air the weaker. 

 Hypopygium large and incurved the central processes claw-like and covered 

 with numerous stubby bristles, apex of hypopygium with short stiff hairs. 

 Legs normal; hind tarsus with basal joint about one-half as long as the less 

 thickened second joint; both together slightly less than equal to the length 

 of other joints together. Wing venation as in figure 10; fourth vein 

 traceable to half way to wing margin. Length, .75 mm. 



Holotijpe.— Juan Vinas, May 2, 1910, forest brook, 2300 feet 

 altitude. Type No. 6023. 



Leptocera (Limosina) varicosta new species (Fig. 9.) 



Male. — Glossy black. Frontal orbits sometimes with a whitish sheen; 

 antennae clear yellow. Mesonotum vmstriped. Abdomen opaque brown, 

 yellowish on venter; hypopygium glossy brown, Legs black, apices of fore 

 coxae, trochanters, bases of tibiae and tarsi yellowish. Wings whitish, 

 veins yellowish brown, the second costal division glossy black. Halteres 

 yellow, knob brown. 



Head short, viewed from above at least twice as broad as long; frons raised 

 in center, the orbits differentiated from central stripe; bristles very weak; 

 2 orbital bristles present, the lower one not projecting over eye; central 

 stripe bare, antennae small, divergent but not lying close to eyes, third 

 joint rounded; arista pubescent, in length about equal to twice the width 

 of frons; cheek about as high as eye; marginal bristles weak, becoming 

 stronger towards front, vibrissa weak but distinguishable. Mesonotum 

 arched; 2 pairs of very weak dorso-centrals present, which are not easily dis- 

 tinguished from the numerous discal hairs; scutellum convex, rounded in 

 outline, four marginal bristles present, the anterior pair weakest. Hj-^popyg- 

 ium covered with short hairs. Legs normal; mid tibial bristles weak. 



