60 COSTA RICAN DIPTERA 



Table of Species 



1. All tibiae black; fore tarsi white; cheeks very broad centralis 



Fore tibiae alone black 2 



2. Wings clouded on disk and at apex f ascipennis 



Wings hj-aline or evenly tinged 3 



3. Cheeks at least one-half as high as eyes slmllis 



Cheeks at most one-third as high as eyes 4 



4. Mesonotum pohshed laevis 



Mesonotum obscurely shining; wings hj^aline glaphyropus 



Mesonotum entirely opaque, granulose; wings tinged with brown; large 



species atra 



Ochtheroidea centralis new species PI. Ill, fig. 13, 14, 



Black; middle and hind tarsi tawny; fore tarsi, except three apical joints, 

 and halteres, white. Wings hyaline with brown veins. Shining, with mesono- 

 tum faintly brown dusted. 



Face strongly, subconically convex below. Cheeks one-fourth as high as 

 eyes. Length. — 2.5 mm. 



Type. — d' ; Turrucarcs, Costa Rica, December 20, 1909, 

 (sweeping over mud near small stream north of Rio Siquiares), 

 [Type No. 6136]. Paratijpes. — 2 cf, 2 9 ; topotypical. 



Also represented by a homotypical series of three specimens,^ 

 from Bonnefil Farm, Rio Siiriibres, October 20; Alajuela, Sep- 

 tember 15; Filadelfia, (muddy beach of Rio Tempisque), Jan- 

 uary 18. 

 Ochtheroidea fascipennis new species 



On account of this species occurring in Colombia I include it 

 here, as it is likelj' to be found within our limits. 



Similar to centralis, but more slender. Fore tarsi with only basal joint black, 

 and the middle and hind tibiae yellow. The wings have a discal cloud over 

 posterior cross vein and the apex including tip of marginal cell also infuscate. 

 Length. — 2 mm. 



Type. — d^ ; Aracataca, Colombia, February 1912, (Ujhelyi), 

 [Hungarian National Museum]. Paratypes. — 2 cf , 1 9 ; topo- 

 typical. 



Ochtheroidea atra ^^'illiston 

 1896. Ochtheroidea atra Williston, Trans. Ent. Soc. London, 1896, 401. 



This species was described from St. Vincent, West Indies, and 

 I have a specimen from Panama, so it is likeh' to occur in Costa 

 Rica. 



