50 COSTA RICAN DIPTERA 



Black, face medianly, antennae except upper margin of third, palpi, halteres 

 and legs, yellow. 



Opaque; abdomen, especially segments four to six polished. Frons and 

 mesonotum brown. Face and cheeks yellow or grayish; occiput and pleura 

 cinereous ; facial orbits, apical margin of third and apical spot on fifth abdom- 

 inal segment, silvery. 



Face vertical, lower part convex, scarcely prominent. Cheeks broad as 

 third antcnnal joint. Ai'ista with eight long hairs above. Abdominal seg- 

 ments four and five subequal in length. Wings hyaline, immaculate with 

 costal sections two and thi*ee subequal; penultimate section of vein four t^vice 

 as long as posterior cross vein. Length. — 1.25 mm. 



Type. — cf ; Bonnefil Farm, Rio Surubres, Costa Rica, October 

 20, 1909, (sweeping, 800 ft. alt.), [A. N. S. P. No. C122]. 



A topotypical female in poor condition shows three apical 

 silvery spots on segment four and one or three on five. There 

 may be similar spots on two and three. 



ILYTHEA 



1839. Haliday, An. Nat. Hist., iii, 408. 



This genus is well characterized by the broad face with its 

 nose-like carina, and the spotted, thick veined wings. The spe- 

 cies should not be confused with those of Scatella with similarly 

 marked wings. The genus is well represented in Costa Rica, 

 and the known species may be separated as follows: 



1. Second costal section more than three times as long as third; veins two and 



thi-ec parallel; femora black caniceps 



Second costal section not twice as long as third; veins two and three mark- 

 edly divergent ; femora mostly pale 2 



2. Wings with four brown .spots in first posterior cell, excluding costal cloud. 



calverti 

 First posterior cell with only three spots 3 



3. Wings -ndth two brown spots between apices of veins two and three. 



fenestralis 

 Wing with but one spot between these veins. 



Abdomen shining, jet black flavipes 



Abdomen subopaque, brownish obscura 



Ilythea caniceps new species 



Similar in structural and most color characters to spilota Curtis, which I 

 have seen from North America. It differs, however, in the frons being shorter 

 and broader in proportion; face narrower and longer and white or nearly sil- 

 very, wholly or nearly so, at least the orbits always silvery. This color is seen 

 when viewed from above, the upper face and tubercle remaining brownish. 

 The mesonotum and scutellum are more metallic; the abdomen shining with 



