ART. 21 ACALYPTRATE FLIES MALLOCH 7 



acrostichal bristles. Inner cross vein about three-sevenths from base 

 of discal cell; penultimate section of fourth vein half as long as 

 ultimate. 



Length, 3 mm. 



Type and 5 faratypes. — Higuito, San Mateo, Costa Rica (P. 

 Schild). Cat. No. 28442, U.S.N.M. 



CAMPTOPROSOPELLA FLAVIPALPIS, new species 



Female. — Similar to the preceding species in color, but the ocellar 

 spot is very small and much paler, the palpi are entirely yellow, 

 and the abdomen lacks the large black lateral dorsal spots. 



Frons not half of the head width; ocellar bristles very fine and 

 close together at bases. Prescutellar pair of acrostichals present. 

 Inner cross vein at two-fifths from base of discal cell; penultimate 

 section of fourth vein fully four-fifths as long as ultimate section. 



Length, 3 mm. 



Type and 5 paratypes. — San Mateo, Costa Rica (P. Schild). 

 Cat. No. 28441, U.S.N.M. 



The only species with unmarked wings and yellow palpi so far 

 recorded. 



SETULINA, new genus 



Generic characters. — Similar to Minettia^ but the base of stem vein 

 (radius) is furnished with a series of setulae on its hind side above 

 proximad of humeral vein. 



Genotype. — Setulina prima.^ new species. 



SETULINA PRIMA, new species 



Female. — Tawny yellow, thorax and abdomen shining. Frons 

 opaque, shining only on orbits and triangle; ocellar spot black; 

 sides of face white dusted. Abdomen with black apices to tergites, 

 the dark color carried angularly forward on median line, especially 

 on tergites 3 and 4. Legs yellow. Wings yellowish hyaline, a deep 

 brown mark along costa from apex of auxiliary vein which extends 

 over second vein to beyond outer cross vein at which point it ex- 

 pands, covering tip of Aving from costa to a little over fourth vein, 

 a quite conspicuous dark brown cloud over each cross vein, the one 

 on inner connecting with the costal streak. Halteres dusky yellow. 



Frons less than one third of the head width, surface hairs weak, 

 orbital bristles strong, recurved; ocellar bristles of moderate length, 

 shorter than the cruciate postverticals, the latter far removed from 

 posterior ocelli; arista rather long haired; cheek very narrow; 

 upi:)er postocular setulae very strong. Thorax with two pairs of 

 strong, and one pair of weak, anterior, dorsocentral bristles, a pair 

 of long prescutellar acrostichals, intra-alar strong, one bristle behind 



