ART. 21 ACALYPTRATE FLIES MALLOCH 21 



Subgenus Melanomyza Malloch 



PSEUDOGRIPHONEURA (MELANOMYZA) LATERALIS, new species 



Male and female. — Shining black, antennae yellow, legs and 

 halteres stramineous; anterior half of each orbit opaque velvety 

 black, remainder of frons glossy black; pleura opaque; scutellum 

 shining. Wings slightly grayish, outer cross vein very faintly 

 clouded. 



Anterior orbital bristle about half as large as posterior one; 

 ©cellars microscopic; antennae stout, third segment tapered a little 

 apically, barely twice as long as its basal width; arista plumose; 

 face convex; cheeks linear. Thorax with tM'O pairs of strong 

 dorso-centrals; prescutellar acrostichals absent. Inner cross vein 

 distinctly beyond middle of discal cell; outer cross vein at more than 

 its own length from apex of fifth vein; last section of fourth vein 

 nearl}^ four times as long as preceding section. 



Length, 3 mm. 



Type. — Male, allotype, and one male and one female paratype, 

 Higuito, San Mateo, Costa Rica (P. Schild). Cat. No. 28455, 

 U.S.N.M. 



The only species known to me which has the sides instead of the 

 center of frons velvety black. 



PSEUDOGRIPHONEURA (MELANOMYZA) ALIENA, new species 



Male. — Head black, frons with interfrontalia opaque velvety from 

 anterior ocellus to antennae, the orbits and ocellar region glossy; 

 face yellow; antennae yellow, third segment back except at base; 

 arista fuscous; palpi yellow. Thorax black, shining, greasy in type; 

 pleura opa({ue, black, upper parts of mesopleura and sternopleura 

 whitish pruinescent. Abdomen black. Legs including coxae 

 stramineous, fore femora with a faint dark mark near apices on 

 posterior side. Wings greyish, a slight dark cloud near apex of 

 second vein and disk of wings slightly brownish. Halteres dusky 

 yellow. 



Ocellar and postvertical bristles minute; orbital bristles weak, 

 the front pair especially so; antennae fully as long as height of 

 head ; basal segment as long as second, third four times as long as 

 broad, not very slender; arista long haired above, short haired 

 below; face slightly receding below; cheek linear. Only one pair 

 of distinct dorsocentrals present, and no prescutellar acrostichals; 

 pleural bristles weak. Abdomen long and slender. Legs slender, 

 longer than usual, the preapical tibial bristle lacking. Wings about 

 three times as long as wide, inner cross vein at middle of discal 

 cell, last section of fourth vein nearly three times as long as preced- 

 ing section. 



Length, 2.75 mm. 



