ART. 21 ACALYPTEATE PLIES MALLOCH d 



tudinal veins, one before and the other beyond the outer cross vein. 

 The head is similar to that of Sapromyza and Minettia, the intra- 

 alar bristle is present as in the latter genus, and there is but one 

 sternopleural bristle present. The black costal set'ulae do not extend 

 to apex of third vein, and the preapical tibial bristle is present. 

 Genofi/pe. — Xenopterella obliqua^ new species. 



XENOPTERELLA OBLIQUA, new species 



Male and female. — Shining fulvous yellow, Ocellar spot and a 

 mark on middle of occiput fuscous; a mark between each antenna 

 and eye, and the palpi, black. A large mark across upper part of 

 sternopleura, and most of scutellum, fuscous. Abdomen more or less 

 infuscated. Legs yellow. Wings yellowish hyaline, with dark brown 

 and yellowish markings as in figure 1. 



Frons distinctly less than half of the head width, orbits hardly 

 differentiated, ocellar bristles longer than the postverticals and or- 

 bitals; arista distinctly pubescent; eye about as high as long; face 

 not convex. Thorax with three pairs of postsutural dorsocentrals 

 and one pair of distinct prescutellar acrostichals ; intradorsocentral 

 setulae in about six series; intra-alar rather weak; scutellum convex, 

 bristles subequal ; propleural bristle not distinguishable in any speci- 

 ments before me. Fore femur without anteroventral comb; hind 

 femur without distinct preapical anteroventral bristles. Venation as 

 in figure I ; \eins not setulose. 



Length, 4 mm. 



Type. — Male allotype, and one paratype in poor condition, Mexico 

 City, Mexico, May 22, 1922 (E. G. Smyth). Cat. No. 28437, 

 U.S.N.M. 



This species has much the appearance of a Trypetid, but is a 

 true Sapromyzid. 



STENOLAUXANIA, new genus 



Generic characters. — Similar to Lauxaniella Malloch, differing 

 from it in having the face transversely striate, the frons with fainter 

 striae, and the anterior orbital bristle curved mesad. 



Genotype. — Stenolauxania striata., new species. 



STENOLAUXANIA STRIATA, new species 



Mole and female. — Black, subopaque, abdomen shining. Head 

 black, interfrontalia shining, with a slight violet or purple tinge, or- 

 bits opaque black; face shining; first and second antennal segments 

 and extreme base of third yellow, remainder of third black; arista 

 black; palpi fuscous. Thorax with a slightly shagreened appearance 

 on dorsum. Abdomen black. Legs tawny yellow, apices of fore 



