424 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 49. 



pair and one lateral marginal, one with one lateral marginal. Front 

 tarsi of female widened, hind tibiae not ciliate. Apical cell open in 

 wingtip. Cubitus rounded, as near to hind margin of wing as is the 

 posterior end of hind crossvein, latter nearer to cubitus. No costal 

 spine. First vem bare, third bristly only at base. 



MICRONYCHIOPS AURESCENS, new species. 



Length of body, 7 mm.; of wing, 6 mm. One female, Huancayo, 

 Peru, about 10,500 feet, on foliage of Baccharis, sp., March 25, 1913 

 (Townsend) . 



Dark in ground color, pale golden pollinose. Head thickly pollinose, 

 with pale gold tinge which is most marked on facial plate and para- 

 frontals. Mesoscutum, scutellum, and abdomen quite as thickly 

 pale gold pollinose; former with two linear median vittae stopping 

 a little behind suture, and two interrupted outer vittae of the semi- 

 colon type extending farther back. Abdomen submarmorate in a 

 faint median vitta on first two segments, hind lateral spots to all seg- 

 ments, and lighter median pair of spots on front margin of third and 

 fourth segments. Femora and tibiae pale rufous or subfulvous, tarsi 

 black. Wings practically clear. Tegulae very pale pearly-yellowish. 



Holotype.-^&t. No. 19445, U.S.N.M. TD 4129. 



OESTROGASTROPSIS, new genus. 



Genotype. — Oestrogastropsis mexicana, new species. 



Differs from Oestrogaster as follows : 



Female. — Front nearly one-fourth head-width, sides slightly bulged 

 on middle. Small pair of ocellars. Face at vibrissae (space between 

 eyes) hardly one-thhd head-width. Antennae inserted on eye- 

 middle. Parafrontals as wide as frontalia, or slightly wider. Para- 

 facials about as wide as facialia. Outer verticals well developed, fully 

 one-half as long as inner. The two proclinate fronto-orbitals are well 

 out of line of frontals. Three reclinate fronto-orbitals, the hind one 

 weak. Three lateral scutellar bristles, the hindmost reachmg nearly 

 or quite to base of third abdominal segment; a weak apical pair of 

 divaricate bristles present, and a weak discal pair. Abdominal 

 macrochaetae stronger, erect; second segment with median discal pair; 

 third segment with four median discal in transverse line. Genital 

 opening not pushed so far forward, being on apical two-thirds of abdo- 

 men; intermediate segments comparatively little shortened ventrally ; 

 anal segment keellike on median posteroventral line, rounded on pos- 

 terior aspect. Two strong spines on middle of front aspect of middle 

 femora. Hind tarsi slightly longer than hind tibiae. Apical cell 

 almost closed, ending slightly before wingtip. Hind crossvein 

 scarcely approximated to cubitus. Third vein with two or three 

 bristles at base. 



