NEW MUSCOID FLIES— TOWNSEND. 301 



talia. Fronto-orbitals set farther back and close to frontalia. Outer 

 verticals well developed. Parafacials slightly broader below than 

 above. Palpi slender and only faintly thickened at tip. No median 

 marginal pair of macrochaetae on second abdominal segment. 



THERESIOPSIS FICORUM, new species. 



Length of body, 8 mm. ; of wing, 7 mm. One female, Pekalongan, 

 Java, given with query as reared from Ficus-horcr, March, 1912 (K. 

 W. Dammerman, No. 304). 



Pale testaceous to brownish, with satiny-silver pollen. Antennae 

 and palpi fulvorufous. Frontalia brown. Head more or less poUi- 

 nose over a fulvotestaceous ground color. Tliorax pollinose, leaving 

 three narrow vittae in middle before suture, and a heavy double- 

 blotch vitta on each side; viewed from in front the posterior blotches 

 are confluent along suture. Scutellum silvery on apical half, rich 

 dark sepia on base. Abdomen rich dark sepia except oblique anterior 

 corners of second segment, and irregular basal half of third and fourth 

 segments, which are rufotestaceous and silvered. Legs brown to 

 blackish. Wings subhyaline, but brown along first vein and basal 

 half of third and fourth veins. Tegulae white. 



Eolotype.— 'No. 20028, U.S.N.M. 



MESEMBRIOPHYTO, new genus. 



Genotype. — Mesemhriophyto magcllana, new species. 



Differs from Arctophyto as follows: Female. Head more elongate, 

 the front more produced. Antennal and vibrissal axes equal. Ver- 

 tex not over one-third head width. Frontalia not broader than one 

 parafrontal. Antennae not separated, third joint scarcely longer than 

 second, arista bare. Facial carina scarcely developed, epistoma nar- 

 rower. Apical scutellar pair of bristles as long as the posterior of the 

 two laterals, decussate at tips. No median marginal bristles on first 

 abdominal segment, a weak median marginal pair on second; discal 

 and marginal on last two segments, the discal of third in straggling 

 row, but the marginal regular and rather strong. Apical cell closed 

 in border a little before tip of wing; hind cross vein not so close to 

 cubitus. 



MESEMBRIOPHYTO MAGELLANA, new species. 



Length of body, 7 mm.; of wing, 7.25 mm. One female, Sandy 

 Point, Straits of Magellan (Ace. 21699 U. S. Fish Comm.). 



Dark brownish, lightly cinereous pollinose. Frontalia, first two 

 antennal joints, clypeus, facialia, and cheek-grooves brownish- 

 rufous; palpi fulvous, third antennal joint and arista black, epis- 

 toma brownish. Parafrontals cinerous, parafacials and ocellar 

 triangle dull golden pollmose; occiput and cheeks with grayish bloom. 

 Pollen of mesoscutum and scutellum with a dull gold tinge; four 



