22 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



TROPHOPS, new genus 



Somewhat allied to Pexomyia {ruhrifrons Perris, the genotype), 

 but differing in having the vibrissae distinctly above oral margin, no 

 costal spine nor infrasquamal setules. 



Hypopleural bristles and postscutellum present; eyes and arista 

 bare ; palpi and proboscis of ordinary form ; paraf rontals and para- 

 facials broad, especially the latter, which are bare and about half 

 as wide as clypeal depression; facial ridges bare, low, vibrissae far 

 apart and much above the epistoma, only a little below the lowest 

 curve of the eye; cheeks broad and bulging, almost half the eye 

 height. Third antennal joint nearly three times the second, rather 

 slender and tapering, not quite reaching vibrissae. Length of head 

 at antennae slightly greater than at vibrissae ; frontal profile a little 

 greater than facial ; clypeus flat, moderately broad. 



Scutellum with three lateral pairs of bristles, the apical pair al- 

 most equally large, decussate or not, depressed. No discal abdominal 

 bristles on second and third segments. 



First vein bare, third with one or two bristles at base, fourth 

 with bend slightly rounded, thence a little concave, ending distinctly, 

 yet not very far before apex of wing. Hind cross vein concave 

 and a little oblique, joining fourth vein at three-fifths of the distance 

 from anterior cross vein to bend. 



Genotype. — Trophops clauseni, new species. 



TROPHOPS CLAUSENI, new species 



Black with yellowish pollen on head and thorax. Abdomen shin- 

 ing black with broad bands of gray pollen on the second, third, and 

 fourth segments. 



Male. — Front 0.31 of the head width. Head with somewhat silvery 

 pollen except on front and upper orbits where it is distinctly yellow. 

 Frontal stripe wider than one paraf acial. Verticals one pair; ocel- 

 lars of normal size and proclinate; two upper orbitals reclinate, 

 strong, the others rather weak, the lowest at middle of second 

 antennal joint. Antennae black, tip of second joint and basal third 

 of third joint reddish; third joint decidedly slender and tapering, 

 a little more than twice the second, not reaching to vibrissae. Cheek 

 covered with fine dark hair. Palpi brown. Thorax with a pair of 

 very slender stripes outside the acrostichals, much enlarged behind 

 the suture; an outer stripe is broadly divided into two spots, the 

 hindmost elongated. Pleurae black with thin gray pollen. Chae- 

 totaxy : Acrostichal, 3, 3 ; dorsocentral, 3, 4 ; humeral, 2 ; posthumeral, 

 2; notopleural, 2 ; presutural, 2 (the inner rather large) ; supraalar, 3; 

 intraalar, 3 ; postalar, 2 ; sternopleural, 2, 1 ; pteropleural small. No 



