48 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



65. Thorax and abdomen black ; halteres dull yellow, with black knobs 66. 



Thorax and abdomen more or less yellow, but the halteres pale even if these 



parts are largely, or entirely, black 69. 



66. Thoracic dorsum dull, evenly and densely brownish gray dusted; frous 



entirely fuscous, and not shining either on triangle or orbital stripes ; 



intradorsocentral hairs in six series opacithorax Malloch. 



Thoracic dorsum, and at least the frontal triangle and orbital stripes, 

 distinctly shining, the thorax without dusting on disk ; intradorsocentral 

 hairs in at least eight series 67. 



67. Inner cross vein but little, if any, proximad of middle of discal cell ; 



outer cross vein at less than twice its own length from inner; tibiae 



largely testaceous yellow signatifrons (Kertesz). 



Inner cross vein very conspicuously proximad of middle of disscal cell, 

 sometimes at one-third from its base ; outer cross vein at more than 

 twice its own length from inner ; tibiae largely darkenc^d 68. 



68. Ocellar bristles little shorter than anterior orbitals ; male hypopygium as 



Figure 67 piceoides, new species. 



Ocellar bristles much shorter and weaker than anterior orbitals; male 

 hypopygium as Figure 68 nigfrita, new species. 



69. Thorax with three or four pairs of strong acrosthichal bristles 70. 



Thorax with only the prescutellar pair of acrostichal bristles developed.- 71. 



70. Head, thorax, and obdomen, shining testaceous yellow, the abdomen with a 



pair of round black spots on fourth visible tergite ; anterior pair of 

 acrostichals presutural; anterior orbitals much longer and stronger than 



ocellars luzonensis, new species. 



Head and thorax partly, abdomen entirely, black ; anterior pair of acros- 

 tichals just behind suture; anterior orbitals a little shorter than ocellars. 



robusta, new species. 



71. Hind tibia lacking the preapical dorsal bristle; anterior orbital bristle 



rarely over half as long as posterior one ; third antennal segment black- 

 ened at apex ; shining fulvous yellow si)ecies 72. 



Hind tibia with a distinct preapical dorsal bristle, sometimes quite 

 short 78. 



72. A conspicuous black mark at base of scutellum ; anterior orbital bristle 



about one-third as long as posterior one 73. 



No black mark at base of scutellum ; anterior ()rbital bristle over one-third 

 as long as posterior one 77. 



73. Face entirely deep black from eye to eye atriceps, new species. 



Face entirely yellow 74. 



74. Thorax with two submedian fuscous vittae which begin behind anterior 



margin, and connect with the black mark on base of scutellum ; mid 

 femur with some long fine bristles on basal half of posteroventral sur- 

 face, and hind tibia with a sharp carina on dorsal surface aplcally in 



male; hypopj'gium as Figure 69 bilineella (Frey). 



Thorax without fuscous dorsal vittae, ptisterlor margin of mesonotum black 

 centrally, the black color connected with the black basal mark on 

 scutellum 75. 



75. Palpi black at apices ; outer cross vein of wing quite distinctly clouded ; 



n)id fenmr in male with .some long fine bristles on basal half of postero- 

 ventral surface ; hind tibia of male witli a sharp carina on dorsal surface 



aplcally; hypopygium as Figure 70 nothosticta (Frey). 



Palpi entirely yellow ; outer cross vein not at all clouded ; mid femur in 

 male without long posteroventral bristles; hind tibia not sharply carina te 

 on dorsum in either sex 76. 



