Dec, I9I3-] Melander: Synopsis of Diptera. 297 



ZAGONIA Coquillett. 



Entirely yellow, including the hairs and bristles, except that those of the costa, 

 the spurs at the end of each tarsal joint, the claws and sometimes the 

 palpi are black; female with the third joint of the antennae black, male 

 with the antennae entirely yellow. 2.8 mm. (Cal., Or., Wash.*) 

 (Invert. Pacif., z-j, 1904. Syn. : Siligo oregona Aldrich, Trans. Am. 

 Ent. Soc, XXXIV, 99, 1908.) flava Coquillett. 



TETHINA Haliday. 



Vibrissa! angle projecting; face one half as long as the front; three fronto- 

 orbitals ; gray-black, the front anteriorly and the face yellow. 3 mm. 

 (Pender Island, B. C, not Idaho; Wash.) (Wien. ent. Ztg., XXX, 

 41, 191 1.) rostrata Hendel. 



Face vertical without projecting vibrissa! angle; face more than one half as 

 long as the front 2. 



2. Two small fronto-orbitals ; the cheeks, face and anterior portion of the front 



whitish yellow, the light color of the front gradually merging with 



the brownish vertex 3. 



One large fronto-orbital ; front coxae pruinose and white, remainder of legs 

 black ; center of front orange, sharply delimited from the brown ver- 

 tical triangle. 2.5 mm, (Ga., La.,* Cal.,* Wash.,* Alaska.) (Pelo- 

 tnyia occidentalis Williston.) {Rhicno'essa.) coronata Loew. 



3. Largely olivaceous black, including all the coxae, femora and tibiae ; tarsi 



black apically; antennae mostly black. 2 mm. (Mass., R. I., Cal., 



Wash.,* Id.,* Alaska.) (Rhicnoessa.) parvula Loew. 



Cinereous ; legs yellow, only the femora in part cinereous and the last tarsal 

 joint blackish; antennae mostly yellow. 1.5 mm. (Tex.*) 



inaritima new species. 



Tethina maritima new species. 



Female. — Length 1.5 mm. Yellowish-cinereous, bristles black. Occiput 

 and ocellar triangle yellow-cinereous, front yellow, face and cheeks white. 

 Antennae yellowish brown, a little darker above, the arista pale. Mouth-parts 

 yellow, the small clypeus black. One or two pairs of minute fronto-orbitals ; 

 ocellar bristles widely distant from each other ; no postverticals. Thorax and 

 abdomen densely yellow-cinereous pollinose, the last abdominal segment yel- 

 lowish ; four dorsocentrals, one presutural, one sternopleural, one mesopleural 

 bristle. Legs including the coxae yellow, the femora broadly diffused with the 

 body-color, the last tarsal joint brown. Halteres yellow. Wings faintly yel- 

 lowish and faintly opalescent; the penultimate section of the fourth vein two 

 thirds as long as the ultimate section of the fifth vein. 



Three specimens, Galveston, Texas, taken during the early part of 

 June, 1900. 



