Vol. XXV] ENTOMOLOGICAL NEWS. 245 



This species should not be confused with the Formosa spe- 

 cies (P. cyanoprosopa Hend.) on account of the black hal- 

 teres and the structure of the fore tarsi of the male, as well 

 as other characters which may be gleaned from the full de- 

 scription given above. 



> 



PLANINASUS new genus. 



The position of this genus is doubtful. It evidently is not 

 a typical Ephydrid, although superficially resembling some of 

 the genera allied to Ephydra. The preapical tibial bristles are 

 well developed as well as the second basal and anal cells. The 

 dorsocentral bristles are in the same series as the prescutellars, 

 and there are two distinct sternopleural bristles. It is prob- 

 ably to a genus belonging to an independent line originating 

 from the common ancestor of the Ephydridae and Droso- 

 philidae. The genus may be characterized as follows : 



Head (PI. X, figures 5-6) higher than long, broader 

 than high. Eyes nearly as high as head, oblique, bare, not 

 protruding. Occiput concave above, vertex sharp and con- 

 cave. Front broader at antennae than at vertex ; ocellar tuber- 

 cle small, near occiput ; inner and outer verticals present, no 

 ocellars or post-verticals, I latero-reclinate and i mesally 

 inclined orbitals with their bases close and situated opposite 

 anterior ocellus. Antennae widely separated by an oblique 

 flattened area limited above by the transversely straight lunu- 

 lar ridge and extending to near middle of face. Face broad 

 with lower part vertical, transversely convex, with strong 

 bristles in transverse series near oral margin. Antennal foveae 

 apparent, with parafacial groove running close to orbits. 

 Mouth large, as broad as face above; clypeus retracted. An- 

 tennae (as in figure 7) so articulated at first joint that the 

 inner surface of the second is turned obliquely forward. 



Thorax longer than broad, obliquely as high with sterno- 

 pleura well developed. One dorsocentral at suture with few 

 setulae anteriorly, i pair of widely separated prescutellars in 

 same series as dorsocentrals, i post-, i supra-alar, 2 noto- 

 pleurals, i or more mesopleurals, 2 sternopleurals, 2 scutellars. 

 Abdomen ovate narrower than thorax. 



