78 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



In imguicornis subspecies saratogensis there are one or two, rarely 

 three bristles. The general color is pale, and the wing design is 

 also diluted. There seems to be no structural characters of 

 differentiation, but from the constant number of antennal bristles, 

 in the series examined, it seems advisable to consider this as a 

 distinct species. 



This was originally described from Washington Territory. I 

 have a male from the same locality ("W. T."), which agrees 

 with the original description, and I do not doubt this determina- 

 tion. I have also two pairs from Cayton, Shasta County, Cali- 

 fornia, July 9-17, (E. P. VanDuzee), [Cal. Ac. Sci.]. 

 Limnia shannoni new species (PI. I, fig. 6; pi. Ill, fig. 36.) 



Somewhat similar to pubescens Day, especially in size, general 

 build and color, but the wing design offers a very distinct char- 

 acter of differentiation. In this respect it resembles costalis, 

 but only noticeably so along the costa. 



9 . General color tawny. Frons opaque, wax yellow, with anterior angles 

 and the broad sunken median stripe polished and darker; a black spot at 

 each of the two frontals and one opposite antennae. Face sparingly silvery, 

 mottled with dark and light areas; epistoma light yellow. Cheeks yellow, 

 silvery, with dark orbital spot. Occiput sparingly silvery except a broad 

 post-orbital horizontal band. Second antennal joint polished laterally, with 

 a distinct dark spot; arista densely white pubescent, with yellow base. Meso- 

 notum with the usual yellow median stripe between two gray ones; lateral 

 margins shining and grayish. Praescutellar bristles present. Scutellum 

 pale on disk. Pleura below and metanotum gray. Abdomen with indis- 

 tinct dark stripe. Legs pale yellow, slightly darker at tips of tarsi. Wings 

 yellowish hyaline, with fuscous design as figured (fig. 6). 



Head in profile as figured (fig. 36). Frons longer than broad, horizontal; 

 ocellar bristles weak, much weaker than the strong post- verticals; the two 

 frontals also weak. Presutural and prescutellar bristles present. Length. — 

 6 to 7 mm. 



Tijpe. — 9; Plummer's Island, Maryland, October 16, 1913, 

 (R. C'. Shannon), [U. S. N. M.]. Paratype.—l 9 ; topotypical, 

 October 28, 1915. 



Limnia unguicornis Scopoli 



1703. MiLsca unyuicornis Scopoli, Ent. Carn., 335. 



1S20. Telanoccra pratorum Fallen, Dipt. Suec, Sciom., 6. 



1830. Limnia liinbnta Desvoidy, Myod., 685. 



li)02. Limnia unguicornis Hendel, Abh. K. K. Zool.-Bot. Ge.sell., Wien., ii, 

 20. 



