1914.] NATURAL SCIENCES OF PHILADELPHIA. 581 



March (Van Duzee). Clear Creek, Clear Creek Co., Col., June 10, 

 1912 (Osier). Kirbyville, Jasper Co., Tex., March 21, 1908 (E. S. 

 Tucker). 



Rhipidia (Arhipidia) schwarzi Alexander. 



1912. Rhipidia schwarzi Alexander; Bulletin of the Brooklyn Entomological 

 Society, vol. 8, pp. 13, 14, pi. 1, fig. e. 



One female from Biscayne Bay, Dade Co., Fla., taken by Mrs. 

 Slosson. Three females from Braidentown, Manatee Co., Fla., 

 taken in IVIarch, 1913, by Mr. M. C. Van Duzee. 



Rhipidia (Arhipidia) shannoni sp- n. 



Antennte subpectinate, black; thoracic dorsum without a broad 

 pale margin in front; postnotum velvety black; wings Avith a few 

 dark brown spots and with abundant gray dots in all the cells. 



Male, length, 4.9-5.1 mm.; wing, 6.7-6.8 mm. 



Female, length, 5.4-5.6 mm.; wing, 5.8-7.2 mm. 



Rostrum, palpi and antennae black. Head gray. 



Mesonotal prsescutum yellowish brown without distinct markings 

 except behind near the suture where there are two brown spots on 

 either side of the median line, narrowly separated from one another, 

 a more linear mark on either side; scutum very light yellow medially, 

 darker on the lobes with a dark brown ring on each lobe; scutellum 

 light yellow with a dusky mark on either side of the middle line; 

 postnotum with a deep velvety black triangle mth its point behind, 

 the sclerite pale on the sides. Pleurge brown with a gray bloom wnth 

 two narrow brown stripes, the more dorsal less clean-cut, the ventral 

 one narrow, well-defined, beginning on the fore coxa^ traversing the 

 bases of the other coxae. Halteres brownish yellow. Legs, coxae 

 yellow, brown at the base on the outer face, trochanters dull yellow, 

 femora yellowish brown, tibiae and tarsi yellowish brown, the two 

 apical segments of the latter black. Wings light yellow with a few 

 large broAvn spots as follows: a large one beyond the middle of vein 

 Sc, smaller ones above the arculus, origin of Rs, tip of >Sci and a large 

 rounded spot at the stigma; paler seams along the cord and outer 

 end of cell 1st M,, abundant pale gray dots in all the cells; venation 

 (PL XXVII, fig. 23). 

 Abdomen grayish brown, the pleural line narrowly dark. 

 Holotype, d', Plummers Island, Md., June 14, 1913 (R. C. 

 Shannon) . 



Allotype, 9 , topotypic, August 18, 1912 (J. R. IVIalloch). 

 Paratype, cf, Cabin John. Md., August 30 (Fred'k Knab); 9, 

 Gatun, Canal Zone, Panama, December 12, 1912, at light (J. Zetek). 



