222 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sf.r. 



be some confusion as to its identity. The sexes are in some 

 cases quite different and the allotype is almost as important as 

 the type. In this paper four allotypes are described in order to 

 establish the species more firmly. One merely adds to the con- 

 fusion by describing a new species from female specimens only 

 in such a group as the asilid genus Cyrtopogon, and there are 

 many such groups in the diptera. 



1. Platyura nigra Cole, new species 

 (Plate 14, fig. 1) 



Male: Length S.S mm. Head, antennae and palpi black; pile black; 

 thorax and pleura black with black pile ; scutellum black ; abdomen entirely 

 black with short reclinate black pile; genitalia black, with black pile; 

 halteres black. 



Coxae black with black pile; femora and tibiae yellowish, the tarsi blackisih 

 brown; costal region yellowish, the center of wing grayish hyaline, the 

 posterior margin and apical fourth pale-infuscated ; veins of wing brown; 

 subcostal vein ending in costa proximad of base of radial sector; Ra+s 

 ending in costa disitad of end of Ri, and almost perpendicular to other 

 radial vein. The coalesced part of the media is slightly greater than the 

 petiole. Subcostal cross-vein absent. 



Holotype (No. 463), female, collected at Forest Grove, 

 Oregon, May 20, 1918 (F. R. Cole), in the Museum of the 

 California Academy of Sciences. 



This species will run to melasoma Loew in Johannsen's table 

 of species in "Mycetophilidae of North America." The wing 

 differs, however, and there is no yellow color on the thorax. 



2. Dziedzickia immaculata Cole, new species 



(Plate 14, fig. 2) 



Male: Length 4 mm. Head black. Antennae blackish, the first two 

 segments yellowish ; mesonotum black with yellowish pile ; humeri yellow- 

 ish ; scutellum black ; pleura black ; halteres yellow. 



Abdomen blackish with pale yellowish pile ; posterior margins of second, 

 third and fourth ventral segments yellowish, the color extending up on 

 dorsum but faintly; genitalia black with blackish pile. 



Coxae yellow, the two hind pair faintly infuscated ; femora yellow ; tibiae 

 brownish yellow, the tarsi darker ; tibial spurs yellowish ; wings grayish 

 hyaline ; radial veins blackish and heavier than others. Subcosta ending in 

 the first radial vein slightly beyond middle of small cell. Petiole of cell 

 Ma about twice as long as R-M cross-vein. Cubitus forks shortly before 

 the R-M cross-vein. 



