1919.] NATURAL SCIENCES OF PHILADELPHIA. 183 



Eclimus yosemite new species. 



The two specimens representing this species are so different in 

 coloration that, were thej' not taken at the same place and time, one 

 would be certain to consider them distinct species. Of course, it 

 is possible that they are distinct, but it would be inadvisable to 

 consider them as such. The male differs from the description of 

 luciifer 0. S., in that the mesonotum is not mucronate. The female 

 differs from magnus O. S., in that the pile of the mesonotum is white. 



cf. Black; squamse and stalk of halteres, pale. Wings nearly 

 uniformly intense brown, becoming most intense along costa, with 

 slight dilutions basally towards axillary cell, Opaque, velvety 

 black, but oral and scutellar margins shining. All bristles black. 

 Pile black on ocellar tubercle, first and second antennal joints, frons, 

 face, occiput medianly as a continuation of the notopleural stripe, 

 lateral margin of abdomen, all of sixth and following segments, 

 ventral segments, and legs. White on cheeks, occiput below, pleura, 

 metapleural tuft, and squamse. Yellowish on occiput above, meso- 

 notmn, scutellum, dorsum of segments one to five. Some pile on 

 mesonotum laterally; apices of abdominal segments one to five, 

 wooly and somewhat appressed. Head much broader than high, 

 subhemispherical in profile. Eyes separated for about width of 

 first antennal joint. Third antennal longer than first. Mesonotum 

 not mucronate. Costa smooth. Length, 8 mm. 



9 . Similar but larger (12 mm.) and more robust. Wings dilute 

 brown, becoming intense at costa and on anterior cubital vein. 

 Bristles pale. Pile on occiput above, mesonotum, scutellum, squamse, 

 metapleural tuft, and dorsum of segments 1^, white, and generally 

 long, becoming appressed and curly on lateral mesonotal margins 

 and apical margins of abdominal segments. All other pile on head, 

 pleura, venter, and fifth and following segments, black and abundant. 

 Length, 12 mm. 



Type.—d"; Yosemite Valley, California, May 22, 1908, (E. T. 

 Cresson, Jr.). [A. N. S. P. No. 6206.] Paratijpe. — 9 ; topotypical. 



GERON Meigen. 



Were it possible to have all material of this genus in perfect, un- 

 abraded condition, there might be some chance of finding more 

 characters of differentiation than one is able to do with the specimens 

 usually met with in collections. The study and examination of the 

 small amount of material before me, however, gave some results 

 worthy of note, and which will at least separate several species 



