308 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



pleuron longer and more erect than on mesonotum; legs black except 

 that basal tliree-fourtlis of tibiae are light brown; wing hyaline, 

 vein Ml present but weak, longer than R4+5, crossvein r-m pale, 

 nearly reaching bend in vein M4, vein Mg present but quite pale, 

 m-cu crossvein absent (venation about as in pi. 3, fig. 11); squama 

 semitransparent, slightly browned throughout, margin dark brown, 

 halter knob brown. 



Abdomen dark brown, rather narrow, with typical Ogcodes pattern 

 (pi. 5, fig. 29) except that posterior tergal fasciae are of nearly even 

 length throughout and occupy only one-sixth of each tergite, entire 

 dorsum covered with sparse, short, golden, slightly appressed pile; 

 sternites dark brown except for whitish brown in median area of 

 II, sternites iii-vi mostly whitish brown but of same pattern as 11. 



Genitaha dark brown, quite small; aedeagus as in plate 8, figure 44; 

 ejaculatory apodeme as in plate 13, figure 107. 



Female: Unknown. 



Holotype: Male, Currahee Mt., Stephens Co., Georgia, July 23, 

 1952 (H. R. Dodge, USNM 61729). 



Paratopotype: 1 cf (CAS). 



Paratype: 1 cf, Kennesaw Mt., Cobb Co., Georgia, June 15, 1952 

 (Dodge, Sudia, Seago, EIS). 



According to information received from H. Dodge in a letter 

 (1953), "the flies were taken from the hand rail of the observation 

 tower on the top of Currahee Mountain, and though quite sluggish, 

 were not easily taken by net." He also said several more specimens 

 were seen but could not be caught. To my knowledge, specimens of 

 Ogcodes have been collected nearly everywhere except on mountain 

 tops. The only other record of this sort was cited by Brunetti 

 (1920, p. 171) for Ogcodes angustimarginatus Brunetti in Ceylon. 

 His specimen was likewise a male, and it may be that fm-ther collecting 

 on mountain tops would 34eld some good records of this and other 

 genera of Acroceridae. 



Remarks: 0. sahroskyi has aflinities with adaptatus, hoharti, 

 canadensis and pallidipennis, though in its distribution it approaches 

 only the last-named species. It is believed to be the most highly 

 evolved species of the pallidipemiis group in the Nearctic subregion, 

 and most closely related to canadensis (see text fig. 2). The following 

 combination of characters will separate sahroskyi from other Ogcodes 

 species: the narrow posterior tergal fasciae, golden pile, narrow 

 abdomen, and structure of male genitaha. The aedeagus of sahroskyi 

 resembles that of the Palaearctic gibbosus, but this apparently is a 

 case of convergence, as other morphological features are quite distinct. 



It is a pleasure to name this species after Mr. Curtis W. Sabrosky, 

 whose recent studies on the family Acroceridae have contributed much 



