g4 A REVISION- OF THE NEARCTIC SCIOMYZIDAE 



3. Frons broadly excavated with weak ridges; hind cross-vein strongly bowed 



outwards 



. tenuicornis 



Frons narrowly excavated with prominent ridges; hind cross-vein straight. 4 

 4. Hind femora of male deeply notched beneath; genital segment of female 



dorso-ventrally developed, with strong carina above armipes 



Sexes not possessing such characters pusillus 



Sepedon fuscipennis Loew 



IS.')'.). S( jHdon fiiscipoinis Loew, W'ien. Ent. Monats., iii, 299. 



(^ 9 . This species has the second antenna! joint robust, broader than 

 the first, as broad as the base of the tapering third. The dark frontal vel- 

 vety spots are sometimes represented only by reddish stains. Length.— 

 7-8 mm. 



This and the following species form a group noticeal)le for 

 their large size, o])li(]ue or- arcuate hind cross-veins, and the 

 ])roadly excavated frons with its weak ridges. 



Specimens Examined. — 7 cf , 8 9 . 



Canada: Aweme, Manitoba, July 30, (E. Griddle), [A. N. S. P.]. 



Rhode Island: Rivcrton, July 31, [B. S. N. H.]. 



Massachusetts: Cohasset, September 1; Southbridge, August 27; Welles- 

 ley, September 23, [all B. S. N. H.]. 



New York: Ithaca, March 26 to June, [Cornell]; Lake George, July 24-25, 

 (A. K. Fisher), [Biol. Surv.j; Wyandanch, Long Island, May 1, (W. T. Davis), 

 [Davis]. 



Pennsylvania: Swarthmore, October 19, (E. T. Gresson), [A. N. S. P.]. 



Maryland: Chestertown, August 23, (E. G. Vanatta), [A. N. S. P.]. 



Sepedon paciflca C'resson 



1914. Sepedon paeijica Gresson, Ent. News, xxv, 457. 



This species may be readily distinguished l^y the characters 

 given in the table. The third and fourth veins are noticeably 

 convergent. It is a slightl}^ larger species than the preceding one 

 and occurs, as far as known, only west of the Rocky Mountains. 



Specimens Examined. — 8 cf , 13 9- 



California: Berkeley Hills, Sei)tomber 9, (J. C. Bradley), [Cornell]; 

 Descanso, San Diego County, August 7, (J. G. Bradley), [Cornell]; Redwood 

 Canyon, Marin County, May 17, (E. T. Gresson, Jr.), [A. N. S. P.]. 



Wahhin(;t<)n: (one spm. without other data). 



Utah: Mouth of Bear River, July 17 to September 30, (A. ^^'ctmore); 

 Ogden, October 4, (A. Wetmore), [all Biol. Surv.]. 



Sepedon tenuicornis new species 



cT, 9 . Similar to fuscipennis, but the second antennal joint is slender 

 as in armipes and pusillus, narrower than the first joint, elongate, four to 

 five times as long as its width at a])ex; small cross-vein less oblique, but more 

 strongly bowed outwards. It differs from the other species with slender 



