DIXIDAE. RHYPHIDAE. 41 



a different structure etc. One or two ofhor species, as yet nn- 

 described, occur in the United Stages, which are still more like 

 the European D. sylvicola, although they also have a discal cell. 



Ctcnophora. ( 44 ). 



Meigen, Illiger's Magaz. II, 263; 1803. 



*apieata 0. Sacken, Proc. Ent. Soc. Phil. 1864,46 New Hampshire. 



dorsalis Walker, List, etc. I, 76. - - Newfoundland. 

 *frontalis Sacken, Proc. Ent. Soc. Phil. 1864,48. - - Massachusetts. 



(?) Ctenopliora succedens Walker, Dipt. Saund., 448. - - Canada. 

 *fumipeimis 0. Sacken, Proc. Ent. Soc. Phil. 1864, 47 - Virginia. 

 *nubecnla 0. Sacken, Proc. Ent. Soc. Phil. 1864, 45. - - Illinois. 

 *topazina 0. Sacken, Proc. Ent. Soc. Phil. 1864, 47. - - Virginia. 

 *aiig i nstii)ennis Loew, Centur. X, 3; Sacken, Western Diptera, 211. 

 California (among the redwoods in the Coast-Range, not rare). 



Observation. For Ptilogyna fuliginosa Macquart, see the 

 note. ( 4C ). 



FAMILY DIXIDAE. 

 IHxa. 



Meigen, Syst Beschr. I, 216; 1818. 



*centralis Loew, Centur. Ill, 3. New York 



(?) Uixa itoca Walker, List, etc. I, 85. New York Factory. 

 *clavata Loew, Centur. VIII, 1. - - Massachusetts. 

 *fusca Loew, Centur. Ill, 5 - New York. 



* niarginata Loew, Centur. Ill, 1. - - Distr. Columbia. 



* notata Loew, Centur. III. 4. - - Maryland. 



* tema Loew, Centur. Ill, 2. - - New York. 



(?) Dixa recens Walker, List, etc. I, 85. New York Factory. 

 *venosa Loew, Centur. X, 1. Texas. 



Observation. About an undescribed Dixa from California, 

 compare 0. Sacken, Western Diptera, 196. 



FAMILY RHYPHIDAE. 

 Rhyphns. 



Latreille, Hist. Nat. etc. XIV, 291; 1804. 



*alternatus Say, J. Acad. Phil. Ill, 27, 2; Compl. Wr. II, 51; Wiede- 



mann, Auss. Zw. I, 82, 1. - - Atlantic States. 

 *fenestralis Scopoli; Meigen, Syst. Beschr. I, 323. - Europe and 



North America (Loew, Sillim. Journ. 1. c.). 

 *punctatus Meigen, etc. -- Europe and North America (Loew, Sillim. 



Journ. 1. c.). 

 Elijiitlnis mary hiatus Say, J. Acad. Phil. Ill, 27, 1 ; Compl. Wr. II, 50; 



Wiedem. Auss. Zw. 1, 82, 2 (Loew, Sillim. Journ. N. Ser. XXXVII, 317). 



