APPENDIX. 389 



Dr. Back, who has examined the type of Sfihagens, distinguishes 

 the genus as follows: 



"Front and middle femora with a patch of short, stout bristles below; 

 third antennal joint without excision on inner distal part. 



Sphageus. 



Front and middle femora without such patches of bristles; third an- 

 tennal joint with excision on inner distal part; near the prox- 

 imal margin of second and third abdominal segments with a 

 white or yellowish pollinose crossband. . . Dizonias." 



Dr. Back also has made ' Habropogon" bilineatus the type of a new 

 genus, with the following definition: 



"Front not unusually widened above; bristles on the lateral margin 

 and posterior callosities and scutellar margin numerous and 

 well developed; third antennal joint short and broad; species 

 much resembling fttenopogon in general appearance. 



Willistonina." 



Page 195, near middle for 'fraudigera 1 read sabnlonum. 



Page 198, couplet 7, third line, for '7' read 8; in couplets n and 12, 

 transpose '12' and '13'. 



Page 221; couplet 28 first line, for 'male' read female. 



Page 203. The genus Dasyllis, according to Col. Yerbury, comprises 

 but a single species, the type; the American species should be united 

 with Laphria. In this opinion I agree. According to the same author- 

 ity Nusa is not a synonym for Andrenosoma, which should be sub- 

 stituted for that word in the eleventh line. 



Page 206. Mr. Verrall has resuscitated Dialineura Rond. for those 

 species of Thereva having a hairy front, the face bare and the first 

 antennal joint thickened. This definition will apply to some, prob- 

 ably to all of those species included under 'Thereva, pt.' in couplet 

 3 and should be substituted therefor. 



Page 217. The type specimen of Rhabdopselaphus inns Bigot, one 

 of the three or four genera of this family I had never seen, in Mr. 

 Verrall's collection, lacks the head; otherwise it is a true Geron. Bigot 

 erred in ascribing three submarginal cells to the genus. 



P. 256, couplet 53, for 'Licastrirhyncha' read Lycastrirhyncha 



Page 269, sixth line from bottom, for 'irridescent wing' read irides- 

 cent wings. 



Page 277, couplet 3, first line, for '5' read 4; Callopistromyia 

 Hendel (1907) replaces Callopistria, preoc. Eurycephalomyia 

 Hendel (ibid) replaces Eurycephala, preoc. 



Page 279, first line, for 'Richarulia' read Richardia; Macroste- 

 nomyia Hendel (1907) replaces Stenomacra, preoc. 



Page 283, first couplet, for 'slump' read stump, and 'Toxytrypana' 

 read Toxotrypana. 



Page 288. Hendel (Wien. ent. Zeit., 1907, 228) adopts Ch&tocceiia 

 G. T. for several species of Sapromyza, of which S. angustipennis (5) 

 is one, having long, pictured wings and small tubercles at the insertion 

 of the fronto-orbital bristles. Camptoprosopella melanoptera, gen. 

 et sp. nov. (Puebla, Mex.) he distinguishes from Physogenua by the 

 nongibbous face, which is straight and retreating save at oral margin, 



