APPENDIX. 



During the printing of this work several genera new 

 to America have been added in recent publications; other 

 changes or additions I have ascertained by the examina- 

 tion of types. The student is requested to insert marginal 

 references in the body of the work wherever such changes 

 or additions should be made. 



Page 25, near middle, for 'maxillae' read mandibles; fourth line from 

 bottom for 'not' read seldom. 



Page 28, third line, strike out remainder of sentence beginning 'and 

 it has been said', and see footnote, page 81. 



Page 35, Mr. Austen urges the abandonment of the term 'metatarsus', 

 and I quite agree with him that the word, as used, is etymologically 

 incorrect. Whether or not distinctive terms for the different tarsal 

 joints are desirable I do not know, but I suggest the following: pro- 

 tarsus, epitarsus, mesotarsus, metatarsus, onychotarsus. 



Page 41, second line from bottom, for 'Cubital 1, 2' read Medial 1, 

 2, 3; next line for 'V3, Cubital 3' read VII 1, 2, Cubital 1, 2. 



Page 42, fig. 16, read Thereva, Therevidse. 



Page 86, last couplet, change to read: 



Antenna? 14-jointed; 15 in Elephantomyia. 

 Antennae 16-jointed; 12 in Toxorhina. 



Page 91, read Tanypremna and Long-uric 



Pages 112, 1 14, first and seventh lines, for i Ablabesimyia\ read Tany- 

 pus; fifth and fourth lines for 'Tuny pus' read Protenthes. Page 114, 

 eighth line, for '/sop/ates', preoc. read Tanypus. These corrections 

 are by Prof. Johannsen. 



Page 140, near middle, for 'three'. read two. 



Page 142, change last two lines to read: Palpi four or five jointed; 

 antennae eight to twelve jointed, etc. 



Page 148, last line, for "facts' read facets. 



Page 155, fifth line, insert twelve to before 'sixteen'. 



Page 162, Misgomyia Coq. (Proc. Ent. Soc. Wash. 1908, 145). Near 

 Arthroceras, four posterior cells; two spurs on hind tibiae. M. obscu- 

 ra Coq.-Va. 



Page 163. An examination of the type of Spatiia edeta in the Brit- 

 ish Museum discloses the fact that it is a true Ptiolina; Spatiia is 

 not known to occur in North America. Footnote on same page, for 

 'Rupellia' read Ruppelia. 



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