1911] Study of Muscoid Flies 139 



ally illustrate the astonishing amount of such work that yet 

 remains to be done. The above 37 series, as defined or at least 

 mentioned, and including others indicated therewith, will no 

 doubt be more than doubled before the work is brought to a sat- 

 isfactory conclusion. I have at present in tentative outline some 

 91 groups — taxonomic categories which are to be considered of 

 subfamily or tribal rank, perhaps better the latter, and which 

 may be termed group units. But before these can be satis- 

 factorily defined, hundreds of type species of genera must be 

 carefully dissected and figured, as well for their eggs and mag- 

 gots as for the reproductive system. It is now most confidently 

 believed — in fact, it is axiomatically apparent — that this method 

 of work will finally clear up the taxonomy of these flies and put 

 it on a sound basis. 



ADDENDA. 



In order to bring the outline of results up to date of reading 

 proof of the foregoing (April 15, 1911), I wish to add the fol- 

 lowing very brief particulars: 



Calliphorine series — Synthesiomyia belongs here, as shown 

 by dissection of Peruvian material. It was formerly thought 

 to be more closely allied with Musca. 



Mesembrinine series — Dr. Lutz has sent me three speci- 

 mens in fluid of Pseudogametes for dissection, but unfortunately 

 all are males. The fly has a wonderfully strong Oestrid habi- 

 tus, greatly resembling Cuterebra in general form and appear- 

 ance. It will almost certainly need a separate group, the 

 Pseudogametine. 



Sarcophagine series — Sarcophaga auribarbata n. sp., auri- 

 gena n. sp., argenta n. sp. (all Peru) have been dissected and 

 drawn. Sarcophagula peruana n. sp. (Peru) and many other 

 species of several genera (Florida and Peru) have been dissected 

 and the maggots drawn. 



TD 354, from Massachusetts, which is apparently closely 

 related to this group, if not a member of it, is remarkable as 

 showing most clearly in the first-stage maggot the seven main 

 pairs of sclerites of the cephalopharyngeal skeleton enumerated 

 at the end of these addenda, with the single exception of the 

 dorsopharyngeal sclerite which is rudimentary or nearly absent. 



