and of several Brachycerous faniilics in Diptcm. 289 



labial, as I find atrophying blades of the maxillaa at 

 their bases. In my paper on the mouth parts of the 

 " Nemocera," published in the "Journal of the Royal 

 Microscopical Society" in 1904,1 described them as labial 

 as my preparations showed no maxillae, but my dissections 

 lately made have been more successful, and enable me to 

 say that the lacinia or blade of this insect is 85 /ix. or 

 a^jj- inch long, and I submit that it is as easy to overlook, 

 as it is difficult to dissect, objects of this size. 



It will thus be seen that I have found a striking affinity 

 between these three families in the mouth parts, which 

 show that the true place of Phora is among the older 

 families of the Brachycera. 



In the Phoridse the palpi in the limited number of 

 species I have examined are labial. This point I very 

 carefully studied, as the palpi being maxillary in Lcptis 

 and Lonclioptcra made me suspect that I was wrong in 

 describing them as labial, though perhaps this has little 

 bearing on the matter, if it be remembered that Bibio and 

 Chironomus differ in this respect. 



The palpi are very large, and bear a number of the 

 characteristic Phorid bristles ; at their bases are many 

 wrinkles, scarcely annulations, and in one preparation, 

 Fhora concinna, Mg., they are two-jointed. This is not, 

 however, the only Nematocerous character; in T. aterrima 

 the palpi bear the sense organ, found on the second joint 

 in the Mycetophilidte, Bibionidfe, Simulida? and Rhyphidse. 

 This I have thought to be an olfactory organ and I have 

 figured it as such, as it is found on the palpi of Bibio 

 hortulanus, L* 



9. 21ic genitalia (male). The hypopygium is free and 

 is joined to the abdomen by a membrane ; it is furnished 

 with representatives of the usual paired organs. In P. 

 incrassata these are hairy bulbs much closer in function 

 and appearance to the cerci of Periplaneta than to the 

 usual hooks or forceps of Diptcra. In another species, 

 P. concinna, Mg., only a single hairy organ, with a trans- 

 verse suture, placed on an asymmetrical platform, is present. 

 In T. aterrima two minute hairy bulbs are present. The 

 part that supports these organs and the anus, is in a more 

 dorsal position and is separated by a suture from another 

 lower part. This lower part seems to be formed of the 



* Some new sense organs in Diptera. " Jour. Quekett Micr. 

 Club," ser. 2, vol. ix, Plate VII, 1904. 



TRANS. ENT. SOC. LOND. 1908. — PART II. (SEPT.) 19 



