The Mouth-parts of the Nemocem. By W. JVesche". L5 



lists endorses this; but this lias come about by the consideration 

 of another character, the wide separation of the eves in both sexes. 

 As the teeth are very strongly developed in all the Caenosinaj 

 I have examined, there seems a correlation in the two characters 

 (plate IV. fig. 62). 



The processes on the labium of Seoptera uibrans L. described in 

 1904, have also been observed in Pteropwctria nigrina M>. 2, 

 Acidia lychnidis F '. $ and Geroocys pictus Mg. £ $. 



The very curious paraglossse of Seoptera are noteworthy; the 

 cleft in the median line has disappeared, and the paraglossia are 

 fused together. This suggests that the whole tropin are a laie 

 development, which does not help to any solution of the problem 

 as to whence these processes are derived. 



The very minute Chloropid, Oscinis pusilla Mg. which is but 

 little over a millimetre in length, has very well marked remains of 

 maxillary palpi, the ends of the stipites being thickly haired. An 

 undetermined species of the same genus from Xew Zealand also 

 has the same character. Other genera such as Ghlorops, have in 

 0. tccniopm Mg. the stipites with a very faint pubescence or as in 

 Meromyza, M. nigrirenlis Mcq. and M. laeta Mg. quite bald. 



As regards the Muscid family, these remnants when present 

 can sometimes be seen with § in. objectives, but more often a }. in. 

 will be required with good substage illumination, for a satisfactory 

 view. 



Group 6. — In the Psilidse, the tropin of Loxocera cdbiseta 

 Schrank have been examined and dissected, and conform to the 

 type of this group ; the maxillse resemble those of Ccelopa frigida 

 figured in the 1904 paper, but have a chitinous process branching 

 off at right angles from the middle of the stipes; a condition 

 similar to that which I have found in some Ephydrida?. 



L. cdbiseta has remarkably long antennae, and is a fairly common 

 insect, found stationary on herbage or hedges. It appears to feed 

 on the juices of flowers, but I have no definite record of observa- 

 tions on this point. 



Group 7. — In a number of Hydrellia that I collected at 

 Geelong, Australia, I have found the complete maxilla, nearly 

 exactly similar to that in //. griseola Fin. of our English fauna. 

 These insects are very close to our form, and whether they have 

 been introduced or not must remain an open question; but the 

 observation is of interest as it implies the very possible wide 

 distribution, characteristic of archaic forms, and agrees with the 

 general character of the Australian fauna, which is often of ancient 

 type. Since writing the above, I have mounted and examined a 

 Hydrellia which I captured in New Zealand, and which also has 

 similar maxilla-. 



