174 DESCRIPTION OF A NEW GENUS OF DIPTEROUS INSECTS, 



of existence from the emergence to the imago state is equally 

 uncertain, as the following table will show ; but it is not im- 

 probable that the seasonal differences of temperature, and the 

 necessarily artificial conditions under which their hosts lived 

 in continement may have had something to do with the latter. 



* One puparium was opened on September 4th in order to obtain the pupa for descriptive purposes. 



N.B. — In rearing the larvae I have followed the course adopted 

 by Mr. Krefft, of placing the frog in a glass vessel provided with 

 damp moss and earth. 



Batrachomyia, gen. nov. (W. S. Macleay, MSS.) 



Head transverse, as broad as tbe thorax ; vertex with a very 

 few short bristles; front flattened; face oVdique. Eyes rather 

 rounded, but higher than broad. Antennae very short, not 

 reaching the epistoma ; third joint twice the length of the 

 second, nearly round, a little emarginate at the base ; sixth 

 slender, bare (pi. x., fig. 10). Thorax rather longer 

 than broad, with a few short lateral bristles ; transverse 

 suture distinct at each side; scutellum rather small, semi- 

 circular, rounded at the corners, fringed with short bristles. 

 Abdomen ovate, five-segmented ; first segment large, as long as 

 the three next following ; last two segments and anal joint much 

 narrower than the preceding segments, curved downwards. Legs 



