48 



ENTOMOLOGICAL NEWS. 



[February, 



lying just between the strongly haired clavate processes shown 

 in the figures. In the examination of nearly one hundred speci- 

 mens (killed by various killing reagents and preserved in alco- 

 hol) I find no trace of any anal tracheal gills as described by 

 Muller for the Brazilian larvae. But Muller expresslj'^ states 

 that these gills can be retracted (are always retracted in fact 

 when the larva is above the water), it is possible that my 

 larvae are provided with them. If so they must be very small 

 and delicate, for they have escaped my observation and numer- 

 ous dissections. -'"^ 



The pupae (Fig. 2, A) are found in the same places with the 



Pupa Pericoma californica Kincaid. 

 A, dorsal aspect ; B. piolhoracic breathing tube. 



larvae, although usually a little higher on the rocks and are 

 thus less wetted. They are broadly shield-shaped, flat and 

 adherent, quite of the general character of Rlepharocerid pupae, 

 but less convex and of course much smaller. They are 2.5 mm. 

 long and 2 mm. wide at the middle. They have a pair of short 

 clavate prothoric breathing tubes. These organs are not com- 

 posed of several lamellae, as with the Blephoroceridae, but are 

 single, sub-cylindrical and have a fine mesh-work covering 



* I shall have opportunity to see living larvje again next March, this 

 point can be settled then. 



