282 



ENTOMOLOGICAL NEWS. 



[June, '08 



LARVA. 



The lame are extremely sluggish and have the habit of roll- 

 ing themselves up in the decaying material and feigning death 

 when disturbed. They are not nearly so greedy as the other 

 forms, though they feed almost continuously. Occasionally 

 they leave the culture and climb up along the sides of the ves- 

 sel by carrying along with them a film of water. Specimens 

 have often escaped from my watch-glasses and crawled about 

 on the table until quite dry, but on replacing them in the glasses 

 they would revive. 



FIG. 2. Dorsal and ventral view of larvae and ventral view of pupa, 

 Ps. domestica, n. sp. (X. 20). 



The larvae attain a length of from 6 to 7 mm. and a breadth 

 of .8 mm., and are slightly flattened. The thoracic segments 

 and the first abdominal have each two distinct annuli, while the 

 next six abdominal segments have each three. Each annulus, 

 with the exception of those of the first abdominal segment, 

 bears a distinct plate on its dorsal surface. There is some 

 variation in the dorsal plates on the first three abdominal seg- 

 ments, and they are usually much reduced, though, as a rule, 

 each annulus of the second and third segment bears a small 



