334 Natural History Bulletin. 



Mesothorax broader than the prothorax, with an entire 

 transverse impressed line anteriorly and two lateral ones, the 

 inner plainer. 



Metathorax resembles the mesothorax. 



Abdominal segments i to 8 with a transverse impressed 

 line at the base, sides margined. 



Antennae situated behind the mandibles, four-jointed the 

 first joint short and stout, the second long and slender, the 

 last two decreasing in length. Bristles wanting. 



Mandibles as in Dineutes. 



Maxillae as in Dmeutes, the palpi proportionately a little 

 shorter. 



Labial palpi also as in Dineutes. 



Abdominal hooks as in Dineutes. 



The pupa somewhat resembles that of Dineutes and is 4 

 mm. in length, white, the antennae projecting at right angles 

 from the sides of the head. The labrum is very distinct and 

 the head has a large prominence on each side just above the 

 antennas. 



As to the method of pupation I find there is a great deal of 

 contradiction among different writers. Letzner^ states that 

 pupation takes place in the leaves of water-plants, reeds, etc., 

 in a cocoon. Schaupp^ says that they "make a gray paper- 

 like cocoon under the bark of old willow-trees, etc.," while 

 Packard-'^ remarks that they "spin an oval cocoon." The 

 discrepancy between these last statements is very marked, my 

 observations going to uphold rather that of Schaupp since the 

 cells I found were of mud without any intermixture of silk and 

 so can hardly be said to have been "spun." Probably the 

 larva uses any readily accessible matter in the formation of its 

 cell and when under stones would use mud, vvhile if under 

 bark might there utilize wood or bark fibre thus giving the 

 "cocoon" a papery consistence. A cell in my possession is 



1 Zeitschrift fuer Entomologie. Breslau, 1S55. p. 4. 



* Bulletin of the Brooklyn Ento. Soc, II, p. 22. 



• Guide to the Study of Insects. 8th edition, p. 437. 



