LEONARD HASEMAN. 331 



drical terminal portion. Beyond the stalk the tube is rough and 

 heavily charged with black pigment, except a narrow streak on the 

 dorsal surface, which is lighter and bordered on each side witii a 

 row of small, circular papillae. These papillae also surround the tip 

 of the tube and, according to Miall and AValker, are the external 

 openings of the trachea. As can be seen from a side view, the ante- 

 rior end of the pupa is much the heavier, the posterior end tapering 

 to rather an acute point. 



The pupal period seems to vary a great deal. In two instances 

 the adult emerged after a pupal period of two and a half days, while 

 in some cases the pupa persists as such for a week. The moulting 

 and drying of the wings take place in a very short time. The 

 writer has removed all the adults from the jar, and on returning an 

 hour later has found a number of adults flying about in the jar. 

 The pupas vary somewhat in size, but average about 3.75 mm. in 

 length and 1 mm. in breadth. 



The immature stages of the Psychodids are unfortunately too 

 little known. The writer has recently discovered an aquatic larva 

 on the rocks above a waterfall near the University, which he thinks 

 is a Psychodid larva, but is unable to say definitely until it matures. 

 He thinks that the immature stages of other Psychodids can be 

 obtained by means of prepared vegetable cultures and will work to 

 this end during the coming spring and summer. 



Since this has been written Prof. V. L. Kellogg kindly informs 

 the writer that one of his students has just completed, for publica- 

 tion, the life history of one of the western species. 



Acknowledgments. 

 The writer wishes to thank Prof. F. H. Snow and Mr. E. S. 

 Tucker of Kansas University for the loan of specimens; also Prof. 

 J. M. Stedman for helpful suggestions and kindly granting him 

 time for working up this paper; and various other friends who have 

 aided him greatly in this work. 



Note. — Since this paper has been in the hands of the publishers, 

 the descriptions of the following four new species — Ps. quadripunc- 

 tata, Ps. interrupta, Ps. hasalis and Ps. apicalis, by Mr. Nathan 

 Banks — have appeared in the Proc. Ent. Soc. Wash., vol. viii, Nos. 

 3 and 4, p. 148 ; and the writer has secured a second aquatic Psy- 

 chodid in prepared vegetable cultures, which will be described later. 



TBANS. AM. ENT. SOC. XXXIII. NOVEMBEE, 1907. 



