112 THE CANA.UIA.N KNTOMOLOGIST. 



Pulex Ilowardii, n. sp, 



I have received specimens ot" this species as follows : On Red 

 Squirrel, at Ithaca, N. Y., from Mr. R. H. Pettit ; on Squirrel, at I'allula 

 Falls, Ga., from Mr. L. O. Howard (No. 5435); on "Gray or Fox"' 

 Squirrel, and in nest of field mouse, at Lincoln, Nebraska, from Prof 

 Lawrence Bruner ; also several specimens from Prof Herbert Osborn, at 

 Ames, Iowa, the host not given. 



Pulex coloradensis, n. sp. 



The nearly parallel upper and lower borders of the abdomen in the 

 single male before me, give it a somewhat peculiar appearance. It was 

 taken from Fremont's Chickaree, at Georgetown, Colo , by Professor 

 Lawrence Bruner. 



Pulex ignotuSy n. sp. 



I have received two specimens of this species from Prof Herbert 

 Osborn, of Ames, Iowa. The host is not given. 



[to 1!e continued.] 



MOUNTING INSECTS WITHOUT PRESSURE.* 



BY R. W. RENNIE, LONDON, ONTARIO. 



The mounting of insects (which are naturally semi-transparent) with- 

 out pressure has always appeared to me to be a far more satisfactory 

 method than the process so generally in use, viz., the soaking the specimen 

 in liquor potassse until clear, and then pressing it flat between two glass 

 slips. The liquid partially, or wholly, destroys the internal organs, 

 and the flattening process completes what the liquid failed to accomplish ; 

 that is, in so distorting the insect that the flattened skin on the slip but 

 very remotely resembles the natural insect. 



In mounting without pressure, some kind of a cell is necessary, and 

 it can be obtained in various materials, such as ebonite, hard rubber, 

 brass, tin, etc., but my own experience with cells of any depth cemented 

 to the slip has been anything but satisfactory, for very often a fall, or even 

 a slight jar, will separate the cell from the glass slip. 



The cells that I use are the same that I described some three years 

 ago at a meeting of this section, and up to the present time I have not 

 found anything that answers all requirements so well, and yet is so easy 

 to construct. 



Read before the Microscopical Section of the Entomological Society of Ontario. 



