/O ENTOMOLOGICAL NEWS. [Feb.,'l8 



mentioned material. The most typical form was that shown 

 in Fig. I. The variations occurred in various characters. 



The end hook showed four tyes : Type I (Fig. 2) was long 

 with the first tooth indistinctly separated from it. There were 

 fifty-five specimens of this type. 



Type II (Fig. 3) was short with the first tooth indistinctly 

 separated from it. There were forty-eight specimens of this 

 type. 



Type III (Fig. 4) was long with the first tooth distinctly 

 separated from it. There were five specimens of this type. 



Type IV (Fig. 5) was blunt at the end and occurred six 

 times. 



The number of teeth on the lateral lobe varied from four 

 to ten. The most usual number was six or seven. The varia- 

 tions toward few or many were both rare as is shown by the 

 data: 



Left lobe Right lobe 



Number of teeth 4, 5, 6, 7, 8, 9, 10 4, 5, 6, 7, 8, 9, 10 



Frequency i, 8,40,44,16, o, i o, 7,39,44,18, I, i 



The median lobe varied in shape from nearly straight to 

 very convex (Figs. 6, 7 and 8). The tooth on the front mar- 

 gin was single or double. Fach of these forms varied from 

 rudimentary to pointed. In some cases it was absent. The 

 occurrences were as follows : Median tooth absent in eight 

 cases, single and rudimentary fifty-one cases, single and pointed 

 thirty cases, bifid and rudimentary five cases, bifid and pointed 

 nine cases. 



These variations show that the detailed characters which 

 have been used to differentiate between species cannot be 

 used as absolute criteria, but must be considered with general 

 shape and size of the labia, which remain fairly constant in- 



one species. 







Professor F. T,. Washburn Ceases to Be State Entomologist. 



In order to be enabled to devote all of his time to closely allied 

 economic work in the Agricultural Department of the University of 

 Minnesota, Professor F. L. Washburn, for fifteen years State Entomol- 

 ogist, has asked and obtained the consent of the Board of Regents of 

 the University to drop the State Entomologist work, with its attendant 

 police and quarantine duties, this change to be effective February 6th, 

 1918. 



