D. B. CASTEEL AND E. F. PHILLIPS. 



tent of the abnormality is expressed roughly in the terms, very 

 small (vs), small (s), almost complete (ac) and complete (c). 

 The letters used to designate these abnormalities are in no way 

 connected with the naming of the normal veins, but are chosen 

 merely as a convenient means of marking the irregularities. It 

 will be understood that it is impossible to draw at all times the 

 same line between, for example, the terms small and very small, 



FIG. 4. 



and the table is of no value except to give an idea of the number 

 of cases of abnormalities. 



MALES. 



a. 82 b, 32 vs, 109 s, I ac, 2 irregular. 



b. 7 s, I double s, 4 ac, 6 c. 



c. 3 vs, 18 s, 2 ac, 13 c, 2 irregular. 



d. lib, 27 s, I double s, 7 ac, 2 c. 



e. 9 s, I ac, 5 c. 



f, g. 8 irregular at anterior end. 

 h. 5 s, 2 c, I very irregular. 

 i. none. 

 Other irregularities, 14. 



FEMALES. 

 2 b. 



2 b. 



I b, 3 TS, 4 s. 



3 b, 6 vs, 9 s. 

 I b, I vs, 3 s. 



2 irregular at anterior end. 



none. 



2 lost veins ; I almost lost. 



none. 



Deducting the cases where more than one irregularity occurs 

 on one wing we have 271 irregular drone wings and 37 worker 

 wings. Leaving out of consideration those cases in which merely 

 a bend is recorded there are 206 irregular drone wings and 30 

 irregular worker wings or almost seven times as many for drones 

 as for workers. 



The figure and these tabulations make clear what has been 

 said previously about an area of irregularity in the wing. This 

 region is rather well defined and no irregularities in venation were 

 seen outside it. 



A point which may well be recorded is that none of these veins 



