34 



CALIFORNIA ACADEMY OF SCIENCES 



[Proc. 4th Ser. 



Type. — Cal. Acad. Sci. No. 46090, collected at San Jose del 

 Cabo, Lower California, Mexico, by J. R. Slevin, July 31, 1919. 



Distribution. — The Cape Region of Lower California. 



Remarks. — These two subspecies seem to be alike in all im- 

 portant characters, except the one mentioned. This difference 

 is not a constant one, but exists in so large a proportion of the 

 specimens that it seems best to recognize it by name. The fol- 

 lowing table shows the number of specimens which have each 

 number of granules at the point where there are fewest on each 

 side of the head : 



It will be seen that these granules are 1-1 in 78% of the 351 

 specimens of D. dorsalis lucasensis as against 10% of 206 speci- 

 mens of D. dorsalis dorsalis, and are 2-2 in 15% of the speci- 

 mens of D. dorsalis lucasensis as against 83% of those of D. 

 dorsalis dorsalis. 



