11 



From the labels on the specimens I uote that the earliest date of capt- 

 ure is April 18, 1890, and the latest April 28, 1890. He informs me by 

 letter that after this date no imagos were captured, though he made 

 several sweepings of the strawberry bed on later dates. This agrees in 

 the main with my own observations as to the date of appearance, period 

 of eo^g-deposition, etc. 



Comparing the reared specimens of M. ignota sent me by Professor 

 Osborn with those I studied last year and those collected by my brother 

 this spring, I find them all to be identical. The venation of the wings 

 of the twenty-two specimens of 21. ignota collected this spring, and 

 which are now before me, could not be more constant, even in minute 

 details. The imagos vary slightly in size, and considerably in the dis- 

 tinctness of the spots on the back of the abdomen. 



I have before me specimens of both sexes of .ff. niaculatus and JI. ignota. 

 As I look at them I note the following differences: Fimtjignota is larger 

 and more robust. Second, the general color of ignotais a shining black, 

 which is equally true of the head and thorax of niaculatus, but the color 

 of the abdomen of the latter is distinctly brown. Third, the spots on 

 the back of the abdomen of niaculatus are more distinct and striking, 

 due to their pure white color, than ignota, in which the spots vary from 

 a light gray to black, in which latter case the abdomen is of a uniform 

 black color. Fourth, the legs of macidatits have much more white than 

 those of ignota. The above-named differences are such as can be read- 

 ily noted by comparison. Except venation of the wings I must say 

 that, so far as I have observed, the color and markings of H. maculatus 

 are quite distinct and constant. 



Reviewing the points brought out by this brief discussion of the life 

 histories of the larvae and imagos in question, we find that the larvie 

 may be separated into two distinct kinds by strong and well marked 

 characters ; that the imagos reared from each kind of larvae are also 

 distinct and constant and can be easily separated by comparison. The 

 only conclusion which I can arrive at from the above given evidence in 

 addition to the details of what has been given at previous times by other 

 authors, is that there are two species of saw-flies attacking the straw- 

 berry. My conclusion at the first was not hastily made, nor was it based 

 solely on the difference in venation of the two species, but rather upon 

 the only true basis, that of a study of the characters and habits of the 

 various stages of their metamorphosis. 



My statement in a former article that the two species could be readily 

 distinguished by noting the difference in venation was made before any- 

 thing had been written concerning the variability of the venation of H. 

 maculatus, and was correct so far as our knowledge of that species went 

 at that time. Since the publication of Mr. Harrington's article I have 

 brought together as many specimens of H. maculatus as possible, so that 

 I might study the venation of that species. I can verify Mr. Harring- 

 ton's claim as to the variability of the same. Twenty-six specimens 



