140 



tion in the size of adults and depth of coloring of the legs was discovered. 

 It was also found that the description of Monostegia obscurata Cress, ap- 

 plied very closely, and accordingly specimens of adults were sent to 

 Mr. E. T. Cresson, Philadelphia. Pa., for comparison and determination. 

 His reply was that "your specimens seem to agree with Selandria ignota 

 Xor. As to S. obscurata, I think on an examination of more abundant 

 material it will prove to be the same as ignota." Also, "I would not 

 like to say that your Selandria is a new species without an examination 

 of a larger series of ignota than we have in our collection." Hence the 

 best that can be done at present is to say that the species is Monostegia 

 ignota (Not.). 



Fig. 23. — a, head of larva of Monostegia ignota (Xor.) ; I and c, front and side view of head of Harpi- 

 phorus maculatus. (Drawn "by the author.) 



As to the geographical distribution of this species, little can be said 

 just now. Among the specimens from which Xorton described If. ignota 

 was one from Illinois, and M. obscurata was described by Cresson from 

 material collected in Colorado. 



The period of greatest abundance of the worms is from about the 25th 

 of April to oth of May, though they begin appearing about the middle 

 of April. Hence most of the worms have hatched before the vines are 

 well in bloom, feed, mature, and again disappear by the last of May, 

 before much fruit has ripened. It will therefore be perfectly safe to apply 

 any of the arsenical poisons, with great efficiency, as early as April 20 

 to 25, and with comparative safety about the 1st of May. 



Of the insect enemies preying upon the worms, Coriscus ferns was 

 found to be very beneficial indeed. Xo parasites have as yet been 

 reared. 



In conclusion, I could not honorably fail to give due credit to and 

 acknowledge the needed guidance and instruction of my kind aud 

 worthy instructor, Prof. Herbert Osborn, without whose suggestions 

 and friendly criticisms of the work while in progress it must have been 

 less accurate and complete. To Prof. F. M. Webster for "genuine H. 

 maculatus larvae," and to Mr. E. T. Cresson for determination of speci- 

 mens sent him, 1 wish to tender my sincere thanks. 



