June, '04] ENTOMOLOGICAL NEWS. 193 



one, the case being reduced to a mere shell, the larvae filling the whole 

 of it ; lost. After this, several younger and much smaller larvae were 

 found. 



June 241)1 Larvae, a single egg, and adults found to-day ; pupae per- 

 haps also present. The last adult observed. Attempts to obtain pupae 

 a failure. 



Annapolis, Md., 1901. 



May yth Cases and eggs abundant, also adults; cases measure 

 about 5 mm. 



May 2oth Larva obtained from cases in stage. 



May 3oth Oviposition continues ; fresh eggs present. Find great 

 difficulty in attempts to rear. Very young larva; present ; no pupae 

 obtained. 



The egg is probably laid before the case is rolled up, although one 

 examined when partially rolled and under construction yielded no egg. 

 ( Q. rubra ?} 



Credit is due Mr. John F. Strauss, Washington, D. C., fur the rough 

 draft of the figure, and to Mr. J. Francis Linthicutn, Annapolis, Md., 

 for recopying. 



Relation of the Systematic to the Economic 

 Entomologist. 



BY F. M. WEBSTER, Urbana, 111. 



I go to my farm in spring, and my tenant points out to me 

 a young colt frisking about beside its mother. Five or six 

 years after I observe him working a horse in harness at the 

 plow, and I ask him where he obtained his horse ; and he tells 

 me that it is the colt that I saw besides its mother some years 

 before, except that it has now developed to a horse. I ask 

 him when the colt ceased to be a colt and became a horse, and 

 he cannot tell me, though he has probably cared for it and 

 watched over it nearly every day since its birth ; yet, despite 

 all of this, he cannot give me the exact date when the colt 

 became the horse. He has given me an honest answer, and I 

 do not think less of him for having done so. 



My children grow up to manhood and womanhood, and I ask 

 the mother when they ceased to be boys and girls and became 

 men and women, but she can not tell me. We know that, 

 legally, they reached maturity at 21 and 18 years of age, but 

 we also know that some children are more mature at the age 



