NEW BREEDING RECORDS OF COFFEE-BEAN WEEVIL, 63 



NOTES ON LIFE HISTORY IN CORN. 



fludging from tho appeaiance of damaged stalks when split open, 

 the larva? evidently begin work at a joint and form wide cavities, 

 mainly in a crosswise direction, as the\^ progress into the pith. All 

 examples of their injuries showed that irregular portions of the pithy 

 substance, excepting most of the fibers, had been reduced to a dis- 

 colored, powdery condition, which was usually more pronounced 

 above the joint than below it. The greater part of the time neces- 

 sary for the growth of the grubs is probably spent in the exca- 

 vation of these spaces to satisfy their demands upon the pith as 

 a food suppl}". In preparation for the pupal stage the grown or 

 nearly grown larvae manifest a tendency to burrow into fresh pith 

 some distance from the area of early operations. A considerable 

 proportion of them does this; though few grubs proceed farther than 

 2 inches upward or downward. These burrows run in somewhat 

 deflective courses, but when finished always terminate just under 

 the hard surface of the stem and afford a convenient position at the 

 far end for each insect upon attaining maturity to gnaw its way out, 

 as was proved in many cases by an emergence hole being already 

 cut to afford means of escape to the tenant. Nearly every closed 

 burrow contained either a grown larva, a pupa, or an adult. These 

 stages common!}' occurred also in or close to the large primary 

 cavities, indicating that not all the larvae undertake special meas- 

 ures for pupation away from their original place of development, 

 though all apparently provide for facility of emergence as adults, and 

 the greater number perhaps complete their transformations in the 

 same relative position. In fact, the greater number of openings ap- 

 jjearing through the surface immediately surrounding the worst 

 damaged places close to the joints shows that emergence is most 

 frequently effected there. 



OCCURRENCE IN CHINABERRIES; PARASITES. 



The further records on the habits of Arsecerus fasciculatuf! are 

 obtained from the notes on file at the laboratory of the Bureau of 

 Entomology at Dallas, Tex., all of wliicii pertain to the breeding of 

 the species in berries of the chinaberry tree (Melia azedarach). Sev- 

 eral larvie and ])upa? and one adult were found in the pulp of old 

 chinaberries collected at Victoria, Tex., April 24, 1!)07, by j\Ir. R. A. 

 Cushman. From other collections of similarly infested berries, made 

 at the same place on May 12, by Mr. A. C. Morgan, adult weevils 

 first emerged seven days later, and on the 27th and 2Sth of the same 

 month the first rearings of parasites were recorded. These para- 

 sites represented a species which was later described by Mr. J. C. 

 Crawford as Cemmhycohius cushmam, and further <leveloi)ments not 

 only provetl it to be the most important enemy of Arsucerus fascicu- 



