THE GBAIN BUG. 
73 
visable to allow mesquite to grow in the vicinity of cotton when it can 
be avoided. Observations thus far on the feeding habits of the con- 
chuela have given us no reason to expect that a trap crop can ever 
be successfully used to divert the attention of the insect from the 
cotton after the bolls become suitable for food. 
Under date of May 29, 1906, Mr. J. II. Vaughan, of Tlahualilo, 
Mexico, in a communication to the writer stated that the conchuela 
had already appeared on alfalfa. This directs attention to the advis- 
ability of giving close attention to this crop and of taking advantage 
of its attractiveness as a breeding place for the conchuela early in the 
season, to check 
its increase 
through means 
that have been 
suggested. 
The adult con- 
chuela evidently 
never flies except 
during daylight. 
Many Pent a - 
tomids are com- 
monly attracted 
to lights, but nor- 
mally this species 
feeds almost con- 
tinually at night, 
and in the labora- 
tory either re- 
mains motion- 
less, if not feed- 
ing, or, if feeding, 
continues uninterruptedly when an electric light is brought within a 
fewfeetof a cage in which specimens are confined. 
THE GRAIN BUG. 
(Pentatoma sayi St&l.) 
At Tlahualilo, Durango, Mexico, the grain bug (tigs. 10, 11") lias 
been observed to be of frequent occurrence on cotton and to resemble 
the conchuela in its habits, life history, and seasonal history. At 
Barstow, Tex., where grain crops were accessible, no specimens 
were collected on cotton." The preference of this species for the seed 
of grains and of alfalfa will probably be sufficient protection against 
its occurring in injurious abundance in cotton fields in this country. 
" Bui. 64, Pt. I, Bur. Ent., U. S. Dept, Agr., p. 2, I 
Fig. 11.— The grain buj 
Nymph, fifth instar. 
(Original.) 
Enlarged 6 diameters. 
