972 The American Naturalist. [October, 
egg in a case observed was deposited obliquely in the pith of the stem 
of horse-weed (Ambrosia trifida). ‘The outer fibres are first gnawed 
away to allow the insertion of the ovipositor. The egg is 2 mm. long 
by 0.3 mm. wide, elongate-oval, slightly curved, and pale yellow in 
color. 
Lire-HistoRY OF EVENING PRIMROSE CuRCULIO.—The common 
borer of the evening primrose has been studied with some care by Dr. 
Weed, who reported finding a freshly-emerged adult Zyloderma foveo- 
latus in an Oenothera stem, July 22, 1890. This was early, as the 
main brood develops during August and September. The beetle hiber- 
nates in the adult state, the sexes mating early in June. The full- 
grown larva is 8 mm. long by 2.5 mm. wide, the body, including the 
thin cervical shield, being white in color, while the head is light brown. 
The pupa is 7 mm. long, white, and of the normal curculionid form. 
Pupation takes place in the larval burrow within the stem. Besides 
Oenothera biennis, the insect develops in Epilobium coloratum. It is 
attacked by an external parasite, a species of Bracon. 
LirE-History or Lixus concavus.—Dr. Weed also reported 
rearing Zixus concavus in numbers from the stems of a common dock 
(Rumex crispus). The larva bores the stem and upper portion of the 
root, pupating about midsummer, and soon after emerging as a beetle. 
The larva is attacked by an external Braconid parasite. * 
OFFICERS ELECTED.—The following officers were elected by the 
Entomological Club for the ensuing year: President, Professor Herbert 
Osborn; Vice President, Miss Mary E. Murdfeldt; Secretary, Dr. 
C. M. Weed. 
Crayon Drawing for Photo-Engraving.—The editor of this 
department has received so many queries concerning the methods and 
materials employed in preparing the drawings that have lately appeared 
in the Bulletin of the Ohio Experiment Station, and also in this depart- 
ment of the NaTURALIST, that Miss Freda Detmers, by whom they 
were made, was requested to furnish a brief statement of the main 
points involved. She has kindly done so, with the following result: 
** The materials to be used are (1) ordinary bristol board or other stiff 
white paper ; (2) a hard drawing pencil, a 5 H. Faber does very well ; 
(3) a good quality of tracing paper, oiled on both sides ; (4) a supply 
of different grades of the Ross special process stipple drawing paper; 
(5) Faber's black wax crayon pencils, No. 41; (6) a good black India 
drawing ink, such as Higgins's water-proof American India ink; (7) 
Gillott's lithographic crow-quill pens, No. 659. Having these materials, 
