. Bulletin of the Department of Agriculture. Agriculture. SACBROOD. 9 while its extreme anterior or cephalic end extends ahnost to the cap and roof. The length of the larva is approximately one-half inch, being nearly that of the cell. Its two lateral sides cover about one- half each of the two lateral walls. The width of the larva is approxi- mately one-fifth of an inch, being the distance between the two lateral walls of the cell. The dorsal portion of the larva lies against the floor of the cell, being more or less convex from side to side and also from end to end. Its ventral surface
. Bulletin of the Department of Agriculture. Agriculture. SACBROOD. 9 while its extreme anterior or cephalic end extends ahnost to the cap and roof. The length of the larva is approximately one-half inch, being nearly that of the cell. Its two lateral sides cover about one- half each of the two lateral walls. The width of the larva is approxi- mately one-fifth of an inch, being the distance between the two lateral walls of the cell. The dorsal portion of the larva lies against the floor of the cell, being more or less convex from side to side and also from end to end. Its ventral surface is convex from side to side, and is, generally speak- ing, concave from end to end. Considerable empty space is found between the larva and the roof of the cell. The spiracles are visible. The ghstening appearance, characteristic of a larva before capping, very largely disappears after capping. Although larvae at this age might be thought of as white, they are in fact more or less bluish white in color. It is possible to remove a healthy larva at this age from the ceU without rupturing the body wall, but care is required in doing so. For pm'poses of description it is con- venient to divide the length of the larva into three parts. These may be denom- inated the anterior (AT), middle (MT), and posterior tliirds (PT). Anterior third.—On removing the cap from a cell the anterior cone-shaped portion of the larva is seen (fig. 5; PL II, g). The apex of this cone-shaped third is directed upward toward the angle in the roof of the cell, but is not in contact with the roof or the cap. Transverse segmental markings are to be seen. Along a por- tion of the median dorsal line there is frequently to be observed a narrow transparent area. A cross section of this third is circular in outline. The anterior third passes rather abruptly into the middle third. At their juncture on each lateral side, owing to a rapid increase in the width of the larva at this point, there is presented the appea
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
