108 MAUD D. HAVILAND 
front, and a posterior commissure passing beneath the gut, in 
the eleventh segment, behind. Simple dorso-lateral, and 
ventro-lateral, branches are given off in segments 1, 83-8. When 
newly hatched there are only two pairs of open spiracles, the 
first between the first and second segments, and the second on 
the anterior part of the fourth, but the spiracles of the third 
and fifth segments open shortly afterwards. (See ‘ Moults’.) 
Seurat (26, p. 100) states that the young larva of the Chaleid, 
Torymus propinquis, has likewise four open spiracles, 
but situated on the first, fourth, fifth, and sixth segments. 
This stage lasts from twenty to twenty-four hours. 
SECOND StTaGE LARVA. 
Dimensions -70 x -35 mm. 
The second stage larva differs from the first chiefly in the 
tracheal system, and in the greater development of the anterior 
TEXT-FIG. 4. 
The larva of the second instar, showing tracheal system. x 200. 
part of the body in proportion to the head, so that the latter 
appears constricted off from the thorax, and the body resembles 
