1910] Timberlake — Aphidiine Parasites of Aphids 129 
preceding segment, tipped with a few short hairs, and a pair of ventral 
appendages much more delicate, only about half as long as the dorsal 
appendage. The metathoracic and first to ninth abdominal segments pro- 
vided with a comb of comparatively coarse bristles along their posterior 

Fig. 1. Praon simulans Proy. 1, First Stage Larva; 2, Second Stage 
Larva; 3, Third Stage Larva. 
margins; the comb extending nearly to lateral-ventral margins on the pos- 
terior, but becoming more and more dorsal on the anterior segments. 
Mouth-parts not prominent, though a pair of small but sharp and chitinized 
mandibles may be made out. Length .8 mm. 
SEconp Srace Larva: Like the ordinary hymenopterous larva. Body 
13-segmented (owing to the fusion of the last two abdominal segments), 
tapering but little at both ends. Last segment broadly rounded, somewhat 
indented at the tip. Head small, mouth-parts appearing as fleshy folds. 
Integument of body delicate and smooth. 
Txirp STAGE Larva: Resembles the preceding stage, but tapers more at 
the anterior end. Head small, the mouth-parts represented by folds with 
chitinous plates, not at all prominent. Integument rather thick and 
chitinous, thrown into large folds along lateral margins of body, every- 
where roughened by fine granulations. Length nearly 2 mm. 
2. Aphidius rosae Hal. (?). 
First Stace Larva: Body 14-segmented, rather broad anteriorly and 
somewhat depressed, tapering gradually behind, the last segments rather 
deeply constricted, especially anteriorly. The head provided with a pair of 
projecting lobes on its posterior ventral margin on either side. Mouth-parts 
represented by a pair of comparatively long, curved mandibles, tipped with 
a yellowish spot, and prominent when protruded. Body smooth, free from 
hairs or bristles. Length .8 mm. 
