PLATE IV. 
SiPHONOPHOEA EOSiE and Aphtdius cancellatus. 
(Page 111.) 
Fig. I. — Young of A. rosce as it appeared immediately 
after its birth, August 9th, 
Fig. 2. — Shining skin of a living larva of the same 
species which contains a parasite. The dorsum has 
commenced to swell and to show a pseudo-plating or 
segmentation. 
Fig. 3. — Chitinous shell of an Aphis larva, after the 
escape of an Aphidius. The operculum often is found 
near the shell. 
Fig. 4. — Imago of an Aphidius which, on August 26th, 
was bred from the above larva, and had issued from 
the aperture in its back. 
As this insect appears to be undescribed, I give the 
following characters : 
Head globose. 3 stemmata on the occiput. An- 
tennse long, with 17 joints. Palpi 3-jointed. Thorax 
fine yellow, with a large brown patch between the 
wings, followed by 3 bars. Abdomen fusiform, and 
attached by a fine pedicle, yellow, with four or five 
brown dorsal spots. Tarsi 5-jointed. Wings with 
a large triangular closed costal cell, and one large 
nervure. 
Fig. 5, — The larva of a Syrphus which has just 
seized an Aphis, in order to suck out its contents. 
