116 



FRED. V. THEOBALD. 



striae, one very distinct. Cauda prominent, bluntly acuminate, about half as long 

 as cornicles, pale, with three hairs on each side. Anal plate pale. Femora greenish 

 to almost colourless ; tibiae colourless, apices and tarsi brown. Venter pale yellowish 

 green. Skin roughened, sometimes shiny. Length, 2 mm. 



Nymph. — Green or pinkish ; head pale yellowish-green ; eyes very dark red, 

 stemmata reddish. Antennae with the two basal segments of the same colour as the 

 head ; third and fourth colourless ; fifth colourless, with smoky apex ; sixth smoky. 

 Pronotum pale green, tinged with yellow ; mesonotum very pale yellowish-green ; 

 base of wing-buds very pale, apex pale ochreous or smoky. From the anterior margin 

 of the mesonotum two prominent sub-median darkish green lines continue back to 

 about the middle of the abdomen. Abdomen pale yellowish-green, a median darker 

 green stripe of the same colour on the two submedian lines (fig. 11, B). Cornicles 

 colourless, apex dusky. Femora pale greenish ; tibiae colourless. In some individuals 

 the head and thorax may be yellow and the stripes green, in others the head, thorax 

 and abdomen are pink to salmon pink. 



Fig. 12. Ehopalosiphum lactucellum, sp. n. ; A, head and antenna of alate $; 

 B, cornicle ; C, cauda. D, head and antenna of apterous $ ; E, cornicle. 



Larva. — Head yellowish green ; eyes dark or very deep red. Antennae colourless, 

 with the last segment smoky. Body pale green. Cornicles colourless, with dusky 

 apical ring. Femora faintly greenish ; tibiae colourless ; tarsi dusky. Some larvae 

 are all yellowish in colour, and others which are going to become nymphs are pink at 

 a very early age. They also exhibit the three dorsal green Hnes at an early stage. 



Egypt : Gizeh, ll.iii.l910 {F. C. Willcocks). 



Food-plants. Lettuce (Lactuca) and peach. 



Described from several alate §$, several apterae and nymphae. Colours noted 

 by Mr. Willcocks from live specimens. This insect resembles at first sight Rhopalo- 

 siphum lactucae, but differs in the antennae and in the much thinner cornicles. Mr. 

 Willcocks notes that in general appearance this lettuce aphis resembles one he found 

 in the same locality on peaches, which are probably the alternate plant host. 



Siphocoryne splendens, sp. nov. (fig. 13). 



Apterous viviparous female. — Green and bright dark crimson. Head dusky 

 olivaceous to obscure oHvaceous orange ; in some specimens slightly farinose ; eyes 

 black. Antennae smoky black, pale at the junction of the segments 3 and 4, and 

 4 and 5. Thorax dark olivaceous green or dark green. Abdomen, in front of cornicles 



