28 THE ENTOMOLOGIST. 



female, labelled " Gambia " in the British Museum, which would 

 point to a range nearly as restricted as that of the last species ; 

 this female exactly agrees with Brull6's description in everyway, 

 especially in the red basal segment and the terebral length of 

 twelve millimetres, not only eight as indicated by Tosquinet. 

 The species referred to under the present name by Col. Bingham, 

 (Trans. Zool. Soc. six. 1909, p. 179) from Mount Ruwenzori, is 

 0. gigas, which was at that time mistaken for it in the National 

 Collection. The coloration of O.flavipes is quite distinctive : — 

 Head, thorax, scape and extreme apices of antennae rosy ; the 

 last with only two joints white; mesonotum and metanotum 

 sometimes more or less, but never entirely, nigrescent; abdomen 

 black, with the basal segment entirely red ; legs ferrugineous 

 with the hind femora, tibiae and tarsi black, the basal half of 

 their tibiae and second to fourth tarsal joints very pale flavous ; 

 wings brownish, not at all nigrescent, but with violaceous 

 reflection ; length, female, 25 mm. 



TWO NEW MYRMECOPHILOUS APHIDES from ALGERIA. 

 By Fred. V. Theobald, M.A., F.E.S., Hon. F.R.H.S., &c. 



The two new Aphides described here were taken by Mr. P. 

 A. Buxton and Mr. R. Gurney in ants' nests in Algeria ; one of 

 them was also found with termites. So far only a single aphid 

 has been recorded from the nests of white ants, namely, Termit- 

 aphis circumvallata, Wasmann (Tijdschr. v. Entomol. xlv. 1902, 

 p. 105, pi. 9, fig. 7, a-c*). 



Professor Robert Newstead informs me that he is describing 

 another peculiar form from termite nests in the West Indies. 



One of the two species described here is very marked, and 

 this I have placed in a new genus for which I propose the name 

 Rectinasus. The other comes in the genus Forda, although the 

 adult female presents a somewhat different form to the other 

 known Fordas. The ant hosts are given with the species 

 described. 



Genus Rectinasus, nov. gen. 



Antennae of five segments, long, often over half the length of the 

 body, rather thin, the first and second segments small, of about equal 

 length, third and fifth long, about equal in length, fourth short, 

 slightly longer than the second, the first and second have a short 

 blunt spine, at the apex and base respectively. Eyes small. 

 Proboscis long, from two-thirds the length of the body to a little 

 longer than the body, carried at a marked angle to the body, often 

 nearly at right angles ; acuminate, hairy. Setaceous mandibles and 

 maxillae long. Body segmented. Cornicles absent. Legs rather 

 long and thin, but somewhat thicker in young forms. 



■'- This insect has since been placed in a new family. 



