STOMAPHIS. 61 



Taken plentifully late in December by F. Fitch, Esq., 

 on exposed oak stumps at Maldon, Essex. Though 30 

 numerous, no apterous forms could then be found, 

 probably they were preparing to give birth to the 

 perfect sexes, which would furnish the eggs for the 

 next year's progeny. 



This insect is not very unlike the winged form of 

 Lachnus picece, but it is much larger. The food of the 

 two insects is different. It has considerable resem- 

 blance to the fine American species described by Prof. 

 T. Monell,of the Missouri Botanical Gardens, St. Louis, 

 and which he names Lachnus longistigma. This last 

 insect has, however, the stigma continued round the 

 greater part of the stigmatic cell, as a brown border, 

 which certainly is not seen in the British insect. 



Passerini in his diagnosis of Pterochlorus longipeSi 

 says, " Alge stigmate trapezoideo," which hardly agrees 

 with the insects I have seen. He also says that L. 

 longipes affects the sweet chestnut Castanea vesca, as 

 well as Quercus rohur and other kinds of oak. He 

 gives a caution that it is not to be confounded with 

 Aphis roboris of Linngeus, which does not occur in 

 Italy. 



Dufour's description answers well to the above 

 diagnosis, except as to the words " Alis maculis duabus 

 magnis atris subfenestratis," which might possibly 

 apply to the stigmata. . 



Genus XXI.— STOMAPHIS,* Walhr. 



Head and eyes small. Antennae slender, moderately 

 long, six- jointed, third joint the longest, the sixth as 

 long as or longer than either the fourth or fifth, the 

 aborted seventh joint longer than in Lachnus. Cor- 

 nicles very inconspicuous. Legs shorter than in 

 Lachnus^ and less stout. Tarsus biarticulate. Tail 



* From a-Tofia, a mouth, and afig. 



