No. 34.] HEMIPTERA OF CONNECTICUT: APHIDIDAE. 257 



7. Wings with median vein normally two-branched Dilachnus, p. 260 



Wings with median vein once branched Lachniella, p. 268 



8. Needle-feeding species having the body covered with white floccu- 



lence. Hairs on body and legs fine setaceous 9 



Needle-feeding species not covered with white flocculence. Hairs 

 on body strongly spine-like 10 



9. Median vein of front wing with a single fork . . Schizolachnus, p. 269 

 Median vein of front wing simple Unilachnus, p. 269 



10. Antennae with six segments Eulachnus, p. 270 



Antennae with five segments Essigella, p. 271 



Longistigma Wilson. 



L. caryae (Harris). Lachnus caryae Harris. L. longistigma 

 Monell. (PL vii, i.) 



Ins. Inj. Veg., 190, 1841. 



This large and interesting species does not require a detailed 

 description for its identification as the peculiar long, slender stigma 

 is sufficient to separate it from all other known species. The body 

 is covered with bluish white pruinose and the dorsum of both 

 apterous and alate forms have a regular pattern of black markings. 

 It is a bark feeder. 



Apterous viviparous female: General color ash-gray with two 

 triangular black spots on the pronotum and one quadrangular 

 spot on the mesonotum. Abdomen with two rows of rather large 

 black spots down the center of the abdomen, a row of smaller 

 black spots outside of these and another row of larger spots along 

 each side of the abdomen. Legs reddish brown with black joints. 

 Length of body about six millimeters. 



Alate viviparous female : General color ash-gray, the head and 

 thorax dull black. Abdomen as in the apterous forms. The 

 stigma is long and slender and is drawn out into a long and slender 

 curving point which extends partly around the end of the wing. 



Food Plants : Acer saccharinum, Carya alba, C. cordiformis, 

 C. glabra, Juglans nigra, Platanus occidentalis, Populus sp., 

 Quercus marilandica, Tilia americana, T. cordata. 



On pin oak, Hartford, 19 Oct., 1909 (G. H. H.) ; on linden, New Canaan, 

 21 Sept., 1909 (A. I. B.) ; oak, Bridgeport, 8 Sept., 1910; pin oak, Ridge- 

 field, 29 Aug., 1912 (J. Ballantyne) ; chestnut, Hamden, 21 Oct., 1910 

 (E. M. Stoddard) ; oak, Thompson, 16 June, 1914 (R. Barton) ; 16 Aug., 

 1918 (W. E. B.) ; New Haven, 19 June, 1910 (A. B, C.) ; elm, Wallingford, 

 19 Oct., 1915 (Alfred Curtiss). 



Tuberolachnus Mordwilko. 



T. punctatus (Burmeister).* 



Handb. der Ent., ii, 93, 1835. 



Because of its size and the prominent tubercle on the dorsum a 

 general description of this species is sufficient to place it with ease. 



* This is the species known in Europe as Lachnus viminalis and in 

 America as L. dentatus. 



The writer is preparing a monograph of this group which is nearly ready 

 for publication which will explain the use of this name. 



9 



