August, '17] BAKER: EASTERN APHIDS, PART II 425 



Genus Euceraphis Walker 



Euceraphis hetulcc (Koch). Taken on Japanese maple, Hartford, 

 Conn. Sept. 11, 1905, by C. N. Ruedlinger, Conn. No. 1-16/145. 



This species may be distinguished by the black marking upon 

 the abdomen, the wax pores, the color of the legs and the proportions 

 of the antennal segments and the width of the head. 



The abdomen of the alate vivipara is marked with a large quadrate 

 more or less broken dark brown patch. Within this patch there are 

 lighter somewhat oval areas which constitute the wax plates. These 

 areas are composed of small circular pores very variable in number 

 in the different plates. The hind tibice are light in color with the distal 

 extremities and tarsi black. The antennal segments measure as 

 follows: III about 1.456 mm.; IV, 1.008 mm.; V, 0.8 mm.; VI (0.256 

 + 0.256 mm.). The head is about 0.6 mm. in width across the eyes. 



Dr. Fitch described a member of the present genus under the name 

 of Aphis cerasicolens. (1851, p. 65.) The type of this species is not 

 in good condition. It was mounted from the Fitch collection by INIr. 

 Theo. Pergande. As far as the wiiter is able to tell from an examina- 

 tion of the specimen this name is a synonym of betula\ 



Euceraphis )nucidus (Fitch). (1856, p. 334.) Taken on black 

 birch, New Haven, Conn., July 1913. Conn. No. 1-16/19. 



The writer has examined the specimens of this species from the 

 Fitch collection and compared them carefully with the Connecticut 

 material and specimens from other regions. He is thus able to give a 

 positive determination. 



Alate Viviparous Female. Morphological Characters: Antenn£e about as follows 

 though somewhat longer or shorter in larger or smaller specimens. Segment III, 

 1.984 mm.; IV, 1.408 mm.; V, 1056 mm.; VI (0.448 mm. + 0.384 mm.). • Segment 

 armed with a few short, stiff, spine-like hairs. Segment III, with about 30 narrow 

 oblong transverse sensoria upon the basal half of the segment. The extreme basal 

 portion is without sensoria and that part which is covered with sensoria is somewhat 

 swollen. Distal segments rather strongly imbricated; width of the liead across the 

 ej-es about 0.64 mm. ; vertex with a few short spine-Uke hairs and somewhat projecting 

 forward to the median oceUus but without tubercles or projecting areas above. 

 Cornicles nearly 0.16 mm. long and about 0.117 mm. broad at the base. Anal plate 

 slightly notched; tibia> very thickly covered with minute subcircular pore-Uke areas 

 which are hardly as large as the tubercles forming the bases of the hairs on these 

 segments. Dorsum of abdomen without apparent wax gland areas. Length from 

 vertex to tip of cauda 2.88 mm. 



Color Characters: Antennse uniform black. In the pupa some specimens show 

 only the distal segments black. Body pale green. Abdomen without the black 

 markings met with in betulce. Wings transparent, the veins sometimes noticeably 

 dark brown. Stigma bordered below usually with dark browTi or black. Femora 

 whitish, tibiae and tarsi black. 



Body covered with a thick powdery material. Legs and sometimes parts of body 

 covered with flocculent mealy down which assists the insect in floating through the air. 



