July, '09] ENTOMOLOGICAL NEWS. 321 



fact that venafuscus is a very distinctive species. The wings 

 alone would serve to characterize it. Their dark, smoky con- 

 dition is similar to that commonly found in Lachnus, but un- 

 usual for Pemphigus, and the venation is heavier than any 

 known Pemphigus. 



Pemphigus venafuscns n. sp. 



Apterous viviparous. Large dark brownish globular forms. Mottled 

 in appearance due to six powdery discs on each abdominal segment, 

 two nearly mid dorsal and a lateral line of two on each side. At time 

 of collection these old forms were pulverulent rather than flocculent 

 over the general body surface but they possessed a flocculent caudal 

 tuft. 



Length of antennae, i.oimm. with segments as follows : i, .06 mm. ; 

 II, .15 mm.; Ill, .23 mm.; IV, .19 mm.; V, .18 mm.; VI, .2 mm. Total 

 length of body exclusive of antennae, 3.5 mm. 



Found in sticky, wooly colonies along twigs of ash chiefly 

 on new growth but somewhat on old. Collected at Orono, 

 June 21, 1906, together with minute progeny and pupae near- 

 ly ready for the last molt. 



Winged viviparous. Pupae collected June 21 on ash twigs were 

 saved in order to obtain the mature alate forms. The pupae were ex- 

 ceedingly flocculent over the whole surface of the abdomen. By June 

 29 they had molted and begun to produce. 



Head, antennae, thorax and legs black. Abdomen greenish black and 

 flocculent. Antennae and wings as in the fall migrants. 



Body length, 3 mm. Beak extending over the first third of the ab- 

 domen. 



Fall migrants. These winged sexuparae (form producing the true 

 sexes') were taken on the wing and collected from the trunks of lilac, 

 red ash and elm in October, 1908. At time of collection they resembled 

 the other winged viviparous generation except that they were bluish 

 black rather than greenish black and the abdomens of the migrant 

 sexuparae are shrunken in appearance and not plump like the other 

 viviparous forms. 



Head, prothorax, and thorax and legs black, flocculent. Antennae 

 black, 1.55 mm. in length with segments as follows: I, .1 mm.; II, .15 

 mm. ; III, .55 mm. ; IV, .25mm. ; V, .275 mm. ; VI, .225 mm. Straight 

 transverse sensoria occur regularly spaced, varying slightly in number 

 but averaging 19 on III. TO on IV, n on V, 4 or 5 on VI., Asensorium, 

 circular in shape, is distinct on distal n. Tin- usual terminal sensoria 

 on V and VI- Near the base of III there is an irregular jut, the 



