308 JOURNAL OP ECONOMIC ENTOMOLOGY [Vol. 1 



fig. 19. Length of body, 2.20 mm.; wing, 2.80 mm.; antenna, .80 mm.; joints: 

 three, .40 mm.; four, .12 mm.; five, .13 mm.; six, .07 mm.; joint three with 

 about 21 annulations; four with 3 or 4; five with about 5, and six with 1 or 2, 

 or none. 



The sexual females are brown ochre in color ;s4Jie males are dark green, or 

 a greenish brown; both sexes without beaks. 



Over Winter Young— Plate 5, fig. 11. 



The' following description is from specimens brought from Delta, Colorado, 

 where they were taken March 28, 1908: 



General color a dingj' yellowish brown, the head and prothorax being 

 darker, and in some specimens almost black, the head being the darkest part. 

 The antenna?, legs and the distal end of the beak are dusky brown. Length of 

 body, .65 mm. to .75 mm.; the width, .35 mm.; length of body to the end of 

 the beak, which pi-ojects caudad some distance beyond the abdomen, is .77 

 mm.; antenna five-jointed and .27 in length, rather stout and set with a few 

 stout hairs. There are very few hairs over the body. There is some varia- 

 tion in the general color, some specimens being considerable darker than 

 others. As soon as these little lice begin to feed, the color of the abdomen 

 becomes much lighter. A pair of hairs arising at the bases of the tarsal 

 claws of each foot are slightly knobbed at the distal ends. 



The European Grain Aphis, Aphis^ avenae Fab., the Clover Aphis, 

 A. hakeri Cowen, the Rosy Apple Aphis, A. pyri Boyer, and the Sweet 

 Clover Aphis, A. medicaginis Koch, all occur to some extent in Colo- 

 rado apple orchards. A discussion of these species is deferred for a 

 later number of the Journal. 



AP7TIDS INFESTING THE PEACH 



The Black Peach Aphis, Aphis persicae-niger Smith ; Plate 5, figs. 

 12. 13, 14. 



Some of the More Important Literature 



Aphis persicw-niger n. sp. Smith, E. F., Ent. Amer. 1890, pp. 101, 201. 

 Aphis persicw-niger Smith, J. B., N. J. Exp. Sta., Bull. 72, 1890. 

 Aphis persicw-niger Johnson, Md. Exp. Sta., Bull. 55, 1898. 

 Aphif! persicie-niger Froggart, Miscel. Pub. No. 760, Agrl. Gaz. N. S. W., 

 1904. 



This louse occurs in a few orchards only in Fremont, Delta and 

 Mesa counties. Early in the spring it attacks the tender bark of 

 small limbs and sprouts and often becomes quite numerous before any 

 of the buds open. We have searched in vain for males, sexual fe- 

 males or eggs of this louse. 



^This louse seems to me to fall readily into the genus Aphis. It does not 

 have the very long clavate cornicles characteristic of Passerini's genus Sipho- 

 coryne. According to Schouten and Kirkaldy Siphoconjne becomes a syno- 

 nym of Hijddfiphis. Kirkaldy. See Mem., Soc. Entom, Belgium, XII, p. 229. 



