211 
anal joints of abdomen with a few conspicuous hairs. Full grown, 
apterous female, probably of this same generation, differs in having 
6-jointed antennae, proportion much as in the winged female. 
Larva from winged females; probable fourth generation: Antennae 
5-jointed; joints 1, 2, 3, 4, subequal in length; 3, 4, stourter; 5 very 
shourt and rounded at tip. Promuscis very long, reaching beyond 
tip of abdomen. 
Tolerably common at Saint Louis, Mo. (Riley, Monell); Sauk City, 
Wis. (Thomas'). 
The life-history of this insect has not been fully studied, as the 
sexed individuals, and the winter egg have not been observed. It 
will doubtless be found to agree in most particulars with that of 
Schizoneura americana. 
The species stand somewhat in the same relation to the European 
Pemphigus fraxini (Fabr.) as does Schizoneura americana to S. ulmi , 
The European species is larger, with the wing-veins differently placed, 
and inhabits the twigs and stems, instead of the leaves; but otherwise 
there is a good deal of resemblance between the two.” 
This is undoubtedly the same Species that I have described under the 
same name in the preceding part of this report. As Prof. Riley’s 
description was published first, his name must stand as author of the 
species. 
The following list of species of plant-lice described by Haldeman 
and Rafinesque is taken from a note in Mr. Monell’s paper. As I 
have not acess to the works of these authors I am unable to give the 
descriptions or to assign the species to their proper positions. 
Aphis rubecula Haldm. Proc. Post. Soc. Nat. Hist. vol. i, p. 168, 
1844. 
Aphis bicolor Haldm. 1. c. p. 168. 
Aphis marginipennis Haldm. 1. c. p. 168. 
Aphis pilosa Haldm. 1. c. p. 169. 
Aphis discolor Haldm. 1. c. p. 169. 
Aphis verticolor Raf. Am. Monthly Mag. and Critical Review, i, p. 
361, 1817. t 
Aphis furcipes Raf. 1. c. i, 361. 
Aphis rhodryas Raf. 1. c. iii, 15, 1818. 
Aphis diplepha Raf. 1. c. iii, 15. 
Aphis oreaster Raf. 1. c. iii, 17. 
Aphis gibbosa Raf. 1. c. iii, 17. 
Aphis xanthelis Raf. 1. c. iii, 17. 
Aphis annulipes Raf. 1. c. iii, 17. 
Aphis ambrosia Raf. (nec Thos). iii, 17. 
Aphis acaroides Raf. 1. c. iii, 17. 
PSYLLIDJE. 
Since the foregoing report was placed in the hands of the printer, I 
have obtained a copy of the Transactions of the Entomological Society 
of London for 1876, containing a “ Monograph of the British species 
