"^'iSi!^,i:t" ^MMm in the Uni.

CHALCIDIDJE. 357
gall Q. semmator, Harr.; E. punctiventris, ibid, from gall Q. mamma,
Walsh; E. abnormicornis, ibid, 9., taken at large; E. diastrcphi, ibid,
from bramble-gall of Diastrophus nebulosus, O.-S. [var. bolteri, Riley, from
lepidopterous gall of Gelechia gallcesolidaginis, Riley, recharacterized]; E.
gigantea, p. 300, 9. taken at large. E. studiosa (Say) is recorded (p. 299)
as being bred from four different Cynipidous oak-galls, from five different
Tenthredinous willow-galls, from six different Cecidomyidous galls on willow,
goldenrod, and ironweed, from Aphidian and Coccidous leaf-galls on shellbark
hickory, and from fungoid growth on pignut hickory. These are all
stated not to differ from Say's species ; but slight colour vars. have been also
bred from two other oak-galls. The N. American spp. of Decatoma are
tabulated (p. 300), and the following new spp. and vars. described:—D.
varians, ibid. f. 2, from oak-galls Q. podagree, Walsh, Q. spongifiea, Q.
inanis, and Q. palustris, O.-S., and var. dubia from Q. mamma, Walsh;
D. nigriceps, ibid, from oak-gall Q.ficus, Fitch, and var. exci-ucians, p. 301,
from gall Q. seminator, Harr.; D. hyalipennis, ibid, cf and $ taken at large ;
D. simplicistigma, ibid, from Cynipidous oak-galls, Q. erinaceus, Walsh, Q.
petiolicola, Bass, and Q. ficus, Fitch; D. nubilistigma, ibid, from Cecidomyidous
willow-gall S. batatas, Walsh, and an undescribed gall on swamp
white oak. Isosoma hordei (Harr.) is again discussed (pp. 320, 330) and
figured (figs. 3 & 4), with details, and a long and interesting digression upon
dimorphism in Cynips is made, as bearing upon the author's proposition that
many insects, absolutely undistinguishable externally, yet of widely different
habits, may be taken as differing widely internally, and therefore as being
specifically distinct. On the other hand, the author admits that many dimorphous
forms of the same species are probably now erroneously considered
to be distinct. The author proceeds to recharacterize (p. 367) Semiotellus,
Westw, so as to properly include in it a new species which he had hitherto
referred to Glyphe. This is S. chalcidephagus, sp. n, p. 368, f. 7, parasitic
upon Isosoma hordei (larva also described). Finally, Walsh describes a new
genus of Encyrtides, viz. Antigaster, p. 368, in which the body is capable of
rolling up in the contrary way to that of Chrysis. Sp. A. mirabilis, sp. n,
Walsh, I. c. p. 369, f. 9 $, Rock Island, Illinois. The cf, bred from eggs of
Phylloptera oblongifolia, is described by Riley, ibid., and figured with its
pupa &c. f. 10.
MULLER (Ent. M. M. vii. p. 60) notes the abundance of pupae of the 9. of
Callimome devoniensis, Pftt, in small galls of Cynips lignicola, Htg.
Blephonira, g. n, Holmgren, Eugenies Resa, Ins. i. p. 438 (no comparative
diagnosis given). B.fulvipes, sp. n, Holmgr. ibid. Taf. viii. f. 6, China.
Oomyzus, g. n, Rondani, Nota &c. p. 5. Sp. O. gallerucce (Fonscol,
Pterom.), parasitic upon eggs of Galleruca xanthomelcena.
New species:—
Chalcis maeulata, p. 434, variegata and pallida, p. 435, I. Puna; subfasciata,
p. 436, Buenos Ayres: Holmgren, I. c.
Chalcis maria, Riley, Amer. Ent, ii. p. 101, note, fig. 66, bred from Attacus
polyphemus and A. promethea, Kentucky.
Chalcis (Aphelinus) mytilaspidis, he Baron, Amer. Ent. & Bot. ii. p. 360,
note, f. 220, parasitic upon the " Apple-tree Bark-louse.'' A full account of
its economy is given ibid. pp. 360-362.