THE AMERICAN ENTOMOLOGIST. 



39 



Insect Foes o* thcBarlc-louse. — Dr. Jas. Weed, 

 Muscatine, /a.— The insect which you found preying 

 upon Harris's Bark -louse (Aspidiotus Harrisii, Walsh), 

 and which you think has effectually cleaned your trees 

 of that little pest, is the larva of the Twice-stabbed 

 Ladybird (CUlocorua Umlnemu, Muls). The middle 

 figure below gives a rough sketch of this very useftjl 

 larva, and the right hand figure an accurate drawing, 

 considerably magnified, of the beetle into which it 



mg- 32.] 



It liund figure is the Northern Lady- 



(''", Thunb.), the larva of which 



11 nf your Insect; but, instead of 

 iiM^cts, as thatdoes, isvery injuri- 



1 -; uis to the fruit and foliage of the 

 X. A. L;L(Ivl.inl/s,. I';ir:is 



been met with, and pcrli; 

 particularly a Northern > 

 year 1867, by wai? of cxi 

 dozen living specimens ni 

 upon an apple tree badly 

 Bark-louse {Aspidiotus <■■ 

 June, 1868, we had the pi 

 increased lilh -fuld, ;ind 



luauisim, nte., ami otners. — Beginners wno aesireto ac- 

 luire, without much trouble, ageneral knowledge of our 

 Vortli American insects, and especially of those which 



inded to pro- 

 's. (Boston, 

 plates, $fi.) 

 iarize thcm- 



l'>iiluiiujlu.i,'y , 

 ',:ti,„i. (Lon- 

 l>locksof out- 

 lis last work 



are of economic impDiiaiK''. arr r i 



cure Dr. Harri.'- uu.k .„ ; 

 1862, one large <.i-1:um: |,,i, ::, . . 



Those who rei|uiiT. in i l.in i-n , m m 

 selves with the natural iii-iMiy i.i tlir 

 whole world, should getKiiiiy .iopriiic 

 (London, 1857, one stout duodi-.'iiiK., 

 about $2.) For any one who .l.-iic^ i 

 mentsofa thorough scientific- kiiciwlcil^i' 

 the very best work is "Wesiwoud's ////,', 

 don, 1838-40, two large octinds. with PI 

 line woodcuts, .and colorc<l phit.-.) ' 

 iSj we believe, now out dl' piiiit. Iml iii 



cheap ut :?;pi nr .-^ir) Aiiit prnci-i-.liim- sc 

 student IkmI Pol take up smiuc >iH-cial en 



instead «■!' l'rilli-]-iii- awav lii- lii ii tli 



of all til.' unha>. 'I'lii' i;,Tllr> (nnln- i 

 always lin-ii iIh- la\uritr nrdcr Inr tjii- pi 



best wiirk u] X..rlli Ainniran llia-ih- 



is LeCi>iiP''s iNtrn.lu.tiui, . iSiiiiili.-iiiiia 

 Wasliinglun, D _C., IWJl; unu tbiu ucl 

 woodcuts, price $ — .) 



l.arvae in Plum-gum.— PM. Rickert, Milwaulcee, 

 Wis — The small larva; found by you in the gum oozing 

 out of the bark of your plum trees are most probably 

 those of some two-winged tlv (onlcr l>i)ilira), and have 

 nothing to do with the Curriili.i, wlii.h is a beetle (or- 

 der GoUaptera). Since, hnwrvi-r. vou send no speci- 

 mens, we can give you no more detinite infoi-mation . 

 From small, white, thread-like worms, feeding upon 

 the gum and detritus of the peach tree, we have bred a 

 small two-winged fly, belonging to the genus Mycetn- 

 phila, an account of which was given in the Prairie 

 Farmer oi 3\xae\ot\i, 1807. Yours is possibly the same. 



: lew 



Insect Foes of the Hop Vine./— J/r«. S. C. 

 Freeman, South Puss, Ills. — The pale green caterpillar, 

 about one inch and a half long, with bunches of diverg- 

 ing green prickles on its back , which sting the tenderer 

 parts of the human body like a nettle, is the larva of 

 the lo-moth {Saturnia lo, Fabr.), a large and handsome 

 insect, with a great round eye in the middle of the hind 

 wing. You found it, as you say, on the hop vine, but 

 it feeds on a variety of other plants as well, though it 

 never occurs in such numbers as to be materially in- 

 jurious The smaller caterpillar, about one inch and a 

 (piaitcr loiiv- when full grown, with its body variegated 

 Willi iiiouii and yellow, and with long .sprangling 

 prirkh^ ut a I lark color on its back, which vou also 

 ronn.l .ill lh>' ho], vin,.-, is the larva of the S.'Uii.-olon 



pii|.a ..r- s])ecies of 



him .-ar.'liilij-, for he is 

 I.' Liii>loiiiiiio to possess 

 dur as the Bed-bug and 



which go undergr. 

 Like aunost all cai 

 velocity; whereas 

 general rule, dull ; 



the fori, 



ty were deatl and 

 lis grub or worm. 

 i-t its rights, for it 

 ' Your supposi- 



to tlie pupa state, 

 nil with prodigious 

 lu' insects are, as a 



all Ihei; 



stage 



OaU Tree Caterpillars— TT. W. Daniells, Uni- 

 va-sHij, Madison, Wis. — The caterpillars of a bluish 

 white ground-color, marked longitudinally with yellow 

 bands and tine hl.i.k linrs, with the head and a hump 

 on till' 11th K. -111. nit .'ithir of a light coral or dark flesh 

 color: an. I w lii.h '^.n.i ally rarry the hinder portion of 

 the ho.ly .'K'NaP-.l in th.' air, are the larva: ot Edema 

 ulhi/njits, I'a. kar.l. a -lay moth characterized princl- 

 lialiy, as its nam.' iiii[.h.s. by a broad white mark on 

 the outer lialf.>t th.' ant. rior margin of the front wings . 

 You say 'Mh.'-.' . at. rpillars have been quite destructive 

 to the leaves ol the white and burr oaks on our 

 grounds. ' ' They have long been known to attack the 

 oak . Some that we reared the present season entered 

 the ground and changed to chrysalids during the last 

 days of September, and came out as moths about the 

 middle of April. 



