THE AMERICAN ENTOMOLOGIST. 



species, just now referred to as beiiij;: almost 

 the exact counterpart in coloring of our Clubbed 

 Tortoise-beetle, occurred in tlie Botanic Garden 

 at Calcutta upon a convolvulus ; but to what 

 genus this insect belongs, authors do not in- 

 form us. 



The larva? of all the Tortoise-beetles, belong- 

 ing to the genera with the body greatly flat- 

 tened (CdsKiila and 

 Coptocycla), always 

 have the prickles that 

 project from their bo- 

 dies sprangled or bar- 

 bed, as will be re- 

 marked from our fig- 

 ures 174, 177, 179 iind 

 180. In the genus " " 



( Chclymorpha ) , to ''"i"'-'*-!'') i^iiok-i-.a mui hv.u-k. 

 which belongs a brick-red insect with black 

 spots (C7(. cribraria, Fabr., Fig. 2 a, pupa; 

 b beetle) found upon Milkweed (Asciepias), 

 and which has (he body greatly rounded above 

 with scarcely any lateral flange, the larva, 

 as observed by Dr. Packard, has the prickles 

 smooth and not sprangling. Tn the gcimsPAys- 

 oHo^tt, to which belongs a new species tigured 

 licn'widi, the Five-dotted Tortoisp-ln'cllc (I'll. 

 >linn<iii,'pimriata.\\.^\^., [!,;„. ... , 



I'ig. ■'!, b), and which 

 is intermediate in Ibrni 

 between the last named 

 genus {('helymorpha) , 

 and those with the body 

 greatly flattened {Cas- 

 sida, Coptocycla, De- 

 loyala), the prickles of " " 



the larva arc also Coiors-(i) sreenisi.-.vdiow. 

 smooth, as may be seen by referi-ing (o Figure 

 3 a. Thus it results that structura] differ- 

 ences in the perfect beetle arc accompanied 

 by corresponding struclural (lifrciciici's in thi' 

 larva.* 



As a general rule, to which as usual IIhtc arc 



tural differences in this group of plant-feeding 

 insects are acctompanied by structural differences 

 in the groups of plants upon which they ordi- 

 narily occur. We have seen that certain genera 

 (drissida and Coptocycla) are peculiarly at- 

 tached to the Convolndns Family; that another 

 genus {Beloyala) haunts the Solanum Family; 

 and that a tourlh genus {< 'hehimorpha) is gen- 

 erally Ibund on Milkweed. The genus to which 

 the Five-spotted Tortoise-beetle belongs {Phys- 

 onota) seems to be confined to the botanical 

 Family Composita-; for although we have not 

 Ix'cn able to ascertain the food-plant of this par- 

 ticular species, we have observed the One-dot- 

 ted Tortoise-beetle (Pkysonola nni^ninctata, 

 Say), feeding in the larva state upon a Sow- 

 Ihi.stle (Sonchvs); and as the name denotes, the 

 .Sunllowei Tortoise-beetle (Phys. helianthi, 

 Kandall), which we were assured by Dr. Le 

 Conle in 18G5 is rightfully referred to this genus 

 must feed upon Sunflower (Helianihus). 



Tn the second and third number of our first vol- 

 ume we gave an account of eleven distinct spe- 

 cies df insects, including the Black Blister-beetle 

 (Li///" <i/r(i/(i). that attack the potato. The 

 Bla.'k-ial r.lisici--beetle (Lyita murlna), which 

 is (Vc(|ucnll\ conl'ininded with the Black Blis- 

 tcr-l'ici'lli. ili<Mi;:h the former appears early in 

 .Inly and the lallernot till the middle of Au- 

 gust and forepart of September, has since been 

 received by us from Mr. Mungerof Lone Cedar, 

 Minnesota, with the statement that it nearly ru- 

 ined some fields of potatoes there in the fore- 

 part of July. To this formidable list of eleven 

 distinct kinds of Potato Bugs, we must now 

 add the Clubbed Tortoise-beetle, which no 

 doubt works upon the potato in the larva, as 

 well as in the perfect beetle state, though there 

 is ,as yet no direct evidence to that effect. 



It thus turns out that there are no less than a 

 do/.cn different kinds of Potato Bugs, differing 

 IVdui each (ilher in size, in shape, in coloring, 

 in haliils. in llie number of broods produced in 

 a siii;;le year, ill (lieir.i;eographical distribution, 

 and wh.'il is (if ninst iiraclical importance, in the 

 bcsl and iiiosl available metliod of fighting 

 I hem. And yet we can scarcely take up a 

 paiier. \v I lel her political or agricultural, without 

 stnnililing upon some paragraph informing us 

 that "THE Potato Bug'" is behaving thus and 



fs and i 



