BEETLES. 



321 



hroods yearly. J. A. Oshonie fouml that pavtlienogenesis sometimes occurreJ in 

 (t. rdphiini, a species fuuml in EnglanJ. 



The must brilliant jjerhajis of the American species of Chrysomeli(la> belong to the 

 genns ('hnjisochus. This genus, and a few others associated with it, differ from 

 Clirysomela and the forms just described in that they have the third tarsal joints 

 bilobed. Chrysochus auratuK, from the eastern United States, is oblong-oval, about 

 0.4 inch l')ng, of a brilliant metallic green, which, viewed in different directions, changes 

 to deep red or bright bine shades. During Jidy and Atigust this species is very 

 conmion on dog-bane {Apoc;/nuju). In the Pacific States C. cobaUinns, of a change- 

 able cobalt-blue, is very ccunnion. 



Belonging in tlie group with C/a-i/soc/ius, but less brilliantly colored, are Adoxiis, 

 J^idia, Colaspis, Faria., Scrlodonta, and Purhnephorus. The larva? of Ado.r/is rifis 

 — a little jmliescent lilack species with liniwnisli-yellnu- elytra and legs, and with the 

 first four joints of the antennre pale — does much damage to the 

 grape in Europe and is foiuid in America. It is about 0.1 inch 

 long. I'^idUi viticida, a chestnut In-own sj)ecics with short whit- 

 ish hairs, injures the grapes in the Western Stales by riddling 

 their leaves. The beetle is about 0.3 inch long. Colaspns 

 ^/favida, a clay-yellow species aliont 0.25 inch long, attacks the 

 grape, upon the roots of whicli its larvfe feed. ('. briaaiea., a 

 brown species of which C. flavida has been considereil a variety; 

 Paria aterrima, a Ijlack species of about the same size as Colas- 

 pis ,' and Scelodonta nebulosits., an ashy gray species of like size, 

 all feed as larvse upon strawberry roots, the larva3 of three species 

 lieing very much alike. Paclintp/ionis ci//uidrieits, which is fig- 

 ured, is from Europe and northein Africa. 



The species of Cn/2>toc'/i/ia?Ks are short, eylinilrical, and generally small. They 

 resemble those of Pac/ii/brav/it/s, but in the latter genus the prothorax is margined at 

 the base and not crenulate, while in Crtjpttoc<p>halus it is not margined at the base and 

 is crenulate. In both genera the prothorax is nearly as wide as the elytra are, and the 

 perpendicular head is set deeply into the prothorax ; the autennfe are filiform. The 

 larvae iuhaljit little cases upon leaves of different trees. Beetles and larva' alike have 

 a liaViit of falling to the ground when <listurbed, tlius escaping observation. The 

 number of species of Cri/ptoaqdiains and Pachybrachj/s is large, there being in the 

 United States about forty described species of each genus. The species are usually 

 prettily marked with colored strijies or spots. Cri/ptoccp/icdus con- 

 Jfiiois, which is figured, will give a good idea of the form and of one 

 type of figuration in these genera. It is a jtretty North American 

 s]iecies, in which the general coloration is yellow, that of the thorax 

 being tinged with brick-red, while three black longitudinal Hues adorn 

 each elytron. Two of these lines are confluent u]H>n tlic elvtral 

 suture, whence the specific scientific name. Westwood mentions 

 that the larval cases of a species of Ziamprosoma, a genus near 

 Cryp>tocep>halus in classification, mimic with remarkable accuracy 

 the buds upon the bark of the trees on which the larvae feed. 

 In Europe there are numerous species of a genus resembling, in general, Crypto- 

 w/*/(rt/(^s,bitt of larger insects; this is Clythra. In rY//</(ra, however, the antenna? are 

 serrate and the anterior coxal cavities are confluent, not as in Cryptocephalus separated 



VOL. II. — 21 



356. — Parfinijjl{urti6 

 cijUndrU-u^i. 



Fin. 3.)7. — Cri/plo- 

 cepliulus cotiftiL- 

 ens. 



