396 



NATURAL HISTORY OF ARTHROPODS. 



Fig. 480. — Chlmdus 

 " scricaLs. 



the prothorax, aiul a stripe of the same color along the middle of each elytron. Much 

 larger (about ().(j of an iueli), but of siniilar form, and pale-bvown coloration, without 

 distinct black markings, is Geopinus incrassatits, a common New England species. 

 In Geopinus, Agonoderus, and other genera of the group to which they belong, the 

 left mandible is longer than the right one, and overlaps it distinctly in the first-named 

 genus. 



The genus ('hlti)tius includes beetles of meclium size, which usually are of a si'reen- 

 ish or purplish bronze color above. Sometimes the margin of the 

 elytra or a few spots ui)on them are yellow. They fre(]uent moist 

 pl:ices l)eneath stones, and attain their maximum size and beautv 

 in Africa. Most of the species have an odor somewhat like that of 

 -Morocco leather. V. scriceus, a bright green .sjiecies, with brown 

 .antennie and legs, is coniMuni ahnig the banks of the larger rivers in 

 the north-eastern United .States. C. tome}ito/ii(,% from the same 

 region, is of a deep juirplish bri)uze color. 



The genus Bruchinus, already mentioned on account of its habits, 

 consists of over loU species distributed throughout temperate and troj)ical parts of the 

 world. The beetles of this genus are mostly red, with blue or green elytra, and are 

 found often in numbers together beneath stones. The species are very difficult to 

 distinguish, but the genus is readily distinguished by its form, colors, and hal)its. The 

 specific names uriniyei; hellicosus, Jxtuilxirda, crepitans, exhalans, ex- 

 plodens, J'>i)>ia?is, senator, and the like, have reference to the habits of 

 the bomb:irdier-beetles. 



Numerous small species of Carabidie, which are much flattened, often 

 ornamented with bright colors, and many of which frequent liower.s, 

 belong to the genus Lcbia, in its older and less-restricted sense. J^. 

 gj'andis, one of the larger sjiecies of this genus, measuring about (i.4 

 of an inch in length, is yellowish-lirown, with dark-blue elytra. This 

 insect has proveil useful l)y eating the eggs of the Colorado potato-beetle 



{Doryphora decemlineaUi). Tlie genus Coptodera, of which C ernar- 

 ginata, from Brazil, is figured, does not differ greatly structurally from 

 Lebia. Dromins, another genus closely related to Lebia, has a heart- 

 shaped prothorax. D. ina-iis, a common North American species, is 

 shining black and about rt.o of an inch long. D. quadrinotatns, found 

 ^/£- ^^2- ■" P^^'"" in Euroiie, feed.s, as larva, under the bark of i)iues, 



aera emarqinata. 1 ' ' ^ i ' 



upon the larv;e of Pissodes notatiis, a weevil. 



Of the genus Gakrita there are five North American species. 

 In the northeastern Unitetl States, G. janiis is common under 

 stones in early summer. Its length is about 0.75 oi 

 an inch; its antenna', ]irothorax, ;nnl legs are red, 

 and the rest of the beetle is bluisli-bl.ack. The head 

 is much elongated, and the jirothorax is not half as 

 wide as are the elytra, which latti'i- are truncate at tin- 

 tip. In Casnonia, which includes small beetles, the 

 structure is quite similar to that of Galerita, but 

 the thorax is very much more elongate. ('. pennsgl- 

 ounica is not rare under stones. Its length is about 0.25 of an inch, and its color is 

 brown and black, the head, prothorax, and spots upon the elytra being of the latter color. 



(frandis. 



Ltbia 



Fig. 484. — Cas- 

 naniapenniiifl- 

 vanica. 



Fig. 4S3. —GaleritK Janus. 



