Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . is more distinctly divided into seg-ments than any other Arachnids,and hence the scorpions bear, asGerstaecker suggests, a stronganalogy to the Myriapods. Thegenus Scorpio is restricted to thosespecies which have six ocelli. Wood is our only NorthAmerican species and is found inLower California. Our other spe-cies are mostly comprised in thegenus Butlms, which has eightocelli. B. Carolinianus Beauvois(Fig. 637) ranges from the South-ern
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . is more distinctly divided into seg-ments than any other Arachnids,and hence the scorpions bear, asGerstaecker suggests, a stronganalogy to the Myriapods. Thegenus Scorpio is restricted to thosespecies which have six ocelli. Wood is our only NorthAmerican species and is found inLower California. Our other spe-cies are mostly comprised in thegenus Butlms, which has eightocelli. B. Carolinianus Beauvois(Fig. 637) ranges from the South-ern Atlantic States through Texas Fig- fi37-northward into Southern Kansas. Scorpions are dangerousin proportion to their size, their age, the state of irritation theymay be in, and the temperature of the climate in which theyreside. The wounds, however, even of the largest species arerarely fatal. (Moquin Tandon.) Messrs. Meek and Worthen have described (Palaeontologyof the Illinois Geological Survey, iii, p. 560) two fossil scor-pions from the lower part of the coal measures of Illinois,which are as highly developed, and bear a very close resem-. fi60 ACAHINA, bianco to the living species. The Eoscorpimi, mroovurfns ofMeek and V\ orthen is said by them to resemble closely But/nixhh-xiiliix from California. The other fossil scorpion is the .!/•.-zonia Wbodiana M. and W., which differs from any knownliving forms in not having any lateral eyes. Very differentand belonging to a much more degraded and embryonic typeis the CydopJithalinus Bm-kln-ixU- from the Coal Measures ofBohemia, in which the tail is continuous with the body, beingunusuallv thick. A ( A li [ N A . THE Mites dilfer from other Arachnids by their oval orrounded bodies, which are not articulated, the cephalothoraxbeing merged with the abdomen : the mouth-parts are adaptedeither for biting or sucking, and they breathe by are usually minute in size ; the ticks, which are some-times half an inch in length,
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