OF LANCASTER COUNTY 



CLASS MYRIAPODA. 



As tlie name implies, this class is composed of oblou;; or loii^; animals, with many 

 feet, of which there are not a large numbei- of species fonnil within tlie limits of Lan- 

 caster county; and although some of them are very common, yet very little attention 

 has been devoted to their specific history by a resident naturalist. Of this class there 

 are two divisions, very distinct in their structure, form and habits — commonly called 

 Centipedes and Millipedes. "The Myriapoda are air-breathing apterous aiiiculata, char- 

 acterized by the distinctness of the head from the body; the strongly marked st>ginen- 

 tation of the latter, and its method of development." According to s]x'cialists. they 

 constitute two distinct Orders, called Chilopoda, including the centipedes; and Diplo- 

 PODA, including the millipedes. The former are known, in many instances, to be car- 

 nivorous in their habits, and some of the latter are equally Avell known to be herbivo- 

 rous. The Chilopods comprise those that have the body tlattened with a limited number 

 of segmental rings, to each of which is attached a single pair of feet, at the sides. The 

 diplopods on the other hand have the body tube-shaped, or cylindrical, with a double 

 I)air of feet attached to each segment, beneath. The former are very swift runners, 

 whilst the latter seem to glide along very slowly, and when internipted throw themselves 

 over on the side in a spiral coil. There is, however, a subdivision of the Chilopoda 

 called Chilogkatha, which seems .to be a connecting link between the two orders 

 above named. These possess the flattened bodies, with the legs articulated at the 

 sides; but there are two pairs to each segment, and like the diplopoda. they are slow- 

 travellers. Large species of the diplopods — from three to four inches in length — are 

 found in the wooded valleys of Lancaster comity, especially in the southern tier of 

 townships. These have been detected feeding upon the various species of funr/i that 

 are common to those localities. Although the common names of Centipedes and Milli- 

 pedes, applied to these animals, would seem to indicate that they possess respectively a 

 hundred or a thousand feet; yet there are species that exceed the first number, but 

 none that reach the last. 



ORDER CHILOPODA. 



Fam. I. Cermatid.e. 



Cermatia III. 

 forceps Wood. 

 coleoptrata? Bay. 



FaM. II. LlTHOBIlD^. 



LlTHOBIUS Lch. 

 americanus Nicp. 



BOTHKOPOLYS Wood. 



multidentatus Nicp. 



Fam, III. SCOLOPENDRID.E. 



Opisthemega Wood? 

 spinicauda Wood. 



SCOLOPOCRYPTOPS XlCp. 



sexspinosa Kiop. 



Fam. V. GEOPHILID.E. 



Geopiiilus ScJi. 



cephalicus Wood. 

 Strigamia Gray. 



fulva Sayer. 



walkeri? Wood. 



SUB-ORDER CHILOGNATIIA. 

 Fam. I. Lysioptalidx. 



SpiROSTREPnox Brndt. 

 lactarius Soy. 

 csesioannulatus Wood? 



Fam. II. Polydesmid.e. 



Polydesmus Lnt. 

 setiger Wood. 

 granulatus Say. 

 serratus"? Say. 

 canadensis Miep. 

 erjlhropygus Bvndf. 

 hispidipes Wood. 

 virginiensis Dm. 

 corrugatus Wood. 

 trimaculatus Wood. 



ORDER DIPLOPODA. 



Fam, I. JuLiD-E, 



