148 



THE MYRIAPODA OF NORTH AMERICA. 



Gen. 1. LITHOBIU8, Leach. 



Antennas multiarticular. Caput latum, complanatum. Labium antice dcnticulatum, medium sulcatum, 

 emarginatum. Coxarum excavationcs magna, ovata3, in scrie unica in facie depress, deposits). (Fig. 6.) 



Antenna multiarticulate. Head broad, complanate. Labium anteriorly denticulate, medianly sulcatc, cmar- 

 ginato. Pits on the coxa large, ovate, arranged in a single scries on a depressed face. 



L. Americanus. 



" L. ferruginous ; capite magno subquadrato margine postico elevato ; antonnis pubesccntibus; ocellis nigris 

 Pig. 6. utrinquc 25 — 26; Iabio complanato, polito, margine fere recto; donticulis 10, parvis, nigris, 



subapproximatis, scutis bevibus, convexis, subquadratis postice rectis; segmonto prasanali 

 piloso, pedibus validis flavis spinis validis armatis." 



Ferruginous; head large, subquadratc with the posterior margin elevated; antenna pube- 

 scent; ocelli black, on each side 25 — 26; labium complanate, smooth, its margin almost 

 straight; denticulos 10, small, black, subapproximate ; scuta smooth, convex, subquadratc 

 posteriorly straight; preanal segment pilose, feet robust, yellow, armed with strong spines. 



L. americanus, Newport, Linn. Trans, xix, p. 305; Catalogue of British Museum (Myriapoda), p. 17. 

 " " I'. Gervais, Apteres, iv, p. 236; ct Tabl. des Myriap. (Kxp. Ameriquc du Sud), p. 29. 



? L. sriNiPES, Say, Journ. A. N. S., 1st series, vol. ii, p. 108 ; et in (Euvr. Entom. Ed. M. A. Gory, 1, p. 21. 

 tL. spinii'ks, Lucas, Hist. Nat. Anim., Art. iv, p. 543. 



" L. multidentatus, Newport," Wood, Journ. Acad. Nat. Soi. 1863, p. 13. 

 " L. AMERICANUS, Newport," Wood, loc. cit. p. 14. 



When I wrote my paper on the North American Chilopoda, I had not a large mass of 

 material at my disposal, and fell into error in my identification of Mr. Newport's species. 

 The characters which he relies on in separating his L. multidentatus and americanus vary 

 so much in the two species that the extremes meet, and hence my mistake. The average 

 number of ocelli is greater in B. multidentatus, but individuals occur of L. americanus 

 with 33 ocelli, thus coming within the number assigned to multidentatus by Mr. New- 

 port. The diagnosis of the species given above is that of Mr. Newport. The number of 

 ocelli and labial teeth are too small. I would say, ocelli utrinquc 26 — 33, denticulis 10 — 

 15. The head and scuta are distinctly but rather sparsely punctate. The alternate small 

 scuta are proportionally very large. The scuta are quadrate or subquadratc. The poste- 

 rior margins of the larger ones are straight, and the angles not prolonged, except in the 

 last two or three, in which the posterior margin is somewhat crescentic. The angles of 

 the lesser scuta are more prolonged than those of the others. The dorsal surface is not so 



