108 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



SPIROSTREPHON LACTARIUM (Say) 



Figure 16, I, tn 



Julus lactarius Say, Journ. Acad. Nat. Sci. Philadelphia, vol. 2, p. 104, 1821. 

 Spirostrephon lactariuin Bkandt, Recueil de ni6moires relatif S^ I'ordre des 



iusectes myriapodes, p. 90, 1840. 

 Platops lincata Newport, Ann. Mag. Nat. Hist., vol. 13, p. 2G7, 1844. 

 Lysiopetalum lineata GEaivAis, Myriapodes; in Walckenaer and Gervais, His- 



toire naturelle des insectes, Apt&res, vol. 4, p. 133, 1847. 

 Cambala lactarius Gkbxajs, ibid., j). 134. 



Reasiu spinosa Sager, Proc. Acad. Nat. Scl. Philadelphia, vol. 8, p. 109, 1856. 

 I/ysiopetalum lactarium Packard, Proc. Amer. Philos. Soc, vol. 21, p. 183, 1SS3; 



and others. 

 LysiopetaUim cudusitin McNeill, Proc. U. S. Nat. Mus., vol. 10, p. 830, 1887. 

 Calliptis lactarius Bollman, Proc. U. S. Nat. Mus., vol. 11, p. 405, 1888; and 

 others. 



Descrlptio^h. — Length 30 to 39 mm ; width 1.8 to 2.3 mm ; number 

 of segments 55 to 59. 



Eyes composed of about 60 ocelli usually in 11 rows, counting 

 downward; sense organ about the size of an ocellus, located just in 

 front of the sixth and seventh rows of ocelli. 



Antennae long, reaching to the posterior border of segment 6, at 

 least. 



First segment nearly semicircular, with 20 longitudinal crests of 

 uniform height, those near the middle extending across the basal 

 two-fifths of the segment. 



Transition to the full number of dorsal crests occurs on segment 12. 



On the anterior half of the body the primary and secondary crests 

 are approximate in height, but on the posterior half they are differ- 

 entiated. Sides of the crests and the intervals between them un- 

 evenly granulate ; apex of the crests smooth and moderately shining. 



Lateral carinae rather prominent; pore borne in the thickened 

 outer margin in an elliptic impressed area, which is open in front 

 and reaches to the posterior third or fourth of the margin, except 

 on the posterior segments where it nearly reaches the hind angle; 

 on the segments near the middle of the body the pore is about one- 

 third of the way back in the impression. 



Below the lateral carinae are two prominent crests, which are 

 larger and more elevated than any of the dorsal crests; smaller 

 crests are present lower on the sides. 



Anterior subsegments with impressed longitudinal flutings on the 

 back quarter, the fiutings separated by fine beaded lines; anterior 

 three-quarters crossed by fine, low, shining, raised lines extending 

 back and slightly downward from the front margin; surface between 

 the lines distinctly reticulated. 



Male gonopods as shown in figure 16, tn. 



