1883,] 183 {Packard. 
species, yet upon receiving from. Dr. Latzel authentic types of European 
Lysiopetalum, it is plain that our S. lactarius is congeneric with them. 
The name Spirostrephon should, then, be considered as a synonym of Ly- 
siopetalum. It is difficult to see why Brandt should have separated lacta- 
rius from his L. carinatum. 
In his Recueil, p. 42, Brandt thus characterizes his genus Lysiopetalum: 
Lamine pedifera omnes libera, mobiles, cutis ope cum parte abdominalt cor- 
poris cingulorum conjuncte. Frons ante antennas dilatata et deplanata in 
maribus in simul depressa. The two species mentioned under the generic 
diagnosis are Lysiopetalum fatidissimum (Savi) and L. carinatum Branat. 
Again, on p. 90, ‘‘Subgenus seu genus II. Spirostrephon Nob.’’ is thus 
characterized, and he apparently regards it as a subgenus of Julus: Gna- 
thochilarii pars media fossa haud instructa, sede jus loco aream tetragonam 
planam, plica seu linea derata duplici, superiore breviore et inferiore longi- 
ore, supra et infra terminatam, sed sutura longitudinali haud divisam of- 
ferens. Spec. 27. Julus (Spirostrephon) lactarius Nob....... Differt 
habitu a Julis genuinis et Julo (Lysiopetalo) foetidissimo et plicato affinis 
apparet. Annuli corporis, quorum posteriores brevissimi, incluso anali 
58. Pedum paria 95. Longitudo 10-11"; latitudo summa #1 Oculi tri- 
angulares—Julum lactarium protypo generis Cambala Grayi habuissem, 
quum figura ab hocce zoologo sub nomine Cambalee lactarii data (Griffith 
Anim. Kingd. Insect., pl. 185, fig. 2). The generic characters are not very 
applicable in distinguishing the genus, the mention of the type alone ren- 
dering it possible to understand what the genus is, 
The synonymy will be farther discussed under Cambala. In 1844, 
Newport, having been misled by the specimen of Ownbala annulata alleged 
to have been sent by Say as the type of his Julus lactarius, places the latter 
in his genus Platops, which he proposes, with a doubt, thus: ‘‘Genus 
Platops? mihi.’’ The generic characters apply well to the present species, 
S. lactarius. 
Dr. Wood, in his Myriopoda of North America, does not attempt, for 
want of material, to define the genus. Prof. Cope characterizes this and 
the next genus thus : 
Annuli without pores.......++.- iar 6 vibe Nae Via dws Hoi ohte Spirostrephon. 
Annuli with two pores on each side the median line.......Pseudotremia. 
As we have seen, there are pores in Lysiopetalum, while the “two 
pores”’ of Pseudotremia are two of the three setiferous tubercles on the 
side of each segment. 
The genus appears thus far to be represented in North America by but 
a single species, which ranges from Massachusetts west to Iowa and south 
to Florida and Louisiana, while in southeastern Europe Lysiopetalum is 
rich in species. 
LystoPETALUM LACTARIUM Say. 
Julus lactarius Say, Journ, Acad. Nat. Sc. Phil., ii, part i, 104, 1821. 
Sprrostrephon lactarius Brandt, Bull. Sc. St. Pet., 1840; Recueil, 90, 1840. 
