60 MEMOIRS OF THE NATIONAL ACADEMY OE SCIENCES. 



Spirostrephon lactarius Cope, Proc. Amer. Phil. Soc, Phil., xi, No. 82, 179. 1869. Trans. Amer. Ent. Soc, 



iii, 66, May, 1870. 

 Spirostrephon lactarius Ryder, Proc. U. S. Nat. Mus., iii, 526, Feb. 16, 1881. 

 Lysiopetalum lactarium Packard, Ainer. Nat., xvii, 555, May, 1883. 

 Not Cambala lactaria Gray, Griff., Cuvier An. King. Ins., PL 135, fig. 2, 1832. 

 Not Camoala lactaria Newport, Ann. Mag. Nat. Hist., xiii, 266, April, 1844. 



Two males, two females. Body segments, exclusive of the head, 61, with 115 pairs of legs. Body and head horn 

 color, usually mottled and banded with dark blackish horn color. The head usually with a broad, interautennal, 

 black, conspicuous baud inclosing and connecting the eyes. Eyes (compound) of 40 to 41 facets. Antennae dull, 

 blackish brown; tip of the terminal joint pale, as also the other joints at their articulation. The body with a 

 median dull yellowish dorsal stripe, and with a lateral row of concolorous diffuse spote, one on each longest lateral 

 ridge (the spots vary much, sometimes covering four or five ridges and extending low down on the sides of the scute. 

 Each scute has, except those near the head and at the end of the body, about twenty-five prominent ridges, the dorsal 

 twelve larger than those on the sides; these ridges are high, with concave valleys between them; the end of the 

 ridges are acutely conical and project over the ends of the scutes. 



Length of the entire body, 35 mm ; thickness, 2 mm . 



The above description was drawn up from the Louisiana specimens, which were highly colored, banded, and 

 spotted. In tho Massachusetts specimen the color is uniformly light brown, without the yellowish dorsal line and 

 the lateral spots. The antennas are much darker, while the legs are paler than the body. The head is much paler 

 than the body ; it is dusky on the vertex between the eyes, but there is no definite interantennal band as in the 

 Louisiana examples. 



The Iowa specimens resemble in coloration those from Louisiana, but the yellowish dorsal band and lateral 

 spots are not quite so distinct, though the interantennal blackish band is distinct. 



Massachusetts and McGregor, Iowa. Mus. Agricultural Department, Washington, D. C. (Prof. C. V. Eiley) ; 

 Palatka, Florida, and Milliken's Bend, Louisiana (E. Burgess); "Eastern United States" (Wood); fouud under 

 bark in the mountain regions of Tennessee and North Carolina (Cope),; Saint Louis (Theo. Pergande). 



Although this species is evidently the parent form of the cave-inhabiting Pseudotremia cavernarum, it has not yet 

 been observed near the Indiana and Kentucky caves, though undoubtedly yet to be found in their vicinity, as it is a 

 wide-spread species. It probably ranges through Central into South America. As Dr. Wood remarks: "I have seen 

 a single specimen, a female, labeled as coming from New Grenada, which apparently belongs to this species." This 

 specimen I have seen in the museum of the Philadelphia Academy of Natural Sciences, but did not compare it closely 

 with our species ; it is much larger than individuals from the United States. 



Pseudotremia Cope. 



Pseudotremia Cope, Proc. Amer. Phil. Soc, xi, No. 82, 179, 1869. Trans. Amer. Ent. Soc, iii, 67, May, 1870. 

 Spirostrephon Cope, Amer. Naturalist, vi, 414, July, 1872. 

 Pseudotremia Harger, Amer. Journ. Sci. and Arts, iv, August, 1872. 

 Pseudotremia Ryder, Proc. U. S. Nat. Mus., iii., 524, Feb. 16, 1881. 



Body consisting of thirty segments; rather long and slender, with as many as fifty pairs of legs. Head with 

 the muscular area (gena) behind the eye very full and swollen, globose, swelling out far beyond the side of the suc- 

 ceeding scutum; front a little longer than wide. Eyes present, black ; the outline of the eye-patch narrow triangular, 

 composed of about twelve to fifteen facets, arranged in four or five transverse oblique series. Antennas longer and 

 slenderer than in any of the other genera of the family; joint 3 is twice as long but not as thick as joint 2, but equals 

 fifth in length, the latter, however, being very slender and clavate; the terminal seventh joint is unusually long, 

 pear-shaped, and elongated towards the tip. 



The body constricts in a neck-like fashion behind the head; segments (scuta) 5 to 20 especially have a lateral 

 shoulder or raised portion characteristic of the genus Lysiopetalum ; this swollen portion has ou each side about six 

 longitudinal ridges, with deep valleys between ; above, especially on the posterior half of the body, the dorsal portion 

 of the laterally-swollen scuta is coarsely tuberculated instead of ridged, and the rounded tubercles are rather flat 

 and unequal in size. There are no setae or lateral setiferous tubercles. The end of the body is as usual in the family, ' 

 the last segment with three pairs of small setae arranged one above the other. 



Above the middle of the side of the posterior scuta, especially the last 6, is a tubercle like those in Scoterpes 

 and Zygonopus, but much smaller, from which a minute hair arises, and above, on the upper part of the shoulder, 

 there are two rudimentary very small tubercles. 



The legs are long and slender, about one-third longer than the diameter of the body. In the male the eighth 

 pair of legs are much less modified than in the succeeding genera ; it consists of five joints, while in Trichopetalum, 

 Scoterpes, and Zygonopus it is very rudimentary, consisting of but two joiuts. The basal joint is large and con- 

 stricted near the middle, with a large setiferous tubercle on the inside ; the constriction may represent an obsolete 

 articulation, and thus the basal joint really represents the two basal joints of the other legs. The smaller multiarticu- 

 late extremity of theleg is composed of four well-marked joints, the basal as long as the three terminal ones without 

 the claw, which is long and slender aud nearly as well developed as in the other legs. 



The male genital armature is well developed, nearly as much so as in the Julidae. There is a median very long 

 curved forked chitinous rod, a pair of median boot-shaped pieces, and a pair of lateral double blades or pseudorhab- 



