42 BULLETIN 168, UNITED STATES NATIONAL MUSEUM 



apically, untoothed, with a pair of inner lamellae. Claws of first pair 

 of feet smaller tlian the others, Tenent hairs absent. Furcula 

 appended to the fifth abdominal segment, extending to the ventral 

 tube. Manubrium stout, longer than dens (as 11:7), with many stiff 

 dorsal setae and without ventral setae. Dcntes (pi. 13, fig. 136) 

 stout, not tapering, with many strong dorsal setae, with five long 

 subapical setae, two of which are ventral, and with several large 

 rounded dorsal tubercles. Mucro (pi. 13, fig. 136; pi. 14, fig. 137) not 

 quite one-half so long as dentes, bidentate, with narrow inner and 

 outer lamellae extending from the base of the mucro to the anteapical 

 tooth. Rami of tenaculum quadridentate; corpus with one ventral 

 seta (occasionally two, one above the other). Clothing (pi. 14, 

 fig. 138) of dense simple setae, sUghtly longer toward the end of the 

 abdomen; long erect sensory setae absent. Integument smooth. 

 Maximum length, 1 mm. 



Remarks. — This species evidently may occur in enormous numbers. 

 The type material, consisting of thousands of individuals, was in the 

 collection of Prof. F. L. Harvey. It has been collected in Florida bv 

 P. H. Rolfs. 



Coiypes.—V.S.'NM. no. 42988. 



PROISOTOMA (BALUSTURA) LATICAUDA, new spcciea 



Plate 14, Figures 139-14G 



Description. — General color olive-green, the combined effect of dark 

 blue mottlings and pale yellow spots. Body segments narrowl}^ 

 edged posteriorly with blackish. Head with dorsal yellow spots. 

 Legs and furcula pigmented basally; antennae bluish. Body short 

 and stout. Eyes (pi. 14, fig. 139) six on each side, the two inner 

 proximal eyes much smaller than the others. Postantennal organ 

 (pi. 14, fig. 139) subelliptical, tvn.ce as long as broad, two and one-half 

 to three times as long as the diameter of an adjacent eye. Antennae 

 subequal to head in length, with segments in relative lengths about as 

 8:10:13:26. Sense organ of third antennal segment as in plate 14, 

 figure 140. Fourth antennal segment without special olfactory 

 setae. Unguis (pi. 14, fig. 141) stout, curving, with inner margin 

 strongly unidentate two-fifths from the apex. Unguiculus subovate, 

 untoothed, apically produced as a fine filament extending in some 

 specimens almost as far as the opposite claw; inner lamellae two. 

 Hind claws the largest. Tenent hairs absent. Tibiotarsus with a 

 distal subsegment. Third abdominal segment shorter than the 

 fourth (as 5:8). Abdominal segments without ankylosis. Furcula 

 appended to the fifth abdominal segment, just reaching the ventral 

 tube. Manubrium longer than dentes (as 3:2 or 4:3), setigerous 

 dorsally, naked ventrally. Dentes (pi. 14, fig. 142) stout, not rounded 

 apically, subcylindrical, each with two dorsal longitudinal rows of 

 large rounded lobes, about 10 in number; several curving dorsal setae 



