—3— 



plntos witli posterior angles prockiced, especially posteriorly ; lateral margins three 

 or four toothed, indistinct posteriorly, tubercles distinct, arranged in two rows of four 

 each, anterior border indistinctly div'ded into two, po.-teiiorly, the last row of tub- 

 ercles project beyond border of segments. Legs long, crassaie in male. 



Male : copulation foot very simi ar to .wrrciius ; ventral plates produced into a 

 short, pilose lobe anteiioily. 



Length of body lo — 14 mm., \\!tl;h 1.5 1.8 mm. 



Hab.— Little Rock. 



This species is described from a number of specimens found in the 

 low lands, south of Little Rock. 



14. Polydesmus pinetorum, sp. nov. 



Very similar to P. serratus, but the general color paler and sizj smaller. 

 Tuberculation not So tlistinct, sides ot first segment i toothed, other distinctly 3 or 

 4 ioo;hed. La>t row ol scales on posterior segments composed of six or eight setae 

 tipped scale-, which project beyond border of Segments. Veniral plate of ninth pair 

 of legs not produced as in scrraius, copulation foot vei'y similar. 



Length of body 15 to 18.5 mm.; width 2.2 to 2.8 mm. 



Hab.— LittL- Rock, Arkadclphia, Okolona, Alurfree-b j;o, and Ultima Thiile. 



As already indicated, this species is closely related to serrahis. It is 

 principally separated by its smaller size and form of the ventral of ninth 

 pair of legs of male. 



Fhis species may only represent a geographical form o{ serrahis. It 

 is very abundant throughout the state, and all those collected during the 

 su'umer were in the larva stages. I am indebted lu ]Mr. Hutcherson for 

 adult specimens. 



15 Fontaria virginiensis (Drury). 



Abundant at Donaldson, common at Okolona. 



Specimens from Arkansas are similar 10 those from North Carolina, 

 but those from northern parts of Mississippi valley represent geographical 

 species. 



At Donaldson the adults were found crawling on the surface of the 

 ground in company with a large number of their young, probably one 

 adult to five or eight hundred young, then (Jul_\- 11, 1887) about half 

 grown. 



This species seems to be more confined to river bottoms, and low 

 rich woodlands. 



The odor of prussic acid is strongly emitted by this species through 

 a series of pores on each side of the body. 



16. Sphseriodesmus pudicus sp. nov. 



General color pinkish, especially posteriorly, anterior half of segments darkest, 

 a black median dorsal line, antennoe dark, legs pale. Body widest and highest an- 

 teriorly, tapering posteriorly, smooth, setce absent. Vertex smooth, somewhat sul- 

 cate. AntenniE subclavate, about equalling width of body. Dorsal plates smooth, 

 tour preceding the last with an indistinct row of obtuse scales ; lateral plates except 



