1887.1 .PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 323 



LIST OF THE MYRIAPODS FOUND IN ESCAMBIA COUNTY, FLO- 

 RIDA, WITH DESCRIPTIONS OF SIX NEW SPECIES. 



(With one plate.) 



The Myriapods which fiiriiished the niateii;il for this paper were col- 

 lected by Mr. Charles 11. Bollinan during- the months of March nud 

 April, ISSG, on the shores of Pensacola Bay. The collection contains 

 four hundred specimens, and is in Mr. Bollmau's possession. Six of the 

 species apjiear to be new to science. 



1. Polydesmus bimaculatus, n. sp., P]. xi, figs. 3, 4, and 5. 



Obscure olive or chestnut, the scuta generally marked with an indis- 

 tinct transverse dark band, with lighter color towards the margins; a 

 well-defined oval spot of gray is frequently present on the lateral mar- 

 gins ; lateral laminie with a narrow pink border. 



In the young the color is white with a conspicuous black dorsal band. 

 The color becomes gradually darker as the animal grows, and the band 

 finally becomes indistinct or obsolete. Venter and legs yellow. Head 

 dark except a narrow border around the cephalic margin ; vertex fur- 

 row strongly pronounced and labrum emargiuate. 



Anteunai pilose, especially distad. 



Caudal scuta rapidly contracted. 



Anal scutum prolonged, acute, and apex subtruueate. 



The male appendages consist of two pairs of spines placed on low 

 tumuli, which are sunk below the surrounding surface. 



The larger pair of spines are somewhat twisted and cut distad into 

 two broad, thin processes. 



The caudal surfaces of these spines are completely covered to the 

 furcation with a very long, bushy growth of hair. The second pair of 

 spines are cephalad to the first and spring from their base. This pair 

 is smooth, very slender, acute, and nearly as long as the first pair. 



Length, 34™'".5; width, T™-". 



This description is based upon thirty or more specimens of various 

 ages and both sexes. 



Eabitat.—Veussicol'd, Fla. Mr. Charles H. Bollman. 



This is the common form of Polydesmus. It resembles PoUjdesmus 

 erythropygus in its habits, but differs from it decidedly in form, color, 

 size, and in the genitalia. 



2. Polydesmus varius, n. ep., PI, xi, figs. 1 and 2. 



Varied with red, black, and white, dorsum with a conspicuous mesa! 

 line. 



Each scutum has its caudal half blackish with a white spot on each 

 side of the mesal line ; cephalic half yellow varied with darker color 



