THE MYRIAPODA OF NORTH AMERICA. 189 



and Brachycybe has none, but until a satisfactory examination can be 

 made of the eyes, it is not best to rank any even as subgenera. 



The so-called vitreous ocellus of Platydexmus seems to me to be noth- 

 ing' but a slight swelling of the head behind the antenme. This genus 

 contains the following species : 



Platydesinus lecoutii. 



Brachycybe lerontii Wood. Proc. Phila. Acatl. Nat. Sci., 187, 1864 (Georgia); Wood, 



Trans. Ainer. Phil. Soc., 230, 1865. 



Braclii/tybe leant tii ('ope. Trails. Amer. Ent. .Soc., 66, 1870 (Jefferson Co., Tennessee), 

 ritttt/dt'sniux Icrontfl Bollmau. Ent. Amer., 1, 1888 (Little Rock, Arkansas); McNeill, 

 Bull. Brook. Soc. Nat. Hist., No. 3, 4, 1888. 



rosea Murray. Ecou. Ent. Aptera, 21, 1877 (California). 



r<>*ca McNiell. Bull. Brook. Soc. Nat. Hist., No. 3, 4, 1888. 

 1'liiti/ilt'xnnin i-iilifornicus Karsch. Mitthcil. Miiuch. Ent. Ver., 144, 1880 (California). 



Segments rosy, with the lateral carime paler; legs, antenna 1 , and 

 head principally yellow. Segments 35-55; first row of tubercles near 

 the anterior margin along the middle of segment, but ending at the 

 repugnatorial pore; second row arranged along posterior margin of 

 segment. Lateral carinse rounded or slightly irregular in outline. 



Kepugnatorial pore small; swelling small, placed near the mid- 

 dle and slightly sinuate. Anal segment armed with 4-8 setigerous 

 tubercles. Male: Anterior pair of legs scarcely larger than the rest; 

 claws normal. Anterior copulation foot G-jointed, rather abruptly 

 curved downwards and ending in a small claw; second copulation foot 

 bent in between the first, 6-jointed, ending in four or five long and stiff 

 bristles. Length of body, 8-21 mni . 



Habitat. Tallulah, Georgia ; Little Rock and Magnet, Arkansas ; Geor- 

 gia (Wood); Jefferson County, Tennessee (Cope); California (Mur- 

 ray and Karsch). 



1 have been unable to find any differences between P. lecontd and 

 rosea or valifornicus; especially Karsch's description of the latter, for 

 Murray's description of rosca is so meager that it is almost impossi- 

 ble to identify his species with any of the others. 



A careful study of the male copulation loot of the Eastern and West- 

 ern forms may reveal some differences. 



