THE MYRIAPODA OF NORTH AMKRICA. 180 



and lifdclniciihe has none, but until a satisfactory examination can bo 

 made of the eyes, it is not best to rank ajiy even as subjjenera. 



The 80-callt'd vitreous oceibis of Plnfytlesmim seems to me to be noth- 

 intr but a sliglit swelling of the head behind the antenna". This },fenus 

 contains the following,' species: 



Platydesmus lecoiitii. 



Brachyeiihc hroutii Wood. Vroc. Pbila. Arad. Nat. Sci., 187, 18(U {(irorgia)', Wood, 



Trans. Anu-r. riiil. Soc., 230, 1865. 

 Iir<i<h>ir;ihc liTonlvi Vt>\Hi. Trans. Aiikt. F.nt. Sf)c., «»6, \><70 {Jifffrxou f'o., Ti init'sstc). 

 riatiidiHmux Itcoiitri Bolluian. Ent. Auior., 1, 1888 (Little L'ock, Arkiinsas); McNeill, 



Hnll. Brook. Hoc. Nat. Hist.. No. 3, 1, 1888. 

 lirachin'tjhf roseii Murray. Econ. Ent. Aptera, 21, 1877 {California), 

 riatiidfsmiis rosia McNi.ll. Bnll. Brook. Soc Nat. Hist., No. 3, 1, 1888. 

 riafildexmiis caHfurnicui Karsch. .Mittlu'il. Miinch. Knt. Ver., lit, IXXO ( California). 



Sejiinents rosy, witli the lateral carina* paler; le<;s, antenna^ and 

 head principally yellow. Segments 35-.'5."»; tirst row of tubercles near 

 the anterior inaigin along- the middle of segment, but ending at the 

 repugnatorial pore; second row arranged along posterior margin of 

 segment. Lateral carina' rounded or slightly irregular in outline. 



IJepugnatorial pore small; swelling small, i)laced near the mid- 

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

 tubercles. j\Iale: Anterior i>air of legs scarcely larger than the rest; 

 claws normal. Anterior copulation foot <)-jointed, rather abruptly 

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

 bent in between the first, G-jointed, ending in four or live long and stitif 

 bristles. Length of body, 8-1*1""". 



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

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

 ray and Karsch). 



I have been unable to find any differences between P. lecontei and 

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

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

 ble to identify his s})ecies with any of the others. 



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

 ern forms mav reveal some differences. 



