7U6 rnocKKDiNGs of the national museum. 



Fiist segment HCJircely more tluin twice as broail -ah long; posti'iior 

 mnij^iii (liHtiiictly aiid broadly emargiiiate in <he iiii(l<lle, laterally 

 directed obliquely (teplialad ; anterior margin transverse or very slightly 

 emargiiiate modianly, moi-c stiougly so laterally o])]i()sito the antennal 

 sockets, and converging toward tlie ])()sterior margin by considerably 

 less than a right angle; as a whole the anterior margin would b(^ 

 nearly transverse if the body were extended in a straight line, while 

 the posterior curves forward to meet it at a small angles, as mentioned 

 above. There is thus no latcMal margin ])roi»<!r, and the lateral corner 

 is i)roduced ventrad considerably below the line of the other carina*, a 

 condition not observed in the other genera of the family. Lateral cal- 

 lus not strongly thickened, but well defined, subtriangular in shajie, 

 occupying tlu^ extreme corner of the carina and continued along the 

 anterior and i)osterior edges as a line raised margin, more distinct on 

 the anterior edge, but not loaching the middle. 



yecond segment with the (carina' laterally ])rodu(!cd beyond the level 

 of the third; anterior edge distinctly margined; ])08terior loss so; the 

 marginal callus on this segiiuMit and the two following is as broad as 

 that of the fifth segment. 



Segments dorsally strongly ])olished and shining, minutely ])unctu- 

 iate under a lens; ]>osterior segments riigulose latei-ad inside the mar- 

 ginal callus. 



Lateral carina' Strongly margined in front, distinctly, though less 

 strongly, behind; the marginal callus is not abruptly narrowed in front 

 of thei)ore as on the anterior segments of Aulodesmns, but tapers grad- 

 ually into the narrow margin. 



Ikcpugnatorial pores located iu deep, circular excavations half as wide 

 as the marginal callus. 



Lelow the carina' the segments are (inely rugulose; the secondary 

 carina' slight, liiiely gi'anulated. 



Anterior subs'egments minutely striolate and rugulose longitudinally, 

 distinctly rouglier under a lens than the ])osterior subsegments; tians- 

 verse constriction distinct, polished, (inely crenulate. 



I'enultimate segment not greatly shortened, the apices of its carinas 

 slightly exceeding those of segment 18. 



Last segment with triangular apical portion truncate, slightly tilted 

 up; the setifc^rous i)unctations located in slightly ])rominent rings. 



Anal valves rather strongly rugiilosestriate below; setiferous tuber- 

 cles small, distinct, the lower pair separated from the margin. 



Preanal scale nearly smooth, nearly somiiiircular, minutely apiculate, 

 the setiferous tubucles enormously enlarged, suggesting those of Imv- 

 nodcsmiis JIabellatiiN of the family Oxydesmida'. 



Sterna finely coriaceous, sparsely hirsute along the ])08terior slope, 

 otherwise naked. 



Process of sixth segment hirsute distad on its j^osterior face; the 

 shape of the process would be uearly square but ibr the triangular 

 apiculus. 



