THE FAMILY GOMPHODESMIDM-^COOK. 701 



larly shaped node, which, bears a long spine on its median face and a 

 shorter one on its lateral, both directed distad; from the anterior (by 

 flexure posterior) face of the node rises a simple flagellnm, which 

 describes a subelliptic curve and has its base and a])ex: protected by 

 the smaller and larger spine, respectively. 



OMODESMUS OXYGONUS (Peters). 

 (Plate LVII, figs. 2a,2e.) 



Eurydeamus oxygonus Peters, Reise nach Mossambique, Zoologie, 1862, V, p. 535. 

 Aulodesmua oxyyonns Cook, Proc. U. S. Nat. Mus., 1895, XVIII, p. 89, pi. iii, figs. 

 10-14; pi. VI, figs. 4-7. 



Vertex without hairs, smooth and even; sulcus distinct, not connected 

 below with the antennal sulcus; about midway between the lower end 

 of the sulcus and the antennal sockets is a distinct setiferous (?) 

 punctation. 



Clypeus not hirsute, even; lateral excavations shallow; punctations 

 of the lower part obscure; above with a pair of small, distinct puncta- 

 tions somewhat wider apart than those mentioned in the preceding 

 paragraph and half as far from them as from each other. 



Antenmc lost. 



Gnathochilariura densely hirsute, shaped, as far as can be seen, as in 

 Astrodefimiis stellifer. 



First segment (jonvex in front and behind, distinctly margined on the 

 anterior corners and thickened on the posterior. 



Segments dorsally finely coriaceous and somewhat rugulose, the 

 wrinkles being most j)ronounced at the anteiior shoulder of the carin:e, 

 from which they extend obliquely caudad and mesad; three rows of 

 very indistinct and small tubercles; these are scarcely prominent and 

 are indicated mostly by small spots of darker color, finer and closer 

 together on the i)OSterior segments. 



Lateral cariuiTe margined in front and behind, the lateral margin 

 strongly thickened and convex; all the margins smooth and shining; 

 on the second .Segment the posterior corner is nearly a right angle, while 

 on all others it is produced caudad, increasingly so on the middle and 

 posterior segments. 



Kepugnatorial pores facing dorsad and laterad, located slightly in 

 front of the middle of the thickened margin, though on posterior seg- 

 ment, by reason of the posterior production of the carinse, they are 

 nearly on aline with the posterior margin of the segments. 



Below the carinas the segments are densely rugulose longitudinally, 

 with occasional scattering prominences. 



Anterior subsegmeuts even and shining, marked with very short and 

 fine iinpressedlinesorstriations; transverse constriction distinct though 

 not deep, polished, faintly crenulate. 



Penultimate segment very short, the exposed part equal to less than 



