1903.] NATURAL SCIENCES OF PHILADELPHIA. 37 



Spines of the first legs "> Pii-iirlii • of the penult ^^J'jlsjJ'J the claw 



^ ° 0,0,0, 2, l' -^ 0.1,3.3,1' 



armed with a single spine; posterior coxse unarmed beneath or laterally. 



Coxal pores round, 2, 3, 3, 3. 



Genital appendages of male small, wart-like. 



Length of body, 7-8 mm.; width of 10th dorsal plate, .76 mm.; 

 length of antennae, 2.3 mm. 



Remarks. — The description is based upon two males, both of which 

 have lost the anal legs. The general appearance is not unlike that of 

 L. utahensis Chamb., from the mountains of Utah. 



Geophilus atopodon sp. nov. 



Diagnosis. — Frontal plate discrete, last ventral plate narrow; anal 

 pores present, moderately large; pleural pores 10-16 adjacent to ven- 

 tral and dorsal plates ; coxse of prehensorial feet each armed with a stout 

 tooth, the tooth of claw truncate at end; pairs of legs 49-51 (9 ), claw 

 of anal legs long (9 ) ; length, 25 mm. 



Description. — Rather robust, very gradually attenuated cephalad, 

 more abruptly caudad; color uniformly light-brown, the legs the same, 

 the antennse lighter distally. Dorsal plates smooth, sparsely pilose; 

 legs very sparsely pilose; last seven articles of antennae densely pilose 

 with short hairs, the proximal ones more sparsely provided with long 

 hairs ; prosternum and coxse of prehensorial feet finely punctate. 



Antennae short, the ultimate joint reduced distally, shorter than the 

 two preceding taken together. 



Cephalic plate much longer than wide (2.5: 1.9), anterior and pos- 

 terior margins nearly straight, the sides curving, wider in front than 

 behind. Frontal plate discrete, the suture V-shaped in the middle 

 with the point directed backward. Cephahc plate back of suture im- 

 pressed with a strong suture near each lateral margin and with one each 

 side of the median line; a median sulcus extending cephalad in the V- 

 shaped opening of the suture. Prebasal plate concealed. Basal plate 

 as a whole more than twice wnder than long (9:4), exposed portion 

 wider than long in the ratio 9 : 2.25. 



Claws of prehensorial feet when closed scarcely reaching the end of 

 the first antennal article ; claw armed at base with a moderately stout, 

 truncate tooth; coxa armed with a stout tooth which is somewhat 

 longer than that of the claw; prosternum wider than long (12: 10.5), 

 less than twice the height of the coxa, unarmed. 



' Dorsal scuta not sulcate or with a few of the middle ones indis- 

 tinctly bisulcate ; anterior prsescuta short, becoming long or very 

 long in the posterior middle region, the last ones again short. 



