MYRIAPODA 75 



lateral sulci. The cephalic lamina is long and narrow, and the basal 

 lamina is also much narrower, being but twice as broad as long, instead 

 of three times, as in Geophilus. The sterna lack the large median 

 depressions, but are marked with three shallow longitudinal grooves. 

 The Harriman Expedition secured this species at Yakutat Bay ; the 

 U. S. National Museum has a specimen from St. Paul Island, Pribilof 

 Islands, collected by T. Kincaid in 1897. The Yakutat Bay material 

 consists of a mature female and several recently hatched young. The 

 female has 47 pairs of legs. 



Genus Geophilus Leach. 



Geophilus Leach, Linn. Trans., XI, p. 384, 181 5. 



A large genus of mostly temperate species, much in need of critical 

 revision. 



GEOPHILUS ALASKANUS sp. nov. 



Type. — No. 793, U. S. Nat. Mus. ; collected by the Harriman Ex- 

 pedition at Sitka, Alaska, June, 1S99 (No. 47) ; a single specimen. 



Length about 30 mm. ; width .75 mm. ; male with 53 segments. 



Color in alcohol rather dull oi-ange brown. 



Cephalic lamina oblong, somewhat longer than broad ; frontal lamina 

 completely coalesced ; prebasal lamina not exposed ; basal lamina 

 broader than the cephalic. 



Prehensorial sternum broader than long ; lateral sulci distinct; pro- 

 sternal teeth obsolete ; coxae unarmed ; claw unarmed at base. 



Dorsal surface naked and smooth, except for two very faint impressed 

 lines. 



Sterna, beginning with the second, with very deep oval median 

 depressions, becoming shallow at the middle of the body and obsolete 

 caudad. 



Last sternum trapezoidal, slightly longer than broad, the lateral 

 edges nearly straight and the posterior margin squarely truncate. 



Pleurae of last segment rather small, marked with S or 10 pigmented 

 pores, of which the posterior one of the ventral face is larger than the 

 others and is sunk in a deep cavity. 



First pair of legs very small ; last pair in male distinctly larger and 

 more robust than the others, but scarcely crassate ; armed with a claw 

 of nearly normal size. 



The deep color of this species suggests Mecistocephalus attenuatus, 

 but the head is distinctly that of a Geophilus. 



