TH MYKIAPODA OF NORTH AMERICA. 113 



3. Pectiniunguis americanus, geii. et sp. nov. 



Difn/nonin. Eelated to ftclti'iulyla cximia Meiuert; but the anal pair 

 of legs jointed and the claw of maxillary palpus pectinate along its 

 entire under side. 



Habitat. Piehiliugue Bay, Gulf of California. 



Description. Orange, darkest anteriorly; legs pale. 



Robust, scarcely attenuated anteriorly, more posteriorly. 



Segments not polished, very finely reticulate; sparsely pilose. 



Prehensorial legs not reaching base of anteume; sternum almost 

 twice as wide as long, anterior margin slightly callous; coxte of about 

 equal length and width, unarmed, anterior margin not much sinuate. 



Cephalic plate slightly longer than wide; basal plate three times as 

 wide as long; pre-basal plate exposed. Antenna 1 filiform, rather long. 



Dorsal plate manifestly bisulcate. 



Spiracles suboval, longitudinal, anterior largest. 



Ventral plates not silicate; porous area suboval, much smaller on 

 posterior segments; last ventral plate very wide, pilose, sides con- 

 verging. 



Posterior pleura- large, pilose; pores large, concealed. 



Anal pair of legs 6-jointed, moderately crassate, joints all large, 

 densely pilose; unarmed. 



Pairs of legs 9 <!.~>. 



Length 50 1U1U ; width 1.55""". 



This species is described from an adult female. 



According to Meinert's diagnosis of the genus Ncliemltflit this species 

 would be included under that genus; but the three known species may 

 be separated by the following generic characters: 



. Claw of maxillary palpus not pectinate, outer part of first pair of maxillae without 

 a trace of a lateral process; labrum entirely united, teeth L'O-L'L', equal; anal 

 legs 6-jointed .................................................. XemorniKix. 



art. Claw of maxillary palpus pectinate; outer part of lirst maxilla- with a small 



lateral process; lahriun free in the middle. 



b. Aual pair of legs .Vjointed; elaw of maxillary palpus only pectinate under the 

 apex; labral teeth about !.">, equal; lirst joint of anal legs almost coaleM-e 

 with second ....................................................... Efimia. 



bh. Anal pair of legs G-jointed; claw of maxillary palpus pectinate for its entire 

 length; labral teeth X-j-10+8, the outer enlarged; tirst joint of anal legs not 

 coalesced with second .......................................... imericanus. 



< )n account of these generic differences between the three species, 

 especially between the lirst and the last two, I have thought it best to 

 place aiiio'iciiinis and cxiiniu under the new genus rcctiniuntiiti*, of 

 which timt'rirtniiiN is the type, restricting Si-he ndyhi to ucmorcitxix. 



The generic differences between <iHn-ri<-(tnun and <:rhni are no doubt 

 worthy of subgeneric rank, and I therefore propose the name \<m- 

 for the reception of c.rh 



LMI',17 No. 40 - 8 



