THE MYR1AP0DA OP 1 NORTH AMERICA. 113 



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



Diagnosis. — Related to Schendyla eximia Meinert; but the anal pair 

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

 entire under side. 



Type.— No. 598. 



Habitat. — Pichiliugue 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 antennae; sternum almost 

 twice as wide as long, anterior margin slightly callous; coxae 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? filiform, rather long. 



Dorsal plate manifestly bisulcate. 



Spiracles suboval, longitudinal, anterior largest. 



Ventral plates not sulcate; 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 mni ; width 1.55 unh . 



This species is described from an adult female. 



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

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

 be separated by the following generic characters: 



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

 a trace of a lateral process; labruni entirely united, teeth 20-22, equal; anal 

 legS,6-jointed Xemorensis. 



an. Claw of maxillary palpus pectinate; outer part of first maxillae with a small 

 lateral process ; labruni free in the middle. 

 b. Anal pair of legs 5-jointed; claw of maxillary palpus only pectinate under the 

 apex; labial teeth about 15, equal; first joint of anal legs almost coalesce 



with second Eximia. 



bb. Anal pair of legs 6-jointed; claw of maxillary palpus pectinate for its entire 

 length; labral teeth 8-f-10+8, the outer enlarged; first joint of anal legs not 

 coalesced with second imericanus. 



On account of these generic differences between the three species, 

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

 plaee americanus and eximia under the new genus Deetini unguis, of 

 which americanus is the type, restricting Schendyla to nemorensis. 



The generic differences between americanus and eximia are no doubt 

 worthy of subgeneric rank, and I therefore propose the name Nan' 

 nopus for the reception of eximia 



