512 bulletin: museum of comparative zoology. 



Anal leg with six joints distad of the coxopleurae. Unarmed or 

 with obscure trace of claw. Not long. 



Genotype. — M. latus, sp. nov. 



This genus corresponds in part to Polycricus as used by Cook but 

 does not embrace the type of that genus (P. toltecus) as given by its 

 authors, Humbert and Saussure. In addition to the genotype, Nesidi- 

 phihis includes N. viontis, sp. nov., N. nicaraguae, sp. nov. and N . 

 marginalis (Meinert), Polycricus floridanus Cook being a synonym of 

 the last mentioned species. 



Nesidiphilus latus, sp. nov. 



Dorsum rather dark brown with anteriorh- a black median stripe 

 which posteriorly becomes geminate and may be there indistinct; 

 margins of plates and pleural sclerites may be mottled with purplish 

 much as in marginalis. Head typically of a chestnut cast. Antennae 

 brown, somewhat paler at tips. Prosternum and prehensors like 

 head. Venter a lighter brown than the dorsum. Legs testaceous. 



Body broad, robust; strongly narrowed from the middle caudad 

 but only moderately narrowing cephalad to the head. 



Head with place of suture taken by a pale line from the level of 

 which cephalad the head is somewhat constricted. Anterior margin 

 convex, the part between bases of antennae straight or a little concave. 

 Head distinctly narrowing from near frontal region caudad to caudal 

 region where the sides convexly round in and converge to the straight 

 caudal margin. Nearly two thirds as wide as long (ratio in type 

 60:97). Basal plate 3.45 times wider than long; coarsely punctate. 



Antennae short being only about 2.33 times longer than the head. 

 Ultimate article scarcely narrowed distad, apically well rounded; 

 three fourths as long as the two preceding ones taken together. 



Claws of prehensors when closed reaching to between proximal and 

 distal ends of second article of antennae. Claws stout, proximally 

 serrulate or finely crenulate on mesal side; armed at base with a 

 stout conical black tooth and distad of this showing a dark low emi- 

 nence. Femuroid distally with a stout well-rounded nodular process 

 which is pale. Other articles unarmed. 



Sinus of prosternum semicircular, shallow; a low dark nodular 

 eminence or tooth on each side of it. Sides a little converging caudad, 

 at middle of length very slightly incurved. Free portion nearly 

 1.2 times longer than greatest length ; 1.7 times longer than greatest 

 length of femuroid. Subdensely punctate. 



Dorsal plates deeply bisulcate; the anterior ones showing also a 



