526 bulletin: museum of comparative zoology. 



Pairs of legs 47. 

 Length 22 mm. 



Locality. — Mexico: Hidalgo, Pachuca (W. M. Mann). Type, 

 M. C. Z. 1729; one specimen. 



Lestophilus haitiensis, sp. nov. 



Ochraceous, clearer yellow caudad. Head darker, of somewhat 

 chestnut cast. Antennae ochi-aceous. Prosternum and prehensors 

 like head. Venter like dorsum or but little paler. Legs yellow. 



Body slender, a little narrowed cephalad; gradually and conspicu- 

 ously narrowed caudad. 



Anterior margin of head nearly straight or a little arcuate; anterior 

 corners oblique. Caudal margin straight. Head widest just back of 

 frontal region. Sides nearly straight, converging caudad to the 

 widely rounded caudal corners. Head a little constricted at frontal 

 region; L4 times longer than wide. Basal plate largely overlapped 

 by the head, the exposed portion between 5 and 5.5 times wider than 

 long. 



Antennae nearly three times as long as the head plates; stout; 

 moderately attenuated distad. Ultimate article not narrowed distad, 

 apically rounded; about four fifths as long as the two preceding 

 articles taken together. 



Claws of prehensors stout, finely serrulate within proximally; 

 when closed reaching to between proximal and distal end of the second 

 article; armed at base with a stout subconical black tooth which is 

 slightly bent caudad at tip; first distad of the tooth a small dark 

 nodular eminence. Femuroid with a stout, subconical, distally 

 blunt or truncate tooth as usual; also with a small dark protuberance 

 immediately proximad of basal oblique suture. 



Anterior border of prosternum with two distinct nodule-like teeth 

 about as far from each other as each is from the femuroid of the same 

 side. Sides straight, a little converging caudad. Wider than long 

 in ratio 32:29. 



Dorsal plates bisulcate as usual. The anterior ones, at least, also 

 sho^ving a distinct median longitudinal sulcus. A distinct transverse 

 sulcus across plates a little in front of the caudal margin. 



All prescuta short, those of the anterior region especially so. 



First spiracle greatly exceeding the second one in size, subcircular 

 or slightly vertically elongate. All others circular; gradually decreas- 

 ing in size caudad and in the posterior region becoming very small. 



Ventral plates with the usual median longitudinal sulcus and the 

 weaker transverse one. Last ventral plate nari'ow, longer than the 



