206 bulletin: museum of comparative zoology. 



as is so characteristic of brevilabiatus. Basal and cephalic plates deep 

 ferruginous; prosternum and prehensors ventrally similar but paler, 

 the claws black. Antennae like cephalic plate but pale at their very 

 tips. Venter pale testaceous, darker cephalad. Legs similar to venter. 



Body large and robust; strongly attenuated both cephalad and 

 caudad. Hairs of body very fine and short as are also the few hairs 

 of the legs. 



Cephalic plate conspicuously wider than long, the ratio being about 

 48:39. Widest caudad, where the sides are convex; moderately 

 converging anteriorly in front of the middle to the anterior corners; 

 lateral portions of anterior margin converging from the anterolateral 

 corners to an obtuse angle at the middle; caudal margin widely, 

 weakly con\'ex. Plate with subdense, uniform, fine punctae. Hairs 

 very fine and short, numerous. 



First maxillae with inner division sharply set off; short and broad, 

 apically rounded, not membranous. Outer division with the second 

 and third articles not separated by a suture; short and thick; slightly 

 membranous at tip on mesal side; membranous lappets of moderate 

 length, the distal one wide and rather dorsal in position. Coxae of 

 the second maxillae broadly joined at middle; with the usual oval 

 opening toward the caudal end of each side. Claw of palpus rather 

 small, bearing along each edge a fringe of about nine or ten spines. 



Antennae very short, being but 1.68 times the length of the cephalic 

 plate. Flattened; very wide at base, then strongly narrowed, espe- 

 cially distad of about the proximal fourth. Proximal articles very 

 short, much wider than long, the more distal ones relatively longer; 

 the ultimate article not much differing in length from that of the two 

 preceding ones taken together. Hairs very fine and short, dense 

 distad, becoming less so proximad. 



Prebasal plate not exposed. 



Basal plate embracing the cephalic. Very wide, with sides convex 

 and not strongly converging cephalad ; nearly one half as long as the 

 cephalic plate (ratio about 2.1 : 1), and very nearly three times as wide 

 as long; finely and subdensely punctate like the head. Hairs similar 

 to those of the head but considerably fewer in numl)er. 



Claws of the prehensors when closed very nearly but not wholly 

 attaining the front margin of the cephalic plate; all joints unarmed; 

 claws stout. 



Prosternum much wider than long, the ratio of width to length 

 being 2.25-2.3:1; longer than the outer height of femur in ratio 

 25: 14; subdensely punctate as are also the proximal articles of the 

 prehensors. (Plate 5, fig. 5). 



