332 Mr. R. V. GhamI.erliii on nei 



Mecistocephalas medius, sp. n. 

 (PI. XT. figs. 5-11.) 



Dorsum fulvous^ of slight ferrugiuous tinge. Legs fulvous. 

 Head and preheusorial segment chestnut. 



Head widest auteriorlvj the sides moderately converging 

 candad, more strongly so adjacent to posterior corners. 

 Anterior margin widely rounded. Posterior margin broad, 

 slightly bowed (PI. XI. fig. 5). Head in type 1'68 times 

 longer than wide. 



Median piece o£ labrum broadly sublanceolate. Anterior 

 margin of lateral pieces, when projected to meet forming a 

 straight line at middle, carving candad of ectad at outer 

 ends. Free margins of lateral pieces concave in ectal 

 region, convex mesad of middle, with mesal angles as shown 

 in PI. XI. fig. 7. Anterior pieces only a little narrower at 

 mesal ends than at tlie ectal. 



Areolated area of clypeus much longer than the non- 

 areolated posterior paired bands. Median dividing band 

 rather wide. Sublateral teeth as shown in PI. XI. fig. 6. 



Mandible with seven hunella3, counting the mucli reduced 

 ectal one. First lamella with five cliaracteristicall}'^ long 

 teeth (PI. XI. fig. 9). iNIedian lamella with about fifteen 

 teeth, all long, the proximal ones more loosely arranged. 



Areolated area o£ coxosternum of second maxillae large, 

 the median band very broad. Pores narrowly subeliiptic. 

 Ectal corners of coxae of first maxillae only slightly elevated, 

 rounded. Setae of maxillae as shown in figure. Distal joint 

 of palpus characteristicallv bluntlv rounded, the claw much 

 reduced (PI. XI. fig. 8). 



Teeth on anterior margin of prosternum very small. 

 Claw of prehensors exceptionally slender, tooth at base 

 prominent. Femuroid with the usual two teeth, of which 

 the distal is the larger and pvojects distad of mesad. The 

 succeeding joint bears no tooth, but the next one bears 

 a prominent tooth at its distal edge, which projects distad 

 of mesad (PI. XI. Hg. 10). 



Impressions of anterior sternites furcate, the blanches 

 forming an obtuse angle (PI. XI. fig. 11). 



Posterior portion of body of type missing, hence the total 

 length and the number of segments cannot be given. 



Width of first tergite 1"2 mm. 



LocalUij. — Solomon Is.: Ngi {W. M. Mann). 



Type in Mus. Comp. Zool. at Cambridge, Mass. 



