60 bulletin: museum of comparative zoology. 



posterior regions the impression is a simple linear furrow, the arms 

 being quite obliterated. Paired dorsal sulci beginning on the basal 

 plate and present on tergites from there caudad. Last ventral plate 

 rather broad, trapeziform, the caudal margin rounded. Coxopleurae 

 scarcely encroaching on preceding segment; pores fine and numerous. 

 Last dorsal plate long and narrow, caudally rounded. 



Pairs of legs, forty-nine. 



Length, about 27 mm. 



137. Mecistocephalus erythroceps, sp. nov. 



Type.— M. C. Z. 1,906. Paratype.— M. C. Z. 1,907, 1,914. 

 Fijis: Nadarivatu, Levuka (W. M. Mann). 



As compared with M. nigriceps or punctifrons this is a decidedly 

 more slender species of nearly uniform width over the anterior half, 

 the posterior region attenuated. It is a much paler species, the body 

 in general being uniform light yellow, the head and prosternum with 

 prehensors reddish, the first tergite paler. The head with a pair of 

 short longitudinal sulci in front of caudal margin, the plate in front 

 of this with weak puncta not forming well-marked lines as in nigriceps. 

 Labrum with mesal angles of lateral pieces rounded, not at all produced, 

 their margins wholly smooth. Dorsal plates clearly bisulcate from 

 the first inclusive caudad. None roughened, tuberculate or scabrous. 

 Median sulcus of ventral plates sharply defined, bifurcation anteriorly 

 obscure as in nigriceps. Last ventral plate proportionately wider 

 than in nigriceps, not laterally emarginate, surface of uniform char- 

 acter, caudal margin rounded. Last tergite proportionately narrower 

 than in nigriceps, not shield-shaped, sides more weakly convex. Non- 

 porigerous ventral region of coxopleurae wide, oblanceolate. 



Pairs of legs, fifty-one. 



Length, to 31 mm. 



138. Mecistocephalus kurandanus, sp. nov. 



Type.— M. C. Z. 2,066. Queensland: Kuranda (Wm. M. 

 Wheeler) . 



This species is easily distinguished from all others known in the 

 character of the labrum. The lateral pieces have the margin wholly 

 lacking cilia; but the mesal end of each is conspicuously crenate, the 

 most mesal of the seven or eight crenations of each piece being more 



