chamberlin: myriopoda of the Australian region. 97 



258. SiPHONOTUs attanus, sp. nov. 



Type.— M. C. Z. 4,967 (male). Paratypes.— M. C. Z. 4,968 

 (males and females). Solomons: Atta (W. M. Mann). 



The general color is pale fulvous. Antennae proximally fulvous, the distal 

 articles violaceous, particularly over distal borders. 



The profile of the head furnishes an easy means of distinction between the 

 two species, this in the present one being evenly \\'idely concave between 

 level of gentle upper frontal convexity and lower end of head, sometimes 

 angularly indented near middle of this line. Antennae proportionately more 

 slender with articles relatively longer, the sixth article proportionately longer 

 and only slightly narrowed distad; antennae tj^pically not widening beyond 

 middle from where either subcyUndrical or a little narrowing distad. 



Collum widely depressed across middle; lower margin concave toward 

 caudal end where it curves down making caudolateral angle of plate acute. 



Number of segments (male and female) fifty to fifty-two. 



Length, near 1.3 mm. 



May be recognized among other species of the Solomons by the 

 form of the head. This somewhat resembles that of S. socius but is 

 longer and proportionately more slender, the sides of face less strongly 

 converging ventrad. 



A notably more slender species than S. socius. Segmental sutures 

 distinct but prozonites not sharply depressed, continuing evenly the 

 dorsal line of metazonite, this line decreasing gradually beneath pre- 

 ceding plate. 



259. SiPHONOTUs curticeps, sp. nov. 



Ty-pe.— M. C. Z. 4,964. Paratypes.— M. C. Z. 4,96.5, 4,969. 

 Solomons: Fulakora, Atta (W. M. Mann). 



A smaller, more slender species than the two preceding. Of a 

 somewhat fulvous grey color with antennae dark as usual. 



Strongly characterized by the form and proportions of the head. 

 This is extremely short, with low^er part of face much less acute than 

 usual; the width of face at lower level of antennal sockets greater than 

 the length below this le\'el; in front view side of face typically more 

 or less angled between antennae and lower end; in profile face is 

 prominently convex at junction of vertigial and frontal regions below 

 which it is straight. Antennae clavate, thick, joint short, much 

 exceeding head because of shortness of latter. 



Number of segments in both type and paratype, fifty-four. 



Length, 11.5 mm. 



