376 GERALD F. HILL. 



Specimens of soldiers and workers in the South AustraHan Museum from Beverley, 

 W. A., Moorella, C.A., and Leigh Creek, C.A., agree perfectly with co-types of 

 D. perniger, Frogg., and are undoubtedly referable to that species. I have not 

 had an opportunity of examining specimens of Drepanotermes from Kimberley, nor 

 dark-headed forms of the genus from Queensland. 



Drepanotermes rubriceps, Frogg. 



Tcrmcs rubriceps, Froggatt, Proc. Linn. Soc, N.S.W, xxii, 1897, p. 730. 



In an earlier paper (Hill, 1915) I described a de-alated imago under the above name, 

 the determination of the species having been made for me by Mr. Froggatt, from 

 soldiers and workers only. Later, a perfect specimen was secured from the same 

 locahty (Darwin, Northern Territory) and under similar conditions. Recently I 

 have had for examination a series of imagines, soldiers and workers from Tennant's 

 Creek and Leigh Creek, Central Austraha (South Austrahan Museum Collection), 

 which, although not compared with the type soldiers and workers, I consider to be 

 D. rubriceps, Frogg., the type locality of which is McKinley Ranges, Central Australia. 

 A comparison of the winged forms from Darwin with those from Central Australia 

 shows that they are referable to two quite distinct species. The structural differ- 

 ences between the respective soldiers, however, are hardly appreciable. The heads of 

 the Central Austrahan specimens are distinctly lighter than those of the Northern 

 species and there are small differences in the structure of the antennae. 



Fig. 10. Drepanotermes 



rubriceps, Frogg., head 



of imago. 



The following is a description of the imago of this species. The Northern species is 

 described in the preceding pages under D. septentrionalis. 



Imago. — Head very dark brown ; clypeus yellow-ochre ; antennae darker than 

 clypeus, brownish ; trophi and ventral surface antimony yellow ; prothorax yellow- 

 ochre, with brown blotches ; wing-stumps and abdominal tergites argus brown, 

 the former with dark vein bases ; wings brown, radius and branches of the cubitus 

 very dark, costal margin pale. 



Head (fig. 10) large, rounded behind, flat on the summit, clothed with numerous 

 short, fine, pale hairs. Labrum narrow at base, swollen on the sides, rounded in 

 front. Anteclypeus membranous, pointed in front. Postclypeus moderately large, 

 twice as wide as long, convex, rounded behind, truncate in front, sloping on the sides. 

 Fontanelle very small, lanceolate, with anterior end bifurcated. Eyes large, pro- 

 jecting moderately, nearly circular (0-610 x 0-470). Ocelh large, oval, obhque, 

 a little less in length than short diameter (horizontal) of eyes, very close to the eyes, 

 their anterior margin a httle posterior to the anterior margin of eyes. Mandibles with 

 dentition as in D. silvestrii, sp. n. Antennae very long and slender, 16- jointed ; 



