7o 



W. A. SANDS 





Left mandible, first to third mar- 





ginal (LO .... 



016 



Left mandible, third marginal to 





molar (L m ) .... 



008-0-09 



Right mandible, apical to first mar- 





ginal (R A ) .... 



010-01 1 



Right mandible, first to second 





marginal (Ri) .... 



011-012 



Right mandible, second marginal 





to molar (R m ) 



0-08 



Mesonotum width (M) . 



0-29-0-36 



Metanotum width (N) . 



0-31-0-38 



Worker. Head capsule yellow-white, pilosity pale yellow, very sparse and fine. Postclypeus 

 moderately inflated, Pcl/W, 027, Pcl/Ri, 3-08; apical teeth of mandibles moderately long, 

 La/Li, 0-75, Ra/Ri, i-o8; subsidiary marginal tooth of left mandible separated from molar 

 prominence by distinct notch in surface view, complex ratio LA/Li.L m , 1495; apical and 

 marginal teeth of right mandible approximately in line, anterior margins of first and second 

 marginals equal, Ra/Ri-Riti. 19-10. Fore tibia scarcely inflated, Ti/T w , 4-52, third apical spur 

 distinct though smaller than other two. Mesenteric junction with proctodeum almost trans- 

 verse, to right of malpighian knot; enteric valve seating ventrolateral in unopened abdomen, 

 prominently three-lobed, third lobe almost equal in size to outer two, connected to second 

 pouch of proctodeum by moderately long neck; membranous wall of valve beyond cushions 

 with sparse minute spicules. 



Measurements (one specimen) in millimetres. 



Head width (W) . . . .0-91 



Fore tibia width (T w ) . . . .0-14 



Fore tibia length (Ti) .... 0-65 

 Postclypeus length (Pel) . . .0-25 



Left mandible, apical to first marginal (La) o-io 

 Left mandible, first to third marginal (Lj) . 013 

 Left mandible, third marginal to molar 



(L m ) 0-05 



Right mandible, apical to first marginal 



(Ra) 009 



Right mandible, first to second marginal 



(Ri) 0-08 



Right mandible, second marginal to molar 



(R m ) 0-06 



The Astalotermes species of Group II are not so clearly separable from other genera 

 as Group I. A. aganus is based on a single nest-series which was at first included 

 in A. empodius sp. n. It differs in the proportions of the mandibles, particularly 

 the subsidiary marginal tooth of the left, and in the imago in having smaller ocelli 

 further from the compound eyes; in addition the meso- and metanota are wider 

 at the constriction. In the worker caste, the gut of A . aganus is shorter, the enteric 

 valve seating being nearly ventral, and necked, instead of dorsolateral and nearly 

 sessile as in A . empodius, which also has a very small third apical spur on the fore 

 tibia. The differences in the proportions of the ocelli and mandibles were sharply 

 pointed up by the principal component scores and the wide separation of the species 



