44 W. A. SANDS 



8 Enteric valve cushions in positions 3 and 4, and their armature, much more strongly 



developed than positions 1 and 2 (Text-fig. 19) ...... 9 



- Enteric valve cushion in position 1 elongated and its armature more strongly 



developed than positions 2 3 and 4, which are subequal (Text-fig. 20) 



ATEUCHOTERMES (p. 158) 



9 Enteric valve cushions in position 3 everted, hemispherical, and armed with stout 



spines; position 4 fork-like, with 7-8 curved tines; other positions reduced, 



two with 1-2 spines, one absent (PI. 7) . . . ANAOROTERMES (p. 184) 



- Enteric valve cushions in positions 3 and 4 fringed with stout spines other positions 



smaller with few spines or none (PI. 2) . . . ALYSCOTERMES (p. 125) 



10 Left mandible with proximal end of subsidiary marginal tooth hidden behind molar 



prominence in surface view. Very small, W, 0-48-0-57 ACIDNOTERMES (p. 44) 



- Left mandible with proximal end of subsidiary marginal tooth clear of molar 



prominence in surface view. Larger, W, 0-58-1-09 . . . . . n 



11 Enteric valve armature consisting of sclerotized spiked coronet-like bands, one 



girdling the middle of each cushion, all equally developed (PI. 7) 



ASAGAROTERMES (p. 187) 



- Enteric valve armature not so . . . . . . . . . . 12 



12 Enteric valve unarmed, cushions with reticulate or scaly surface, single exception 



smaller, W, 0-64-0-69 ........... 13 



- Enteric valve armature, edges of scales on cushion surface each produced into one 



or more small spines or spicules, generally larger, W, 0-70-1-09. ... 15 



13 Apical teeth of mandibles very long, L A /Li, 0-97-1-00, R A /Ri, 1-25-1-29; complex 



ratio L A /L,.L m , 25-81-26-66 .... AGANOTERMES (p. 135) 



- Apical teeth of mandibles shorter, La/Li, 0-43-0-86, R A /Ri, 0-57-1-08; complex 



ratio La/Lj. Lm, 7-25-18-60 .......... 14 



14 Enteric valve seating ventral on left side of unopened abdomen, with two prominent 



bilaterally opposed erect lobes (virtually diverticula) ADYNATOTERMES (p. 102) 



- Enteric valve seating ventro- to dorso-lateral, weakly to prominently 2- or 3-lobed 



but never with erect opposed diverticula . . ASTALOTERMES (p. 51) 



15 Apical teeth of mandibles longer, complex ratios La/Li.L„,, 20-75-22-89, R A /RiR m , 



22-80-30-15. Postclypeus more inflated, Pcl/Ri, 2-57-2-88 



ACHOLOTERMES (p. 139) 



- Apical teeth of mandibles shorter, complex ratios La/Li. L m , 7-47-18-61, Ra/Ri. Rm. 



8-86-21-90. Postclypeus less inflated, Pcl/Ri, 1-65-2-60, only one specimen 

 recorded over 2-4 ASTRA TO TERMES (p. 105) 



ACIDNOTERMES gen. n. 



(Akidnos, Gr., 'Weak, feeble') 

 Type-species: Acidnotermes praus sp. n. 



Imago. Very small, W, 0-57-0-66. Fore tibia with three apical spurs, third well developed, 

 two-thirds length of other two. Apical teeth of mandibles short, L A /Li, 0-50-0-56, Ra/Ri, 

 0-62-0-71; subsidiary marginal tooth of left mandible with proximal end just level with edge 

 of molar prominence in surface view, complex ratio La/Li. Lm, 10-00-14-41. Right mandible 

 with points of apical and marginal teeth in line, but second marginal wide with anterior edge 

 longer than that of first marginal. Meso- and metanota narrow at constriction, M/W, 0-21, 

 transverse dark sutures weak but present. 



Worker. Very small, W, 0-48-0-57. Fore tibia moderately swollen, Ti/T w , 3-46-3-94, 

 with three apical spurs, third nearly as large as other two. Apical teeth of mandibles short, 

 La/Li, 0-48-0-54, Ra/Ri, 0-60-0-68; subsidiary marginal tooth of left mandible with proximal 

 end hidden behind molar prominence in surface view, complex ratio La/Li. L m , 11-55-14-72. 



